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{\n  setFillingCmykColor,\n  setFillingGrayscaleColor,\n  setFillingRgbColor,\n  setStrokingCmykColor,\n  setStrokingGrayscaleColor,\n  setStrokingRgbColor,\n} from 'src/api/operators';\nimport { assertRange, error } from 'src/utils';\n\nexport enum ColorTypes {\n  Grayscale = 'Grayscale',\n  RGB = 'RGB',\n  CMYK = 'CMYK',\n}\n\nexport interface Grayscale {\n  type: ColorTypes.Grayscale;\n  gray: number;\n}\n\nexport interface RGB {\n  type: ColorTypes.RGB;\n  red: number;\n  green: number;\n  blue: number;\n}\n\nexport interface CMYK {\n  type: ColorTypes.CMYK;\n  cyan: number;\n  magenta: number;\n  yellow: number;\n  key: number;\n}\n\nexport type Color = Grayscale | RGB | CMYK;\n\nexport const grayscale = (gray: number): Grayscale => {\n  assertRange(gray, 'gray', 0.0, 1.0);\n  return { type: ColorTypes.Grayscale, gray };\n};\n\nexport const rgb = (red: number, green: number, blue: number): RGB => {\n  assertRange(red, 'red', 0, 1);\n  assertRange(green, 'green', 0, 1);\n  assertRange(blue, 'blue', 0, 1);\n  return { type: ColorTypes.RGB, red, green, blue };\n};\n\nexport const cmyk = (\n  cyan: number,\n  magenta: number,\n  yellow: number,\n  key: number,\n): CMYK => {\n  assertRange(cyan, 'cyan', 0, 1);\n  assertRange(magenta, 'magenta', 0, 1);\n  assertRange(yellow, 'yellow', 0, 1);\n  assertRange(key, 'key', 0, 1);\n  return { type: ColorTypes.CMYK, cyan, magenta, yellow, key };\n};\n\nconst { Grayscale, RGB, CMYK } = ColorTypes;\n\n// prettier-ignore\nexport const setFillingColor = (color: Color) => \n    color.type === Grayscale ? setFillingGrayscaleColor(color.gray)\n  : color.type === RGB       ? setFillingRgbColor(color.red, color.green, color.blue)\n  : color.type === CMYK      ? setFillingCmykColor(color.cyan, color.magenta, color.yellow, color.key)\n  : error(`Invalid color: ${JSON.stringify(color)}`);\n\n// prettier-ignore\nexport const setStrokingColor = (color: Color) => \n    color.type === Grayscale ? setStrokingGrayscaleColor(color.gray)\n  : color.type === RGB       ? setStrokingRgbColor(color.red, color.green, color.blue)\n  : color.type === CMYK      ? setStrokingCmykColor(color.cyan, color.magenta, color.yellow, color.key)\n  : error(`Invalid color: ${JSON.stringify(color)}`);\n\n// prettier-ignore\nexport const componentsToColor = (comps?: number[], scale = 1) => (\n    comps?.length === 1 ? grayscale(\n      comps[0] * scale,\n    )\n  : comps?.length === 3 ? rgb(\n      comps[0] * scale, \n      comps[1] * scale, \n      comps[2] * scale,\n    )\n  : comps?.length === 4 ? cmyk(\n      comps[0] * scale, \n      comps[1] * scale, \n      comps[2] * scale, \n      comps[3] * scale,\n    )\n  : undefined\n);\n\n// prettier-ignore\nexport const colorToComponents = (color: Color) =>\n    color.type === Grayscale ? [color.gray]\n  : color.type === RGB       ? [color.red, color.green, color.blue]\n  : color.type === CMYK      ? [color.cyan, color.magenta, color.yellow, color.key]\n  : error(`Invalid color: ${JSON.stringify(color)}`);\n","// tslint:disable: max-classes-per-file\n\n// TODO: Include link to documentation with example\nexport class EncryptedPDFError extends Error {\n  constructor() {\n    const msg =\n      'Input document to `PDFDocument.load` is encrypted. You can use `PDFDocument.load(..., { ignoreEncryption: true })` if you wish to load the document anyways.';\n    super(msg);\n  }\n}\n\n// TODO: Include link to documentation with example\nexport class FontkitNotRegisteredError extends Error {\n  constructor() {\n    const msg =\n      'Input to `PDFDocument.embedFont` was a custom font, but no `fontkit` instance was found. You must register a `fontkit` instance with `PDFDocument.registerFontkit(...)` before embedding custom fonts.';\n    super(msg);\n  }\n}\n\n// TODO: Include link to documentation with example\nexport class ForeignPageError extends Error {\n  constructor() {\n    const msg =\n      'A `page` passed to `PDFDocument.addPage` or `PDFDocument.insertPage` was from a different (foreign) PDF document. If you want to copy pages from one PDFDocument to another, you must use `PDFDocument.copyPages(...)` to copy the pages before adding or inserting them.';\n    super(msg);\n  }\n}\n\n// TODO: Include link to documentation with example\nexport class RemovePageFromEmptyDocumentError extends Error {\n  constructor() {\n    const msg =\n      'PDFDocument has no pages so `PDFDocument.removePage` cannot be called';\n    super(msg);\n  }\n}\n\nexport class NoSuchFieldError extends Error {\n  constructor(name: string) {\n    const msg = `PDFDocument has no form field with the name \"${name}\"`;\n    super(msg);\n  }\n}\n\nexport class UnexpectedFieldTypeError extends Error {\n  constructor(name: string, expected: any, actual: any) {\n    const expectedType = expected?.name;\n    const actualType = actual?.constructor?.name ?? actual;\n    const msg =\n      `Expected field \"${name}\" to be of type ${expectedType}, ` +\n      `but it is actually of type ${actualType}`;\n    super(msg);\n  }\n}\n\nexport class MissingOnValueCheckError extends Error {\n  constructor(onValue: any) {\n    const msg = `Failed to select check box due to missing onValue: \"${onValue}\"`;\n    super(msg);\n  }\n}\n\nexport class FieldAlreadyExistsError extends Error {\n  constructor(name: string) {\n    const msg = `A field already exists with the specified name: \"${name}\"`;\n    super(msg);\n  }\n}\n\nexport class InvalidFieldNamePartError extends Error {\n  constructor(namePart: string) {\n    const msg = `Field name contains invalid component: \"${namePart}\"`;\n    super(msg);\n  }\n}\n\nexport class FieldExistsAsNonTerminalError extends Error {\n  constructor(name: string) {\n    const msg = `A non-terminal field already exists with the specified name: \"${name}\"`;\n    super(msg);\n  }\n}\n\nexport class RichTextFieldReadError extends Error {\n  constructor(fieldName: string) {\n    const msg = `Reading rich text fields is not supported: Attempted to read rich text field: ${fieldName}`;\n    super(msg);\n  }\n}\n\nexport class CombedTextLayoutError extends Error {\n  constructor(lineLength: number, cellCount: number) {\n    const msg = `Failed to layout combed text as lineLength=${lineLength} is greater than cellCount=${cellCount}`;\n    super(msg);\n  }\n}\n\nexport class ExceededMaxLengthError extends Error {\n  constructor(textLength: number, maxLength: number, name: string) {\n    const msg = `Attempted to set text with length=${textLength} for TextField with maxLength=${maxLength} and name=${name}`;\n    super(msg);\n  }\n}\n\nexport class InvalidMaxLengthError extends Error {\n  constructor(textLength: number, maxLength: number, name: string) {\n    const msg = `Attempted to set maxLength=${maxLength}, which is less than ${textLength}, the length of this field's current value (name=${name})`;\n    super(msg);\n  }\n}\n","import PDFDocument from 'src/api/PDFDocument';\nimport PDFPage from 'src/api/PDFPage';\nimport PDFFont from 'src/api/PDFFont';\nimport PDFImage from 'src/api/PDFImage';\nimport { ImageAlignment } from 'src/api/image/alignment';\nimport {\n  AppearanceProviderFor,\n  normalizeAppearance,\n  defaultButtonAppearanceProvider,\n} from 'src/api/form/appearances';\nimport PDFField, {\n  FieldAppearanceOptions,\n  assertFieldAppearanceOptions,\n} from 'src/api/form/PDFField';\nimport { rgb } from 'src/api/colors';\nimport { degrees } from 'src/api/rotations';\n\nimport {\n  PDFRef,\n  PDFStream,\n  PDFAcroPushButton,\n  PDFWidgetAnnotation,\n} from 'src/core';\nimport { assertIs, assertOrUndefined, assertPositive } from 'src/utils';\n\n/**\n * Represents a button field of a [[PDFForm]].\n *\n * [[PDFButton]] fields are interactive controls that users can click with their\n * mouse. This type of [[PDFField]] is not stateful. The purpose of a button\n * is to perform an action when the user clicks on it, such as opening a print\n * modal or resetting the form. Buttons are typically rectangular in shape and\n * have a text label describing the action that they perform when clicked.\n */\nexport default class PDFButton extends PDFField {\n  /**\n   * > **NOTE:** You probably don't want to call this method directly. Instead,\n   * > consider using the [[PDFForm.getButton]] method, which will create an\n   * > instance of [[PDFButton]] for you.\n   *\n   * Create an instance of [[PDFButton]] from an existing acroPushButton and ref\n   *\n   * @param acroPushButton The underlying `PDFAcroPushButton` for this button.\n   * @param ref The unique reference for this button.\n   * @param doc The document to which this button will belong.\n   */\n  static of = (\n    acroPushButton: PDFAcroPushButton,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) => new PDFButton(acroPushButton, ref, doc);\n\n  /** The low-level PDFAcroPushButton wrapped by this button. */\n  readonly acroField: PDFAcroPushButton;\n\n  private constructor(\n    acroPushButton: PDFAcroPushButton,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) {\n    super(acroPushButton, ref, doc);\n\n    assertIs(acroPushButton, 'acroButton', [\n      [PDFAcroPushButton, 'PDFAcroPushButton'],\n    ]);\n\n    this.acroField = acroPushButton;\n  }\n\n  /**\n   * Display an image inside the bounds of this button's widgets. For example:\n   * ```js\n   * const pngImage = await pdfDoc.embedPng(...)\n   * const button = form.getButton('some.button.field')\n   * button.setImage(pngImage, ImageAlignment.Center)\n   * ```\n   * This will update the appearances streams for each of this button's widgets.\n   * @param image The image that should be displayed.\n   * @param alignment The alignment of the image.\n   */\n  setImage(image: PDFImage, alignment = ImageAlignment.Center) {\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const streamRef = this.createImageAppearanceStream(\n        widget,\n        image,\n        alignment,\n      );\n      this.updateWidgetAppearances(widget, { normal: streamRef });\n    }\n\n    this.markAsClean();\n  }\n\n  /**\n   * Set the font size for this field. Larger font sizes will result in larger\n   * text being displayed when PDF readers render this button. Font sizes may\n   * be integer or floating point numbers. Supplying a negative font size will\n   * cause this method to throw an error.\n   *\n   * For example:\n   * ```js\n   * const button = form.getButton('some.button.field')\n   * button.setFontSize(4)\n   * button.setFontSize(15.7)\n   * ```\n   *\n   * > This method depends upon the existence of a default appearance\n   * > (`/DA`) string. If this field does not have a default appearance string,\n   * > or that string does not contain a font size (via the `Tf` operator),\n   * > then this method will throw an error.\n   *\n   * @param fontSize The font size to be used when rendering text in this field.\n   */\n  setFontSize(fontSize: number) {\n    assertPositive(fontSize, 'fontSize');\n    this.acroField.setFontSize(fontSize);\n    this.markAsDirty();\n  }\n\n  /**\n   * Show this button on the specified page with the given text. For example:\n   * ```js\n   * const ubuntuFont = await pdfDoc.embedFont(ubuntuFontBytes)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const button = form.createButton('some.button.field')\n   *\n   * button.addToPage('Do Stuff', page, {\n   *   x: 50,\n   *   y: 75,\n   *   width: 200,\n   *   height: 100,\n   *   textColor: rgb(1, 0, 0),\n   *   backgroundColor: rgb(0, 1, 0),\n   *   borderColor: rgb(0, 0, 1),\n   *   borderWidth: 2,\n   *   rotate: degrees(90),\n   *   font: ubuntuFont,\n   * })\n   * ```\n   * This will create a new widget for this button field.\n   * @param text The text to be displayed for this button widget.\n   * @param page The page to which this button widget should be added.\n   * @param options The options to be used when adding this button widget.\n   */\n  addToPage(\n    // TODO: This needs to be optional, e.g. for image buttons\n    text: string,\n    page: PDFPage,\n    options?: FieldAppearanceOptions,\n  ) {\n    assertOrUndefined(text, 'text', ['string']);\n    assertOrUndefined(page, 'page', [[PDFPage, 'PDFPage']]);\n    assertFieldAppearanceOptions(options);\n\n    // Create a widget for this button\n    const widget = this.createWidget({\n      x: (options?.x ?? 0) - (options?.borderWidth ?? 0) / 2,\n      y: (options?.y ?? 0) - (options?.borderWidth ?? 0) / 2,\n      width: options?.width ?? 100,\n      height: options?.height ?? 50,\n      textColor: options?.textColor ?? rgb(0, 0, 0),\n      backgroundColor: options?.backgroundColor ?? rgb(0.75, 0.75, 0.75),\n      borderColor: options?.borderColor,\n      borderWidth: options?.borderWidth ?? 0,\n      rotate: options?.rotate ?? degrees(0),\n      caption: text,\n      hidden: options?.hidden,\n      page: page.ref,\n    });\n    const widgetRef = this.doc.context.register(widget.dict);\n\n    // Add widget to this field\n    this.acroField.addWidget(widgetRef);\n\n    // Set appearance streams for widget\n    const font = options?.font ?? this.doc.getForm().getDefaultFont();\n    this.updateWidgetAppearance(widget, font);\n\n    // Add widget to the given page\n    page.node.addAnnot(widgetRef);\n  }\n\n  /**\n   * Returns `true` if this button has been marked as dirty, or if any of this\n   * button's widgets do not have an appearance stream. For example:\n   * ```js\n   * const button = form.getButton('some.button.field')\n   * if (button.needsAppearancesUpdate()) console.log('Needs update')\n   * ```\n   * @returns Whether or not this button needs an appearance update.\n   */\n  needsAppearancesUpdate(): boolean {\n    if (this.isDirty()) return true;\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const hasAppearances =\n        widget.getAppearances()?.normal instanceof PDFStream;\n      if (!hasAppearances) return true;\n    }\n\n    return false;\n  }\n\n  /**\n   * Update the appearance streams for each of this button's widgets using\n   * the default appearance provider for buttons. For example:\n   * ```js\n   * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const button = form.getButton('some.button.field')\n   * button.defaultUpdateAppearances(helvetica)\n   * ```\n   * @param font The font to be used for creating the appearance streams.\n   */\n  defaultUpdateAppearances(font: PDFFont) {\n    assertIs(font, 'font', [[PDFFont, 'PDFFont']]);\n    this.updateAppearances(font);\n  }\n\n  /**\n   * Update the appearance streams for each of this button's widgets using\n   * the given appearance provider. If no `provider` is passed, the default\n   * appearance provider for buttons will be used. For example:\n   * ```js\n   * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const button = form.getButton('some.button.field')\n   * button.updateAppearances(helvetica, (field, widget, font) => {\n   *   ...\n   *   return {\n   *     normal: drawButton(...),\n   *     down: drawButton(...),\n   *   }\n   * })\n   * ```\n   * @param font The font to be used for creating the appearance streams.\n   * @param provider Optionally, the appearance provider to be used for\n   *                 generating the contents of the appearance streams.\n   */\n  updateAppearances(\n    font: PDFFont,\n    provider?: AppearanceProviderFor<PDFButton>,\n  ) {\n    assertIs(font, 'font', [[PDFFont, 'PDFFont']]);\n    assertOrUndefined(provider, 'provider', [Function]);\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      this.updateWidgetAppearance(widget, font, provider);\n    }\n  }\n\n  private updateWidgetAppearance(\n    widget: PDFWidgetAnnotation,\n    font: PDFFont,\n    provider?: AppearanceProviderFor<PDFButton>,\n  ) {\n    const apProvider = provider ?? defaultButtonAppearanceProvider;\n    const appearances = normalizeAppearance(apProvider(this, widget, font));\n    this.updateWidgetAppearanceWithFont(widget, font, appearances);\n  }\n}\n","import PDFDocument from 'src/api/PDFDocument';\nimport PDFPage from 'src/api/PDFPage';\nimport {\n  AppearanceProviderFor,\n  normalizeAppearance,\n  defaultCheckBoxAppearanceProvider,\n} from 'src/api/form/appearances';\nimport { rgb } from 'src/api/colors';\nimport { degrees } from 'src/api/rotations';\nimport PDFField, {\n  FieldAppearanceOptions,\n  assertFieldAppearanceOptions,\n} from 'src/api/form/PDFField';\n\nimport {\n  PDFName,\n  PDFRef,\n  PDFDict,\n  PDFAcroCheckBox,\n  PDFWidgetAnnotation,\n} from 'src/core';\nimport { assertIs, assertOrUndefined } from 'src/utils';\n\n/**\n * Represents a check box field of a [[PDFForm]].\n *\n * [[PDFCheckBox]] fields are interactive boxes that users can click with their\n * mouse. This type of [[PDFField]] has two states: `on` and `off`. The purpose\n * of a check box is to enable users to select from one or more options, where\n * each option is represented by a single check box. Check boxes are typically\n * square in shape and display a check mark when they are in the `on` state.\n */\nexport default class PDFCheckBox extends PDFField {\n  /**\n   * > **NOTE:** You probably don't want to call this method directly. Instead,\n   * > consider using the [[PDFForm.getCheckBox]] method, which will create an\n   * > instance of [[PDFCheckBox]] for you.\n   *\n   * Create an instance of [[PDFCheckBox]] from an existing acroCheckBox and ref\n   *\n   * @param acroCheckBox The underlying `PDFAcroCheckBox` for this check box.\n   * @param ref The unique reference for this check box.\n   * @param doc The document to which this check box will belong.\n   */\n  static of = (acroCheckBox: PDFAcroCheckBox, ref: PDFRef, doc: PDFDocument) =>\n    new PDFCheckBox(acroCheckBox, ref, doc);\n\n  /** The low-level PDFAcroCheckBox wrapped by this check box. */\n  readonly acroField: PDFAcroCheckBox;\n\n  private constructor(\n    acroCheckBox: PDFAcroCheckBox,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) {\n    super(acroCheckBox, ref, doc);\n\n    assertIs(acroCheckBox, 'acroCheckBox', [\n      [PDFAcroCheckBox, 'PDFAcroCheckBox'],\n    ]);\n\n    this.acroField = acroCheckBox;\n  }\n\n  /**\n   * Mark this check box. This operation is analogous to a human user clicking\n   * a check box to fill it in a PDF reader. This method will update the\n   * underlying state of the check box field to indicate it has been selected.\n   * PDF libraries and readers will be able to extract this value from the\n   * saved document and determine that it was selected.\n   *\n   * For example:\n   * ```js\n   * const checkBox = form.getCheckBox('some.checkBox.field')\n   * checkBox.check()\n   * ```\n   *\n   * This method will mark this check box as dirty, causing its appearance\n   * streams to be updated when either [[PDFDocument.save]] or\n   * [[PDFForm.updateFieldAppearances]] is called. The updated appearance\n   * streams will display a check mark inside the widgets of this check box\n   * field.\n   */\n  check() {\n    const onValue = this.acroField.getOnValue() ?? PDFName.of('Yes');\n    this.markAsDirty();\n    this.acroField.setValue(onValue);\n  }\n\n  /**\n   * Clears this check box. This operation is analogous to a human user clicking\n   * a check box to unmark it in a PDF reader. This method will update the\n   * underlying state of the check box field to indicate it has been deselected.\n   * PDF libraries and readers will be able to extract this value from the\n   * saved document and determine that it was not selected.\n   *\n   * For example:\n   * ```js\n   * const checkBox = form.getCheckBox('some.checkBox.field')\n   * checkBox.uncheck()\n   * ```\n   *\n   * This method will mark this check box as dirty. See [[PDFCheckBox.check]]\n   * for more details about what this means.\n   */\n  uncheck() {\n    this.markAsDirty();\n    this.acroField.setValue(PDFName.of('Off'));\n  }\n\n  /**\n   * Returns `true` if this check box is selected (either by a human user via\n   * a PDF reader, or else programmatically via software). For example:\n   * ```js\n   * const checkBox = form.getCheckBox('some.checkBox.field')\n   * if (checkBox.isChecked()) console.log('check box is selected')\n   * ```\n   * @returns Whether or not this check box is selected.\n   */\n  isChecked(): boolean {\n    const onValue = this.acroField.getOnValue();\n    return !!onValue && onValue === this.acroField.getValue();\n  }\n\n  /**\n   * Show this check box on the specified page. For example:\n   * ```js\n   * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const checkBox = form.createCheckBox('some.checkBox.field')\n   *\n   * checkBox.addToPage(page, {\n   *   x: 50,\n   *   y: 75,\n   *   width: 25,\n   *   height: 25,\n   *   textColor: rgb(1, 0, 0),\n   *   backgroundColor: rgb(0, 1, 0),\n   *   borderColor: rgb(0, 0, 1),\n   *   borderWidth: 2,\n   *   rotate: degrees(90),\n   * })\n   * ```\n   * This will create a new widget for this check box field.\n   * @param page The page to which this check box widget should be added.\n   * @param options The options to be used when adding this check box widget.\n   */\n  addToPage(page: PDFPage, options?: FieldAppearanceOptions) {\n    assertIs(page, 'page', [[PDFPage, 'PDFPage']]);\n    assertFieldAppearanceOptions(options);\n\n    if (!options) options = {};\n\n    if (!('textColor' in options)) options.textColor = rgb(0, 0, 0);\n    if (!('backgroundColor' in options)) options.backgroundColor = rgb(1, 1, 1);\n    if (!('borderColor' in options)) options.borderColor = rgb(0, 0, 0);\n    if (!('borderWidth' in options)) options.borderWidth = 1;\n\n    // Create a widget for this check box\n    const widget = this.createWidget({\n      x: options.x ?? 0,\n      y: options.y ?? 0,\n      width: options.width ?? 50,\n      height: options.height ?? 50,\n      textColor: options.textColor,\n      backgroundColor: options.backgroundColor,\n      borderColor: options.borderColor,\n      borderWidth: options.borderWidth ?? 0,\n      rotate: options.rotate ?? degrees(0),\n      hidden: options.hidden,\n      page: page.ref,\n    });\n    const widgetRef = this.doc.context.register(widget.dict);\n\n    // Add widget to this field\n    this.acroField.addWidget(widgetRef);\n\n    // Set appearance streams for widget\n    widget.setAppearanceState(PDFName.of('Off'));\n    this.updateWidgetAppearance(widget, PDFName.of('Yes'));\n\n    // Add widget to the given page\n    page.node.addAnnot(widgetRef);\n  }\n\n  /**\n   * Returns `true` if any of this check box's widgets do not have an\n   * appearance stream for its current state. For example:\n   * ```js\n   * const checkBox = form.getCheckBox('some.checkBox.field')\n   * if (checkBox.needsAppearancesUpdate()) console.log('Needs update')\n   * ```\n   * @returns Whether or not this check box needs an appearance update.\n   */\n  needsAppearancesUpdate(): boolean {\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const state = widget.getAppearanceState();\n      const normal = widget.getAppearances()?.normal;\n\n      if (!(normal instanceof PDFDict)) return true;\n      if (state && !normal.has(state)) return true;\n    }\n\n    return false;\n  }\n\n  /**\n   * Update the appearance streams for each of this check box's widgets using\n   * the default appearance provider for check boxes. For example:\n   * ```js\n   * const checkBox = form.getCheckBox('some.checkBox.field')\n   * checkBox.defaultUpdateAppearances()\n   * ```\n   */\n  defaultUpdateAppearances() {\n    this.updateAppearances();\n  }\n\n  /**\n   * Update the appearance streams for each of this check box's widgets using\n   * the given appearance provider. If no `provider` is passed, the default\n   * appearance provider for check boxs will be used. For example:\n   * ```js\n   * const checkBox = form.getCheckBox('some.checkBox.field')\n   * checkBox.updateAppearances((field, widget) => {\n   *   ...\n   *   return {\n   *     normal: { on: drawCheckBox(...), off: drawCheckBox(...) },\n   *     down: { on: drawCheckBox(...), off: drawCheckBox(...) },\n   *   }\n   * })\n   * ```\n   * @param provider Optionally, the appearance provider to be used for\n   *                 generating the contents of the appearance streams.\n   */\n  updateAppearances(provider?: AppearanceProviderFor<PDFCheckBox>) {\n    assertOrUndefined(provider, 'provider', [Function]);\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const onValue = widget.getOnValue() ?? PDFName.of('Yes');\n      if (!onValue) continue;\n      this.updateWidgetAppearance(widget, onValue, provider);\n    }\n    this.markAsClean();\n  }\n\n  private updateWidgetAppearance(\n    widget: PDFWidgetAnnotation,\n    onValue: PDFName,\n    provider?: AppearanceProviderFor<PDFCheckBox>,\n  ) {\n    const apProvider = provider ?? defaultCheckBoxAppearanceProvider;\n    const appearances = normalizeAppearance(apProvider(this, widget));\n    this.updateOnOffWidgetAppearance(widget, onValue, appearances);\n  }\n}\n","import PDFDocument from 'src/api/PDFDocument';\nimport PDFPage from 'src/api/PDFPage';\nimport PDFFont from 'src/api/PDFFont';\nimport PDFField, {\n  FieldAppearanceOptions,\n  assertFieldAppearanceOptions,\n} from 'src/api/form/PDFField';\nimport {\n  AppearanceProviderFor,\n  normalizeAppearance,\n  defaultDropdownAppearanceProvider,\n} from 'src/api/form/appearances';\nimport { rgb } from 'src/api/colors';\nimport { degrees } from 'src/api/rotations';\n\nimport {\n  PDFHexString,\n  PDFRef,\n  PDFString,\n  PDFStream,\n  PDFWidgetAnnotation,\n  PDFAcroComboBox,\n  AcroChoiceFlags,\n} from 'src/core';\nimport { assertIs, assertOrUndefined, assertPositive } from 'src/utils';\n\n/**\n * Represents a dropdown field of a [[PDFForm]].\n *\n * [[PDFDropdown]] fields are interactive text boxes that display a single\n * element (the currently selected value). The purpose of a dropdown is to\n * enable users to select a single option from a set of possible options. Users\n * can click on a dropdown to view the full list of options it provides.\n * Clicking on an option in the list will cause it to be selected and displayed\n * in the dropdown's text box. Some dropdowns allow users to enter text\n * directly into the box from their keyboard, rather than only being allowed to\n * choose an option from the list (see [[PDFDropdown.isEditable]]).\n */\nexport default class PDFDropdown extends PDFField {\n  /**\n   * > **NOTE:** You probably don't want to call this method directly. Instead,\n   * > consider using the [[PDFForm.getDropdown]] method, which will create an\n   * > instance of [[PDFDropdown]] for you.\n   *\n   * Create an instance of [[PDFDropdown]] from an existing acroComboBox and ref\n   *\n   * @param acroComboBox The underlying `PDFAcroComboBox` for this dropdown.\n   * @param ref The unique reference for this dropdown.\n   * @param doc The document to which this dropdown will belong.\n   */\n  static of = (acroComboBox: PDFAcroComboBox, ref: PDFRef, doc: PDFDocument) =>\n    new PDFDropdown(acroComboBox, ref, doc);\n\n  /** The low-level PDFAcroComboBox wrapped by this dropdown. */\n  readonly acroField: PDFAcroComboBox;\n\n  private constructor(\n    acroComboBox: PDFAcroComboBox,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) {\n    super(acroComboBox, ref, doc);\n\n    assertIs(acroComboBox, 'acroComboBox', [\n      [PDFAcroComboBox, 'PDFAcroComboBox'],\n    ]);\n\n    this.acroField = acroComboBox;\n  }\n\n  /**\n   * Get the list of available options for this dropdown. These options will be\n   * displayed to users who click on this dropdown in a PDF reader.\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * const options = dropdown.getOptions()\n   * console.log('Dropdown options:', options)\n   * ```\n   * @returns The options for this dropdown.\n   */\n  getOptions(): string[] {\n    const rawOptions = this.acroField.getOptions();\n\n    const options = new Array<string>(rawOptions.length);\n    for (let idx = 0, len = options.length; idx < len; idx++) {\n      const { display, value } = rawOptions[idx];\n      options[idx] = (display ?? value).decodeText();\n    }\n\n    return options;\n  }\n\n  /**\n   * Get the selected options for this dropdown. These are the values that were\n   * selected by a human user via a PDF reader, or programatically via\n   * software.\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * const selections = dropdown.getSelected()\n   * console.log('Dropdown selections:', selections)\n   * ```\n   * > **NOTE:** Note that PDF readers only display one selected option when\n   * > rendering dropdowns. However, the PDF specification does allow for\n   * > multiple values to be selected in a dropdown. As such, the `pdf-lib`\n   * > API supports this. However, in most cases the array returned by this\n   * > method will contain only a single element (or no elements).\n   * @returns The selected options in this dropdown.\n   */\n  getSelected(): string[] {\n    const values = this.acroField.getValues();\n\n    const selected = new Array<string>(values.length);\n    for (let idx = 0, len = values.length; idx < len; idx++) {\n      selected[idx] = values[idx].decodeText();\n    }\n\n    return selected;\n  }\n\n  /**\n   * Set the list of options that are available for this dropdown. These are\n   * the values that will be available for users to select when they view this\n   * dropdown in a PDF reader. Note that preexisting options for this dropdown\n   * will be removed. Only the values passed as `options` will be available to\n   * select.\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('planets.dropdown')\n   * dropdown.setOptions(['Earth', 'Mars', 'Pluto', 'Venus'])\n   * ```\n   * @param options The options that should be available in this dropdown.\n   */\n  setOptions(options: string[]) {\n    assertIs(options, 'options', [Array]);\n\n    const optionObjects = new Array<{ value: PDFHexString }>(options.length);\n    for (let idx = 0, len = options.length; idx < len; idx++) {\n      optionObjects[idx] = { value: PDFHexString.fromText(options[idx]) };\n    }\n    this.acroField.setOptions(optionObjects);\n  }\n\n  /**\n   * Add to the list of options that are available for this dropdown. Users\n   * will be able to select these values in a PDF reader. In addition to the\n   * values passed as `options`, any preexisting options for this dropdown will\n   * still be available for users to select.\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('rockets.dropdown')\n   * dropdown.addOptions(['Saturn IV', 'Falcon Heavy'])\n   * ```\n   * @param options New options that should be available in this dropdown.\n   */\n  addOptions(options: string | string[]) {\n    assertIs(options, 'options', ['string', Array]);\n\n    const optionsArr = Array.isArray(options) ? options : [options];\n\n    const existingOptions: {\n      value: PDFString | PDFHexString;\n      display?: PDFString | PDFHexString;\n    }[] = this.acroField.getOptions();\n\n    const newOptions = new Array<{ value: PDFHexString }>(optionsArr.length);\n    for (let idx = 0, len = optionsArr.length; idx < len; idx++) {\n      newOptions[idx] = { value: PDFHexString.fromText(optionsArr[idx]) };\n    }\n\n    this.acroField.setOptions(existingOptions.concat(newOptions));\n  }\n\n  /**\n   * Select one or more values for this dropdown. This operation is analogous\n   * to a human user opening the dropdown in a PDF reader and clicking on a\n   * value to select it. This method will update the underlying state of the\n   * dropdown to indicate which values have been selected. PDF libraries and\n   * readers will be able to extract these values from the saved document and\n   * determine which values were selected.\n   *\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('best.superhero.dropdown')\n   * dropdown.select('One Punch Man')\n   * ```\n   *\n   * This method will mark this dropdown as dirty, causing its appearance\n   * streams to be updated when either [[PDFDocument.save]] or\n   * [[PDFForm.updateFieldAppearances]] is called. The updated streams will\n   * display the selected option inside the widgets of this dropdown.\n   *\n   * **IMPORTANT:** The default font used to update appearance streams is\n   * [[StandardFonts.Helvetica]]. Note that this is a WinAnsi font. This means\n   * that encoding errors will be thrown if the selected option for this field\n   * contains characters outside the WinAnsi character set (the latin alphabet).\n   *\n   * Embedding a custom font and passing it to\n   * [[PDFForm.updateFieldAppearances]] or [[PDFDropdown.updateAppearances]]\n   * allows you to generate appearance streams with characters outside the\n   * latin alphabet (assuming the custom font supports them).\n   *\n   * Selecting an option that does not exist in this dropdown's option list\n   * (see [[PDFDropdown.getOptions]]) will enable editing on this dropdown\n   * (see [[PDFDropdown.enableEditing]]).\n   *\n   * > **NOTE:** PDF readers only display one selected option when rendering\n   * > dropdowns. However, the PDF specification does allow for multiple values\n   * > to be selected in a dropdown. As such, the `pdf-lib` API supports this.\n   * > However, it is not recommended to select more than one value with this\n   * > method, as only one will be visible. [[PDFOptionList]] fields are better\n   * > suited for displaying multiple selected values.\n   *\n   * @param options The options to be selected.\n   * @param merge Whether or not existing selections should be preserved.\n   */\n  select(options: string | string[], merge = false) {\n    assertIs(options, 'options', ['string', Array]);\n    assertIs(merge, 'merge', ['boolean']);\n\n    const optionsArr = Array.isArray(options) ? options : [options];\n\n    const validOptions = this.getOptions();\n    const hasCustomOption = optionsArr.find(\n      (option) => !validOptions.includes(option),\n    );\n    if (hasCustomOption) this.enableEditing();\n\n    this.markAsDirty();\n\n    if (optionsArr.length > 1 || (optionsArr.length === 1 && merge)) {\n      this.enableMultiselect();\n    }\n\n    const values = new Array<PDFHexString>(optionsArr.length);\n    for (let idx = 0, len = optionsArr.length; idx < len; idx++) {\n      values[idx] = PDFHexString.fromText(optionsArr[idx]);\n    }\n\n    if (merge) {\n      const existingValues = this.acroField.getValues();\n      this.acroField.setValues(existingValues.concat(values));\n    } else {\n      this.acroField.setValues(values);\n    }\n  }\n\n  /**\n   * Clear all selected values for this dropdown. This operation is equivalent\n   * to selecting an empty list. This method will update the underlying state\n   * of the dropdown to indicate that no values have been selected.\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.clear()\n   * ```\n   * This method will mark this text field as dirty. See [[PDFDropdown.select]]\n   * for more details about what this means.\n   */\n  clear() {\n    this.markAsDirty();\n    this.acroField.setValues([]);\n  }\n\n  /**\n   * Set the font size for this field. Larger font sizes will result in larger\n   * text being displayed when PDF readers render this dropdown. Font sizes may\n   * be integer or floating point numbers. Supplying a negative font size will\n   * cause this method to throw an error.\n   *\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.setFontSize(4)\n   * dropdown.setFontSize(15.7)\n   * ```\n   *\n   * > This method depends upon the existence of a default appearance\n   * > (`/DA`) string. If this field does not have a default appearance string,\n   * > or that string does not contain a font size (via the `Tf` operator),\n   * > then this method will throw an error.\n   *\n   * @param fontSize The font size to be used when rendering text in this field.\n   */\n  setFontSize(fontSize: number) {\n    assertPositive(fontSize, 'fontSize');\n    this.acroField.setFontSize(fontSize);\n    this.markAsDirty();\n  }\n\n  /**\n   * Returns `true` if users are allowed to edit the selected value of this\n   * dropdown directly and are not constrained by the list of available\n   * options. See [[PDFDropdown.enableEditing]] and\n   * [[PDFDropdown.disableEditing]]. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * if (dropdown.isEditable()) console.log('Editing is enabled')\n   * ```\n   * @returns Whether or not this dropdown is editable.\n   */\n  isEditable(): boolean {\n    return this.acroField.hasFlag(AcroChoiceFlags.Edit);\n  }\n\n  /**\n   * Allow users to edit the selected value of this dropdown in PDF readers\n   * with their keyboard. This means that the selected value of this dropdown\n   * will not be constrained by the list of available options. However, if this\n   * dropdown has any available options, users will still be allowed to select\n   * from that list.\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.enableEditing()\n   * ```\n   */\n  enableEditing() {\n    this.acroField.setFlagTo(AcroChoiceFlags.Edit, true);\n  }\n\n  /**\n   * Do not allow users to edit the selected value of this dropdown in PDF\n   * readers with their keyboard. This will constrain the selected value of\n   * this dropdown to the list of available options. Users will only be able\n   * to select an option from that list.\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.disableEditing()\n   * ```\n   */\n  disableEditing() {\n    this.acroField.setFlagTo(AcroChoiceFlags.Edit, false);\n  }\n\n  /**\n   * Returns `true` if the option list of this dropdown is always displayed\n   * in alphabetical order, irrespective of the order in which the options\n   * were added to the dropdown. See [[PDFDropdown.enableSorting]] and\n   * [[PDFDropdown.disableSorting]]. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * if (dropdown.isSorted()) console.log('Sorting is enabled')\n   * ```\n   * @returns Whether or not this dropdown's options are sorted.\n   */\n  isSorted(): boolean {\n    return this.acroField.hasFlag(AcroChoiceFlags.Sort);\n  }\n\n  /**\n   * Always display the option list of this dropdown in alphabetical order,\n   * irrespective of the order in which the options were added to this dropdown.\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.enableSorting()\n   * ```\n   */\n  enableSorting() {\n    this.acroField.setFlagTo(AcroChoiceFlags.Sort, true);\n  }\n\n  /**\n   * Do not always display the option list of this dropdown in alphabetical\n   * order. Instead, display the options in whichever order they were added\n   * to the list. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.disableSorting()\n   * ```\n   */\n  disableSorting() {\n    this.acroField.setFlagTo(AcroChoiceFlags.Sort, false);\n  }\n\n  /**\n   * Returns `true` if multiple options can be selected from this dropdown's\n   * option list. See [[PDFDropdown.enableMultiselect]] and\n   * [[PDFDropdown.disableMultiselect]]. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * if (dropdown.isMultiselect()) console.log('Multiselect is enabled')\n   * ```\n   * @returns Whether or not multiple options can be selected.\n   */\n  isMultiselect(): boolean {\n    return this.acroField.hasFlag(AcroChoiceFlags.MultiSelect);\n  }\n\n  /**\n   * Allow users to select more than one option from this dropdown's option\n   * list. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.enableMultiselect()\n   * ```\n   */\n  enableMultiselect() {\n    this.acroField.setFlagTo(AcroChoiceFlags.MultiSelect, true);\n  }\n\n  /**\n   * Do not allow users to select more than one option from this dropdown's\n   * option list. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.disableMultiselect()\n   * ```\n   */\n  disableMultiselect() {\n    this.acroField.setFlagTo(AcroChoiceFlags.MultiSelect, false);\n  }\n\n  /**\n   * Returns `true` if the selected option should be spell checked by PDF\n   * readers. Spell checking will only be performed if this dropdown allows\n   * editing (see [[PDFDropdown.isEditable]]). See\n   * [[PDFDropdown.enableSpellChecking]] and\n   * [[PDFDropdown.disableSpellChecking]]. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * if (dropdown.isSpellChecked()) console.log('Spell checking is enabled')\n   * ```\n   * @returns Whether or not this dropdown can be spell checked.\n   */\n  isSpellChecked(): boolean {\n    return !this.acroField.hasFlag(AcroChoiceFlags.DoNotSpellCheck);\n  }\n\n  /**\n   * Allow PDF readers to spell check the selected option of this dropdown.\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.enableSpellChecking()\n   * ```\n   */\n  enableSpellChecking() {\n    this.acroField.setFlagTo(AcroChoiceFlags.DoNotSpellCheck, false);\n  }\n\n  /**\n   * Do not allow PDF readers to spell check the selected option of this\n   * dropdown. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.disableSpellChecking()\n   * ```\n   */\n  disableSpellChecking() {\n    this.acroField.setFlagTo(AcroChoiceFlags.DoNotSpellCheck, true);\n  }\n\n  /**\n   * Returns `true` if the option selected by a user is stored, or \"committed\",\n   * when the user clicks the option. The alternative is that the user's\n   * selection is stored when the user leaves this dropdown field (by clicking\n   * outside of it - on another field, for example). See\n   * [[PDFDropdown.enableSelectOnClick]] and\n   * [[PDFDropdown.disableSelectOnClick]]. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * if (dropdown.isSelectOnClick()) console.log('Select on click is enabled')\n   * ```\n   * @returns Whether or not options are selected immediately after they are\n   *          clicked.\n   */\n  isSelectOnClick(): boolean {\n    return this.acroField.hasFlag(AcroChoiceFlags.CommitOnSelChange);\n  }\n\n  /**\n   * Store the option selected by a user immediately after the user clicks the\n   * option. Do not wait for the user to leave this dropdown field (by clicking\n   * outside of it - on another field, for example). For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.enableSelectOnClick()\n   * ```\n   */\n  enableSelectOnClick() {\n    this.acroField.setFlagTo(AcroChoiceFlags.CommitOnSelChange, true);\n  }\n\n  /**\n   * Wait to store the option selected by a user until they leave this dropdown\n   * field (by clicking outside of it - on another field, for example).\n   * For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.disableSelectOnClick()\n   * ```\n   */\n  disableSelectOnClick() {\n    this.acroField.setFlagTo(AcroChoiceFlags.CommitOnSelChange, false);\n  }\n\n  /**\n   * Show this dropdown on the specified page. For example:\n   * ```js\n   * const ubuntuFont = await pdfDoc.embedFont(ubuntuFontBytes)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const dropdown = form.createDropdown('best.gundam')\n   * dropdown.setOptions(['Exia', 'Dynames'])\n   * dropdown.select('Exia')\n   *\n   * dropdown.addToPage(page, {\n   *   x: 50,\n   *   y: 75,\n   *   width: 200,\n   *   height: 100,\n   *   textColor: rgb(1, 0, 0),\n   *   backgroundColor: rgb(0, 1, 0),\n   *   borderColor: rgb(0, 0, 1),\n   *   borderWidth: 2,\n   *   rotate: degrees(90),\n   *   font: ubuntuFont,\n   * })\n   * ```\n   * This will create a new widget for this dropdown field.\n   * @param page The page to which this dropdown widget should be added.\n   * @param options The options to be used when adding this dropdown widget.\n   */\n  addToPage(page: PDFPage, options?: FieldAppearanceOptions) {\n    assertIs(page, 'page', [[PDFPage, 'PDFPage']]);\n    assertFieldAppearanceOptions(options);\n\n    if (!options) options = {};\n\n    if (!('textColor' in options)) options.textColor = rgb(0, 0, 0);\n    if (!('backgroundColor' in options)) options.backgroundColor = rgb(1, 1, 1);\n    if (!('borderColor' in options)) options.borderColor = rgb(0, 0, 0);\n    if (!('borderWidth' in options)) options.borderWidth = 1;\n\n    // Create a widget for this dropdown\n    const widget = this.createWidget({\n      x: options.x ?? 0,\n      y: options.y ?? 0,\n      width: options.width ?? 200,\n      height: options.height ?? 50,\n      textColor: options.textColor,\n      backgroundColor: options.backgroundColor,\n      borderColor: options.borderColor,\n      borderWidth: options.borderWidth ?? 0,\n      rotate: options.rotate ?? degrees(0),\n      hidden: options.hidden,\n      page: page.ref,\n    });\n    const widgetRef = this.doc.context.register(widget.dict);\n\n    // Add widget to this field\n    this.acroField.addWidget(widgetRef);\n\n    // Set appearance streams for widget\n    const font = options.font ?? this.doc.getForm().getDefaultFont();\n    this.updateWidgetAppearance(widget, font);\n\n    // Add widget to the given page\n    page.node.addAnnot(widgetRef);\n  }\n\n  /**\n   * Returns `true` if this dropdown has been marked as dirty, or if any of\n   * this dropdown's widgets do not have an appearance stream. For example:\n   * ```js\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * if (dropdown.needsAppearancesUpdate()) console.log('Needs update')\n   * ```\n   * @returns Whether or not this dropdown needs an appearance update.\n   */\n  needsAppearancesUpdate(): boolean {\n    if (this.isDirty()) return true;\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const hasAppearances =\n        widget.getAppearances()?.normal instanceof PDFStream;\n      if (!hasAppearances) return true;\n    }\n\n    return false;\n  }\n\n  /**\n   * Update the appearance streams for each of this dropdown's widgets using\n   * the default appearance provider for dropdowns. For example:\n   * ```js\n   * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.defaultUpdateAppearances(helvetica)\n   * ```\n   * @param font The font to be used for creating the appearance streams.\n   */\n  defaultUpdateAppearances(font: PDFFont) {\n    assertIs(font, 'font', [[PDFFont, 'PDFFont']]);\n    this.updateAppearances(font);\n  }\n\n  /**\n   * Update the appearance streams for each of this dropdown's widgets using\n   * the given appearance provider. If no `provider` is passed, the default\n   * appearance provider for dropdowns will be used. For example:\n   * ```js\n   * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const dropdown = form.getDropdown('some.dropdown.field')\n   * dropdown.updateAppearances(helvetica, (field, widget, font) => {\n   *   ...\n   *   return drawTextField(...)\n   * })\n   * ```\n   * @param font The font to be used for creating the appearance streams.\n   * @param provider Optionally, the appearance provider to be used for\n   *                 generating the contents of the appearance streams.\n   */\n  updateAppearances(\n    font: PDFFont,\n    provider?: AppearanceProviderFor<PDFDropdown>,\n  ) {\n    assertIs(font, 'font', [[PDFFont, 'PDFFont']]);\n    assertOrUndefined(provider, 'provider', [Function]);\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      this.updateWidgetAppearance(widget, font, provider);\n    }\n    this.markAsClean();\n  }\n\n  // getOption(index: number): string {}\n  // getSelectedIndices(): number[] {}\n  // removeOptions(option: string | string[]) {}\n  // removeIndices(option: number[]) {}\n  // deselect(options: string | string[]) {}\n  // deselectIndices(optionIndices: number[]) {}\n\n  private updateWidgetAppearance(\n    widget: PDFWidgetAnnotation,\n    font: PDFFont,\n    provider?: AppearanceProviderFor<PDFDropdown>,\n  ) {\n    const apProvider = provider ?? defaultDropdownAppearanceProvider;\n    const appearances = normalizeAppearance(apProvider(this, widget, font));\n    this.updateWidgetAppearanceWithFont(widget, font, appearances);\n  }\n}\n","import PDFDocument from 'src/api/PDFDocument';\nimport PDFFont from 'src/api/PDFFont';\nimport { AppearanceMapping } from 'src/api/form/appearances';\nimport { Color, colorToComponents, setFillingColor } from 'src/api/colors';\nimport {\n  Rotation,\n  toDegrees,\n  rotateRectangle,\n  reduceRotation,\n  adjustDimsForRotation,\n  degrees,\n} from 'src/api/rotations';\n\nimport {\n  PDFRef,\n  PDFWidgetAnnotation,\n  PDFOperator,\n  PDFName,\n  PDFDict,\n  MethodNotImplementedError,\n  AcroFieldFlags,\n  PDFAcroTerminal,\n  AnnotationFlags,\n} from 'src/core';\nimport { assertIs, assertMultiple, assertOrUndefined } from 'src/utils';\nimport { ImageAlignment } from '../image';\nimport PDFImage from '../PDFImage';\nimport { drawImage, rotateInPlace } from '../operations';\n\nexport interface FieldAppearanceOptions {\n  x?: number;\n  y?: number;\n  width?: number;\n  height?: number;\n  textColor?: Color;\n  backgroundColor?: Color;\n  borderColor?: Color;\n  borderWidth?: number;\n  rotate?: Rotation;\n  font?: PDFFont;\n  hidden?: boolean;\n}\n\nexport const assertFieldAppearanceOptions = (\n  options?: FieldAppearanceOptions,\n) => {\n  assertOrUndefined(options?.x, 'options.x', ['number']);\n  assertOrUndefined(options?.y, 'options.y', ['number']);\n  assertOrUndefined(options?.width, 'options.width', ['number']);\n  assertOrUndefined(options?.height, 'options.height', ['number']);\n  assertOrUndefined(options?.textColor, 'options.textColor', [\n    [Object, 'Color'],\n  ]);\n  assertOrUndefined(options?.backgroundColor, 'options.backgroundColor', [\n    [Object, 'Color'],\n  ]);\n  assertOrUndefined(options?.borderColor, 'options.borderColor', [\n    [Object, 'Color'],\n  ]);\n  assertOrUndefined(options?.borderWidth, 'options.borderWidth', ['number']);\n  assertOrUndefined(options?.rotate, 'options.rotate', [[Object, 'Rotation']]);\n};\n\n/**\n * Represents a field of a [[PDFForm]].\n *\n * This class is effectively abstract. All fields in a [[PDFForm]] will\n * actually be an instance of a subclass of this class.\n *\n * Note that each field in a PDF is represented by a single field object.\n * However, a given field object may be rendered at multiple locations within\n * the document (across one or more pages). The rendering of a field is\n * controlled by its widgets. Each widget causes its field to be displayed at a\n * particular location in the document.\n *\n * Most of the time each field in a PDF has only a single widget, and thus is\n * only rendered once. However, if a field is rendered multiple times, it will\n * have multiple widgets - one for each location it is rendered.\n *\n * This abstraction of field objects and widgets is defined in the PDF\n * specification and dictates how PDF files store fields and where they are\n * to be rendered.\n */\nexport default class PDFField {\n  /** The low-level PDFAcroTerminal wrapped by this field. */\n  readonly acroField: PDFAcroTerminal;\n\n  /** The unique reference assigned to this field within the document. */\n  readonly ref: PDFRef;\n\n  /** The document to which this field belongs. */\n  readonly doc: PDFDocument;\n\n  protected constructor(\n    acroField: PDFAcroTerminal,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) {\n    assertIs(acroField, 'acroField', [[PDFAcroTerminal, 'PDFAcroTerminal']]);\n    assertIs(ref, 'ref', [[PDFRef, 'PDFRef']]);\n    assertIs(doc, 'doc', [[PDFDocument, 'PDFDocument']]);\n\n    this.acroField = acroField;\n    this.ref = ref;\n    this.doc = doc;\n  }\n\n  /**\n   * Get the fully qualified name of this field. For example:\n   * ```js\n   * const fields = form.getFields()\n   * fields.forEach(field => {\n   *   const name = field.getName()\n   *   console.log('Field name:', name)\n   * })\n   * ```\n   * Note that PDF fields are structured as a tree. Each field is the\n   * descendent of a series of ancestor nodes all the way up to the form node,\n   * which is always the root of the tree. Each node in the tree (except for\n   * the form node) has a partial name. Partial names can be composed of any\n   * unicode characters except a period (`.`). The fully qualified name of a\n   * field is composed of the partial names of all its ancestors joined\n   * with periods. This means that splitting the fully qualified name on\n   * periods and taking the last element of the resulting array will give you\n   * the partial name of a specific field.\n   * @returns The fully qualified name of this field.\n   */\n  getName(): string {\n    return this.acroField.getFullyQualifiedName() ?? '';\n  }\n\n  /**\n   * Returns `true` if this field is read only. This means that PDF readers\n   * will not allow users to interact with the field or change its value. See\n   * [[PDFField.enableReadOnly]] and [[PDFField.disableReadOnly]].\n   * For example:\n   * ```js\n   * const field = form.getField('some.field')\n   * if (field.isReadOnly()) console.log('Read only is enabled')\n   * ```\n   * @returns Whether or not this is a read only field.\n   */\n  isReadOnly(): boolean {\n    return this.acroField.hasFlag(AcroFieldFlags.ReadOnly);\n  }\n\n  /**\n   * Prevent PDF readers from allowing users to interact with this field or\n   * change its value. The field will not respond to mouse or keyboard input.\n   * For example:\n   * ```js\n   * const field = form.getField('some.field')\n   * field.enableReadOnly()\n   * ```\n   * Useful for fields whose values are computed, imported from a database, or\n   * prefilled by software before being displayed to the user.\n   */\n  enableReadOnly() {\n    this.acroField.setFlagTo(AcroFieldFlags.ReadOnly, true);\n  }\n\n  /**\n   * Allow users to interact with this field and change its value in PDF\n   * readers via mouse and keyboard input. For example:\n   * ```js\n   * const field = form.getField('some.field')\n   * field.disableReadOnly()\n   * ```\n   */\n  disableReadOnly() {\n    this.acroField.setFlagTo(AcroFieldFlags.ReadOnly, false);\n  }\n\n  /**\n   * Returns `true` if this field must have a value when the form is submitted.\n   * See [[PDFField.enableRequired]] and [[PDFField.disableRequired]].\n   * For example:\n   * ```js\n   * const field = form.getField('some.field')\n   * if (field.isRequired()) console.log('Field is required')\n   * ```\n   * @returns Whether or not this field is required.\n   */\n  isRequired(): boolean {\n    return this.acroField.hasFlag(AcroFieldFlags.Required);\n  }\n\n  /**\n   * Require this field to have a value when the form is submitted.\n   * For example:\n   * ```js\n   * const field = form.getField('some.field')\n   * field.enableRequired()\n   * ```\n   */\n  enableRequired() {\n    this.acroField.setFlagTo(AcroFieldFlags.Required, true);\n  }\n\n  /**\n   * Do not require this field to have a value when the form is submitted.\n   * For example:\n   * ```js\n   * const field = form.getField('some.field')\n   * field.disableRequired()\n   * ```\n   */\n  disableRequired() {\n    this.acroField.setFlagTo(AcroFieldFlags.Required, false);\n  }\n\n  /**\n   * Returns `true` if this field's value should be exported when the form is\n   * submitted. See [[PDFField.enableExporting]] and\n   * [[PDFField.disableExporting]].\n   * For example:\n   * ```js\n   * const field = form.getField('some.field')\n   * if (field.isExported()) console.log('Exporting is enabled')\n   * ```\n   * @returns Whether or not this field's value should be exported.\n   */\n  isExported(): boolean {\n    return !this.acroField.hasFlag(AcroFieldFlags.NoExport);\n  }\n\n  /**\n   * Indicate that this field's value should be exported when the form is\n   * submitted in a PDF reader. For example:\n   * ```js\n   * const field = form.getField('some.field')\n   * field.enableExporting()\n   * ```\n   */\n  enableExporting() {\n    this.acroField.setFlagTo(AcroFieldFlags.NoExport, false);\n  }\n\n  /**\n   * Indicate that this field's value should **not** be exported when the form\n   * is submitted in a PDF reader. For example:\n   * ```js\n   * const field = form.getField('some.field')\n   * field.disableExporting()\n   * ```\n   */\n  disableExporting() {\n    this.acroField.setFlagTo(AcroFieldFlags.NoExport, true);\n  }\n\n  /** @ignore */\n  needsAppearancesUpdate(): boolean {\n    throw new MethodNotImplementedError(\n      this.constructor.name,\n      'needsAppearancesUpdate',\n    );\n  }\n\n  /** @ignore */\n  defaultUpdateAppearances(_font: PDFFont) {\n    throw new MethodNotImplementedError(\n      this.constructor.name,\n      'defaultUpdateAppearances',\n    );\n  }\n\n  protected markAsDirty() {\n    this.doc.getForm().markFieldAsDirty(this.ref);\n  }\n\n  protected markAsClean() {\n    this.doc.getForm().markFieldAsClean(this.ref);\n  }\n\n  protected isDirty(): boolean {\n    return this.doc.getForm().fieldIsDirty(this.ref);\n  }\n\n  protected createWidget(options: {\n    x: number;\n    y: number;\n    width: number;\n    height: number;\n    textColor?: Color;\n    backgroundColor?: Color;\n    borderColor?: Color;\n    borderWidth: number;\n    rotate: Rotation;\n    caption?: string;\n    hidden?: boolean;\n    page?: PDFRef;\n  }): PDFWidgetAnnotation {\n    const textColor = options.textColor;\n    const backgroundColor = options.backgroundColor;\n    const borderColor = options.borderColor;\n    const borderWidth = options.borderWidth;\n    const degreesAngle = toDegrees(options.rotate);\n    const caption = options.caption;\n    const x = options.x;\n    const y = options.y;\n    const width = options.width + borderWidth;\n    const height = options.height + borderWidth;\n    const hidden = Boolean(options.hidden);\n    const pageRef = options.page;\n\n    assertMultiple(degreesAngle, 'degreesAngle', 90);\n\n    // Create a widget for this field\n    const widget = PDFWidgetAnnotation.create(this.doc.context, this.ref);\n\n    // Set widget properties\n    const rect = rotateRectangle(\n      { x, y, width, height },\n      borderWidth,\n      degreesAngle,\n    );\n    widget.setRectangle(rect);\n\n    if (pageRef) widget.setP(pageRef);\n\n    const ac = widget.getOrCreateAppearanceCharacteristics();\n    if (backgroundColor) {\n      ac.setBackgroundColor(colorToComponents(backgroundColor));\n    }\n    ac.setRotation(degreesAngle);\n    if (caption) ac.setCaptions({ normal: caption });\n    if (borderColor) ac.setBorderColor(colorToComponents(borderColor));\n\n    const bs = widget.getOrCreateBorderStyle();\n    if (borderWidth !== undefined) bs.setWidth(borderWidth);\n\n    widget.setFlagTo(AnnotationFlags.Print, true);\n    widget.setFlagTo(AnnotationFlags.Hidden, hidden);\n    widget.setFlagTo(AnnotationFlags.Invisible, false);\n\n    // Set acrofield properties\n    if (textColor) {\n      const da = this.acroField.getDefaultAppearance() ?? '';\n      const newDa = da + '\\n' + setFillingColor(textColor).toString();\n      this.acroField.setDefaultAppearance(newDa);\n    }\n\n    return widget;\n  }\n\n  protected updateWidgetAppearanceWithFont(\n    widget: PDFWidgetAnnotation,\n    font: PDFFont,\n    { normal, rollover, down }: AppearanceMapping<PDFOperator[]>,\n  ) {\n    this.updateWidgetAppearances(widget, {\n      normal: this.createAppearanceStream(widget, normal, font),\n      rollover: rollover && this.createAppearanceStream(widget, rollover, font),\n      down: down && this.createAppearanceStream(widget, down, font),\n    });\n  }\n\n  protected updateOnOffWidgetAppearance(\n    widget: PDFWidgetAnnotation,\n    onValue: PDFName,\n    {\n      normal,\n      rollover,\n      down,\n    }: AppearanceMapping<{ on: PDFOperator[]; off: PDFOperator[] }>,\n  ) {\n    this.updateWidgetAppearances(widget, {\n      normal: this.createAppearanceDict(widget, normal, onValue),\n      rollover:\n        rollover && this.createAppearanceDict(widget, rollover, onValue),\n      down: down && this.createAppearanceDict(widget, down, onValue),\n    });\n  }\n\n  protected updateWidgetAppearances(\n    widget: PDFWidgetAnnotation,\n    { normal, rollover, down }: AppearanceMapping<PDFRef | PDFDict>,\n  ) {\n    widget.setNormalAppearance(normal);\n\n    if (rollover) {\n      widget.setRolloverAppearance(rollover);\n    } else {\n      widget.removeRolloverAppearance();\n    }\n\n    if (down) {\n      widget.setDownAppearance(down);\n    } else {\n      widget.removeDownAppearance();\n    }\n  }\n\n  // // TODO: Do we need to do this...?\n  // private foo(font: PDFFont, dict: PDFDict) {\n  //   if (!dict.lookup(PDFName.of('DR'))) {\n  //     dict.set(PDFName.of('DR'), dict.context.obj({}));\n  //   }\n  //   const DR = dict.lookup(PDFName.of('DR'), PDFDict);\n\n  //   if (!DR.lookup(PDFName.of('Font'))) {\n  //     DR.set(PDFName.of('Font'), dict.context.obj({}));\n  //   }\n  //   const Font = DR.lookup(PDFName.of('Font'), PDFDict);\n\n  //   Font.set(PDFName.of(font.name), font.ref);\n  // }\n\n  private createAppearanceStream(\n    widget: PDFWidgetAnnotation,\n    appearance: PDFOperator[],\n    font?: PDFFont,\n  ): PDFRef {\n    const { context } = this.acroField.dict;\n    const { width, height } = widget.getRectangle();\n\n    // TODO: Do we need to do this...?\n    // if (font) {\n    //   this.foo(font, widget.dict);\n    //   this.foo(font, this.doc.getForm().acroForm.dict);\n    // }\n    // END TODO\n\n    const Resources = font && { Font: { [font.name]: font.ref } };\n    const stream = context.formXObject(appearance, {\n      Resources,\n      BBox: context.obj([0, 0, width, height]),\n      Matrix: context.obj([1, 0, 0, 1, 0, 0]),\n    });\n    const streamRef = context.register(stream);\n\n    return streamRef;\n  }\n\n  /**\n   * Create a FormXObject of the supplied image and add it to context.\n   * The FormXObject size is calculated based on the widget (including\n   * the alignment).\n   * @param widget The widget that should display the image.\n   * @param alignment The alignment of the image.\n   * @param image The image that should be displayed.\n   * @returns The ref for the FormXObject that was added to the context.\n   */\n  protected createImageAppearanceStream(\n    widget: PDFWidgetAnnotation,\n    image: PDFImage,\n    alignment: ImageAlignment,\n  ): PDFRef {\n    // NOTE: This implementation doesn't handle image borders.\n    // NOTE: Acrobat seems to resize the image (maybe even skewing its aspect\n    //       ratio) to fit perfectly within the widget's rectangle. This method\n    //       does not currently do that. Should there be an option for that?\n\n    const { context } = this.acroField.dict;\n\n    const rectangle = widget.getRectangle();\n    const ap = widget.getAppearanceCharacteristics();\n    const bs = widget.getBorderStyle();\n\n    const borderWidth = bs?.getWidth() ?? 0;\n    const rotation = reduceRotation(ap?.getRotation());\n\n    const rotate = rotateInPlace({ ...rectangle, rotation });\n\n    const adj = adjustDimsForRotation(rectangle, rotation);\n    const imageDims = image.scaleToFit(\n      adj.width - borderWidth * 2,\n      adj.height - borderWidth * 2,\n    );\n\n    // Support borders on images and maybe other properties\n    const options = {\n      x: borderWidth,\n      y: borderWidth,\n      width: imageDims.width,\n      height: imageDims.height,\n      //\n      rotate: degrees(0),\n      xSkew: degrees(0),\n      ySkew: degrees(0),\n    };\n\n    if (alignment === ImageAlignment.Center) {\n      options.x += (adj.width - borderWidth * 2) / 2 - imageDims.width / 2;\n      options.y += (adj.height - borderWidth * 2) / 2 - imageDims.height / 2;\n    } else if (alignment === ImageAlignment.Right) {\n      options.x = adj.width - borderWidth - imageDims.width;\n      options.y = adj.height - borderWidth - imageDims.height;\n    }\n\n    const imageName = this.doc.context.addRandomSuffix('Image', 10);\n    const appearance = [...rotate, ...drawImage(imageName, options)];\n    ////////////\n\n    const Resources = { XObject: { [imageName]: image.ref } };\n    const stream = context.formXObject(appearance, {\n      Resources,\n      BBox: context.obj([0, 0, rectangle.width, rectangle.height]),\n      Matrix: context.obj([1, 0, 0, 1, 0, 0]),\n    });\n\n    return context.register(stream);\n  }\n\n  private createAppearanceDict(\n    widget: PDFWidgetAnnotation,\n    appearance: { on: PDFOperator[]; off: PDFOperator[] },\n    onValue: PDFName,\n  ): PDFDict {\n    const { context } = this.acroField.dict;\n\n    const onStreamRef = this.createAppearanceStream(widget, appearance.on);\n    const offStreamRef = this.createAppearanceStream(widget, appearance.off);\n\n    const appearanceDict = context.obj({});\n    appearanceDict.set(onValue, onStreamRef);\n    appearanceDict.set(PDFName.of('Off'), offStreamRef);\n\n    return appearanceDict;\n  }\n}\n","import PDFDocument from 'src/api/PDFDocument';\nimport PDFPage from 'src/api/PDFPage';\nimport PDFField from 'src/api/form/PDFField';\nimport PDFButton from 'src/api/form/PDFButton';\nimport PDFCheckBox from 'src/api/form/PDFCheckBox';\nimport PDFDropdown from 'src/api/form/PDFDropdown';\nimport PDFOptionList from 'src/api/form/PDFOptionList';\nimport PDFRadioGroup from 'src/api/form/PDFRadioGroup';\nimport PDFSignature from 'src/api/form/PDFSignature';\nimport PDFTextField from 'src/api/form/PDFTextField';\nimport {\n  NoSuchFieldError,\n  UnexpectedFieldTypeError,\n  FieldAlreadyExistsError,\n  InvalidFieldNamePartError,\n} from 'src/api/errors';\nimport PDFFont from 'src/api/PDFFont';\nimport { StandardFonts } from 'src/api/StandardFonts';\nimport { rotateInPlace } from 'src/api/operations';\nimport {\n  drawObject,\n  popGraphicsState,\n  pushGraphicsState,\n  translate,\n} from 'src/api/operators';\nimport {\n  PDFAcroForm,\n  PDFAcroField,\n  PDFAcroCheckBox,\n  PDFAcroComboBox,\n  PDFAcroListBox,\n  PDFAcroRadioButton,\n  PDFAcroSignature,\n  PDFAcroText,\n  PDFAcroPushButton,\n  PDFAcroNonTerminal,\n  PDFDict,\n  PDFOperator,\n  PDFRef,\n  createPDFAcroFields,\n  PDFName,\n  PDFWidgetAnnotation,\n} from 'src/core';\nimport { assertIs, Cache, assertOrUndefined } from 'src/utils';\n\nexport interface FlattenOptions {\n  updateFieldAppearances: boolean;\n}\n\n/**\n * Represents the interactive form of a [[PDFDocument]].\n *\n * Interactive forms (sometimes called _AcroForms_) are collections of fields\n * designed to gather information from a user. A PDF document may contains any\n * number of fields that appear on various pages, all of which make up a single,\n * global interactive form spanning the entire document. This means that\n * instances of [[PDFDocument]] shall contain at most one [[PDFForm]].\n *\n * The fields of an interactive form are represented by [[PDFField]] instances.\n */\nexport default class PDFForm {\n  /**\n   * > **NOTE:** You probably don't want to call this method directly. Instead,\n   * > consider using the [[PDFDocument.getForm]] method, which will create an\n   * > instance of [[PDFForm]] for you.\n   *\n   * Create an instance of [[PDFForm]] from an existing acroForm and embedder\n   *\n   * @param acroForm The underlying `PDFAcroForm` for this form.\n   * @param doc The document to which the form will belong.\n   */\n  static of = (acroForm: PDFAcroForm, doc: PDFDocument) =>\n    new PDFForm(acroForm, doc);\n\n  /** The low-level PDFAcroForm wrapped by this form. */\n  readonly acroForm: PDFAcroForm;\n\n  /** The document to which this form belongs. */\n  readonly doc: PDFDocument;\n\n  private readonly dirtyFields: Set<PDFRef>;\n  private readonly defaultFontCache: Cache<PDFFont>;\n\n  private constructor(acroForm: PDFAcroForm, doc: PDFDocument) {\n    assertIs(acroForm, 'acroForm', [[PDFAcroForm, 'PDFAcroForm']]);\n    assertIs(doc, 'doc', [[PDFDocument, 'PDFDocument']]);\n\n    this.acroForm = acroForm;\n    this.doc = doc;\n\n    this.dirtyFields = new Set();\n    this.defaultFontCache = Cache.populatedBy(this.embedDefaultFont);\n  }\n\n  /**\n   * Returns `true` if this [[PDFForm]] has XFA data. Most PDFs with form\n   * fields do not use XFA as it is not widely supported by PDF readers.\n   *\n   * > `pdf-lib` does not support creation, modification, or reading of XFA\n   * > fields.\n   *\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * if (form.hasXFA()) console.log('PDF has XFA data')\n   * ```\n   * @returns Whether or not this form has XFA data.\n   */\n  hasXFA(): boolean {\n    return this.acroForm.dict.has(PDFName.of('XFA'));\n  }\n\n  /**\n   * Disconnect the XFA data from this [[PDFForm]] (if any exists). This will\n   * force readers to fallback to standard fields if the [[PDFDocument]]\n   * contains any. For example:\n   *\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * form.deleteXFA()\n   * ```\n   */\n  deleteXFA(): void {\n    this.acroForm.dict.delete(PDFName.of('XFA'));\n  }\n\n  /**\n   * Get all fields contained in this [[PDFForm]]. For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const fields = form.getFields()\n   * fields.forEach(field => {\n   *   const type = field.constructor.name\n   *   const name = field.getName()\n   *   console.log(`${type}: ${name}`)\n   * })\n   * ```\n   * @returns An array of all fields in this form.\n   */\n  getFields(): PDFField[] {\n    const allFields = this.acroForm.getAllFields();\n\n    const fields: PDFField[] = [];\n    for (let idx = 0, len = allFields.length; idx < len; idx++) {\n      const [acroField, ref] = allFields[idx];\n      const field = convertToPDFField(acroField, ref, this.doc);\n      if (field) fields.push(field);\n    }\n\n    return fields;\n  }\n\n  /**\n   * Get the field in this [[PDFForm]] with the given name. For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const field = form.getFieldMaybe('Page1.Foo.Bar[0]')\n   * if (field) console.log('Field exists!')\n   * ```\n   * @param name A fully qualified field name.\n   * @returns The field with the specified name, if one exists.\n   */\n  getFieldMaybe(name: string): PDFField | undefined {\n    assertIs(name, 'name', ['string']);\n    const fields = this.getFields();\n    for (let idx = 0, len = fields.length; idx < len; idx++) {\n      const field = fields[idx];\n      if (field.getName() === name) return field;\n    }\n    return undefined;\n  }\n\n  /**\n   * Get the field in this [[PDFForm]] with the given name. For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const field = form.getField('Page1.Foo.Bar[0]')\n   * ```\n   * If no field exists with the provided name, an error will be thrown.\n   * @param name A fully qualified field name.\n   * @returns The field with the specified name.\n   */\n  getField(name: string): PDFField {\n    assertIs(name, 'name', ['string']);\n    const field = this.getFieldMaybe(name);\n    if (field) return field;\n    throw new NoSuchFieldError(name);\n  }\n\n  /**\n   * Get the button field in this [[PDFForm]] with the given name. For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const button = form.getButton('Page1.Foo.Button[0]')\n   * ```\n   * An error will be thrown if no field exists with the provided name, or if\n   * the field exists but is not a button.\n   * @param name A fully qualified button name.\n   * @returns The button with the specified name.\n   */\n  getButton(name: string): PDFButton {\n    assertIs(name, 'name', ['string']);\n    const field = this.getField(name);\n    if (field instanceof PDFButton) return field;\n    throw new UnexpectedFieldTypeError(name, PDFButton, field);\n  }\n\n  /**\n   * Get the check box field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const checkBox = form.getCheckBox('Page1.Foo.CheckBox[0]')\n   * checkBox.check()\n   * ```\n   * An error will be thrown if no field exists with the provided name, or if\n   * the field exists but is not a check box.\n   * @param name A fully qualified check box name.\n   * @returns The check box with the specified name.\n   */\n  getCheckBox(name: string): PDFCheckBox {\n    assertIs(name, 'name', ['string']);\n    const field = this.getField(name);\n    if (field instanceof PDFCheckBox) return field;\n    throw new UnexpectedFieldTypeError(name, PDFCheckBox, field);\n  }\n\n  /**\n   * Get the dropdown field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const dropdown = form.getDropdown('Page1.Foo.Dropdown[0]')\n   * const options = dropdown.getOptions()\n   * dropdown.select(options[0])\n   * ```\n   * An error will be thrown if no field exists with the provided name, or if\n   * the field exists but is not a dropdown.\n   * @param name A fully qualified dropdown name.\n   * @returns The dropdown with the specified name.\n   */\n  getDropdown(name: string): PDFDropdown {\n    assertIs(name, 'name', ['string']);\n    const field = this.getField(name);\n    if (field instanceof PDFDropdown) return field;\n    throw new UnexpectedFieldTypeError(name, PDFDropdown, field);\n  }\n\n  /**\n   * Get the option list field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const optionList = form.getOptionList('Page1.Foo.OptionList[0]')\n   * const options = optionList.getOptions()\n   * optionList.select(options[0])\n   * ```\n   * An error will be thrown if no field exists with the provided name, or if\n   * the field exists but is not an option list.\n   * @param name A fully qualified option list name.\n   * @returns The option list with the specified name.\n   */\n  getOptionList(name: string): PDFOptionList {\n    assertIs(name, 'name', ['string']);\n    const field = this.getField(name);\n    if (field instanceof PDFOptionList) return field;\n    throw new UnexpectedFieldTypeError(name, PDFOptionList, field);\n  }\n\n  /**\n   * Get the radio group field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const radioGroup = form.getRadioGroup('Page1.Foo.RadioGroup[0]')\n   * const options = radioGroup.getOptions()\n   * radioGroup.select(options[0])\n   * ```\n   * An error will be thrown if no field exists with the provided name, or if\n   * the field exists but is not a radio group.\n   * @param name A fully qualified radio group name.\n   * @returns The radio group with the specified name.\n   */\n  getRadioGroup(name: string): PDFRadioGroup {\n    assertIs(name, 'name', ['string']);\n    const field = this.getField(name);\n    if (field instanceof PDFRadioGroup) return field;\n    throw new UnexpectedFieldTypeError(name, PDFRadioGroup, field);\n  }\n\n  /**\n   * Get the signature field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const signature = form.getSignature('Page1.Foo.Signature[0]')\n   * ```\n   * An error will be thrown if no field exists with the provided name, or if\n   * the field exists but is not a signature.\n   * @param name A fully qualified signature name.\n   * @returns The signature with the specified name.\n   */\n  getSignature(name: string): PDFSignature {\n    assertIs(name, 'name', ['string']);\n    const field = this.getField(name);\n    if (field instanceof PDFSignature) return field;\n    throw new UnexpectedFieldTypeError(name, PDFSignature, field);\n  }\n\n  /**\n   * Get the text field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const textField = form.getTextField('Page1.Foo.TextField[0]')\n   * textField.setText('Are you designed to act or to be acted upon?')\n   * ```\n   * An error will be thrown if no field exists with the provided name, or if\n   * the field exists but is not a text field.\n   * @param name A fully qualified text field name.\n   * @returns The text field with the specified name.\n   */\n  getTextField(name: string): PDFTextField {\n    assertIs(name, 'name', ['string']);\n    const field = this.getField(name);\n    if (field instanceof PDFTextField) return field;\n    throw new UnexpectedFieldTypeError(name, PDFTextField, field);\n  }\n\n  /**\n   * Create a new button field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const font = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const button = form.createButton('cool.new.button')\n   *\n   * button.addToPage('Do Stuff', font, page)\n   * ```\n   * An error will be thrown if a field already exists with the provided name.\n   * @param name The fully qualified name for the new button.\n   * @returns The new button field.\n   */\n  createButton(name: string): PDFButton {\n    assertIs(name, 'name', ['string']);\n\n    const nameParts = splitFieldName(name);\n    const parent = this.findOrCreateNonTerminals(nameParts.nonTerminal);\n\n    const button = PDFAcroPushButton.create(this.doc.context);\n    button.setPartialName(nameParts.terminal);\n\n    addFieldToParent(parent, [button, button.ref], nameParts.terminal);\n\n    return PDFButton.of(button, button.ref, this.doc);\n  }\n\n  /**\n   * Create a new check box field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const font = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const checkBox = form.createCheckBox('cool.new.checkBox')\n   *\n   * checkBox.addToPage(page)\n   * ```\n   * An error will be thrown if a field already exists with the provided name.\n   * @param name The fully qualified name for the new check box.\n   * @returns The new check box field.\n   */\n  createCheckBox(name: string): PDFCheckBox {\n    assertIs(name, 'name', ['string']);\n\n    const nameParts = splitFieldName(name);\n    const parent = this.findOrCreateNonTerminals(nameParts.nonTerminal);\n\n    const checkBox = PDFAcroCheckBox.create(this.doc.context);\n    checkBox.setPartialName(nameParts.terminal);\n\n    addFieldToParent(parent, [checkBox, checkBox.ref], nameParts.terminal);\n\n    return PDFCheckBox.of(checkBox, checkBox.ref, this.doc);\n  }\n\n  /**\n   * Create a new dropdown field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const font = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const dropdown = form.createDropdown('cool.new.dropdown')\n   *\n   * dropdown.addToPage(font, page)\n   * ```\n   * An error will be thrown if a field already exists with the provided name.\n   * @param name The fully qualified name for the new dropdown.\n   * @returns The new dropdown field.\n   */\n  createDropdown(name: string): PDFDropdown {\n    assertIs(name, 'name', ['string']);\n\n    const nameParts = splitFieldName(name);\n    const parent = this.findOrCreateNonTerminals(nameParts.nonTerminal);\n\n    const comboBox = PDFAcroComboBox.create(this.doc.context);\n    comboBox.setPartialName(nameParts.terminal);\n\n    addFieldToParent(parent, [comboBox, comboBox.ref], nameParts.terminal);\n\n    return PDFDropdown.of(comboBox, comboBox.ref, this.doc);\n  }\n\n  /**\n   * Create a new option list field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const font = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const optionList = form.createOptionList('cool.new.optionList')\n   *\n   * optionList.addToPage(font, page)\n   * ```\n   * An error will be thrown if a field already exists with the provided name.\n   * @param name The fully qualified name for the new option list.\n   * @returns The new option list field.\n   */\n  createOptionList(name: string): PDFOptionList {\n    assertIs(name, 'name', ['string']);\n\n    const nameParts = splitFieldName(name);\n    const parent = this.findOrCreateNonTerminals(nameParts.nonTerminal);\n\n    const listBox = PDFAcroListBox.create(this.doc.context);\n    listBox.setPartialName(nameParts.terminal);\n\n    addFieldToParent(parent, [listBox, listBox.ref], nameParts.terminal);\n\n    return PDFOptionList.of(listBox, listBox.ref, this.doc);\n  }\n\n  /**\n   * Create a new radio group field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const font = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const radioGroup = form.createRadioGroup('cool.new.radioGroup')\n   *\n   * radioGroup.addOptionToPage('is-dog', page, { y: 0 })\n   * radioGroup.addOptionToPage('is-cat', page, { y: 75 })\n   * ```\n   * An error will be thrown if a field already exists with the provided name.\n   * @param name The fully qualified name for the new radio group.\n   * @returns The new radio group field.\n   */\n  createRadioGroup(name: string): PDFRadioGroup {\n    assertIs(name, 'name', ['string']);\n    const nameParts = splitFieldName(name);\n\n    const parent = this.findOrCreateNonTerminals(nameParts.nonTerminal);\n\n    const radioButton = PDFAcroRadioButton.create(this.doc.context);\n    radioButton.setPartialName(nameParts.terminal);\n\n    addFieldToParent(\n      parent,\n      [radioButton, radioButton.ref],\n      nameParts.terminal,\n    );\n\n    return PDFRadioGroup.of(radioButton, radioButton.ref, this.doc);\n  }\n\n  /**\n   * Create a new text field in this [[PDFForm]] with the given name.\n   * For example:\n   * ```js\n   * const font = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const textField = form.createTextField('cool.new.textField')\n   *\n   * textField.addToPage(font, page)\n   * ```\n   * An error will be thrown if a field already exists with the provided name.\n   * @param name The fully qualified name for the new radio group.\n   * @returns The new radio group field.\n   */\n  createTextField(name: string): PDFTextField {\n    assertIs(name, 'name', ['string']);\n    const nameParts = splitFieldName(name);\n\n    const parent = this.findOrCreateNonTerminals(nameParts.nonTerminal);\n\n    const text = PDFAcroText.create(this.doc.context);\n    text.setPartialName(nameParts.terminal);\n\n    addFieldToParent(parent, [text, text.ref], nameParts.terminal);\n\n    return PDFTextField.of(text, text.ref, this.doc);\n  }\n\n  /**\n   * Flatten all fields in this [[PDFForm]].\n   *\n   * Flattening a form field will take the current appearance for each of that\n   * field's widgets and make them part of their page's content stream. All form\n   * fields and annotations associated are then removed. Note that once a form\n   * has been flattened its fields can no longer be accessed or edited.\n   *\n   * This operation is often used after filling form fields to ensure a\n   * consistent appearance across different PDF readers and/or printers.\n   * Another common use case is to copy a template document with form fields\n   * into another document. In this scenario you would load the template\n   * document, fill its fields, flatten it, and then copy its pages into the\n   * recipient document - the filled fields will be copied over.\n   *\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm();\n   * form.flatten();\n   * ```\n   */\n  flatten(options: FlattenOptions = { updateFieldAppearances: true }) {\n    if (options.updateFieldAppearances) {\n      this.updateFieldAppearances();\n    }\n\n    const fields = this.getFields();\n\n    for (let i = 0, lenFields = fields.length; i < lenFields; i++) {\n      const field = fields[i];\n      const widgets = field.acroField.getWidgets();\n\n      for (let j = 0, lenWidgets = widgets.length; j < lenWidgets; j++) {\n        const widget = widgets[j];\n        const page = this.findWidgetPage(widget);\n        const widgetRef = this.findWidgetAppearanceRef(field, widget);\n\n        const xObjectKey = page.node.newXObject('FlatWidget', widgetRef);\n\n        const rectangle = widget.getRectangle();\n        const operators = [\n          pushGraphicsState(),\n          translate(rectangle.x, rectangle.y),\n          ...rotateInPlace({ ...rectangle, rotation: 0 }),\n          drawObject(xObjectKey),\n          popGraphicsState(),\n        ].filter(Boolean) as PDFOperator[];\n\n        page.pushOperators(...operators);\n      }\n\n      this.removeField(field);\n    }\n  }\n\n  /**\n   * Remove a field from this [[PDFForm]].\n   *\n   * For example:\n   * ```js\n   * const form = pdfDoc.getForm();\n   * const ageField = form.getFields().find(x => x.getName() === 'Age');\n   * form.removeField(ageField);\n   * ```\n   */\n  removeField(field: PDFField) {\n    const widgets = field.acroField.getWidgets();\n    const pages: Set<PDFPage> = new Set();\n\n    for (let i = 0, len = widgets.length; i < len; i++) {\n      const widget = widgets[i];\n      const widgetRef = this.findWidgetAppearanceRef(field, widget);\n\n      const page = this.findWidgetPage(widget);\n      pages.add(page);\n\n      page.node.removeAnnot(widgetRef);\n    }\n\n    pages.forEach((page) => page.node.removeAnnot(field.ref));\n    this.acroForm.removeField(field.acroField);\n    const fieldKids = field.acroField.normalizedEntries().Kids;\n    const kidsCount = fieldKids.size();\n    for (let childIndex = 0; childIndex < kidsCount; childIndex++) {\n      const child = fieldKids.get(childIndex);\n      if (child instanceof PDFRef) {\n        this.doc.context.delete(child);\n      }\n    }\n    this.doc.context.delete(field.ref);\n  }\n\n  /**\n   * Update the appearance streams for all widgets of all fields in this\n   * [[PDFForm]]. Appearance streams will only be created for a widget if it\n   * does not have any existing appearance streams, or the field's value has\n   * changed (e.g. by calling [[PDFTextField.setText]] or\n   * [[PDFDropdown.select]]).\n   *\n   * For example:\n   * ```js\n   * const courier = await pdfDoc.embedFont(StandardFonts.Courier)\n   * const form = pdfDoc.getForm()\n   * form.updateFieldAppearances(courier)\n   * ```\n   *\n   * **IMPORTANT:** The default value for the `font` parameter is\n   * [[StandardFonts.Helvetica]]. Note that this is a WinAnsi font. This means\n   * that encoding errors will be thrown if any fields contain text with\n   * characters outside the WinAnsi character set (the latin alphabet).\n   *\n   * Embedding a custom font and passing that as the `font`\n   * parameter allows you to generate appearance streams with non WinAnsi\n   * characters (assuming your custom font supports them).\n   *\n   * > **NOTE:** The [[PDFDocument.save]] method will call this method to\n   * > update appearances automatically if a form was accessed via the\n   * > [[PDFDocument.getForm]] method prior to saving.\n   *\n   * @param font Optionally, the font to use when creating new appearances.\n   */\n  updateFieldAppearances(font?: PDFFont) {\n    assertOrUndefined(font, 'font', [[PDFFont, 'PDFFont']]);\n\n    font = font ?? this.getDefaultFont();\n\n    const fields = this.getFields();\n\n    for (let idx = 0, len = fields.length; idx < len; idx++) {\n      const field = fields[idx];\n      if (field.needsAppearancesUpdate()) {\n        field.defaultUpdateAppearances(font);\n      }\n    }\n  }\n\n  /**\n   * Mark a field as dirty. This will cause its appearance streams to be\n   * updated by [[PDFForm.updateFieldAppearances]].\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const field = form.getField('foo.bar')\n   * form.markFieldAsDirty(field.ref)\n   * ```\n   * @param fieldRef The reference to the field that should be marked.\n   */\n  markFieldAsDirty(fieldRef: PDFRef) {\n    assertOrUndefined(fieldRef, 'fieldRef', [[PDFRef, 'PDFRef']]);\n    this.dirtyFields.add(fieldRef);\n  }\n\n  /**\n   * Mark a field as dirty. This will cause its appearance streams to not be\n   * updated by [[PDFForm.updateFieldAppearances]].\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const field = form.getField('foo.bar')\n   * form.markFieldAsClean(field.ref)\n   * ```\n   * @param fieldRef The reference to the field that should be marked.\n   */\n  markFieldAsClean(fieldRef: PDFRef) {\n    assertOrUndefined(fieldRef, 'fieldRef', [[PDFRef, 'PDFRef']]);\n    this.dirtyFields.delete(fieldRef);\n  }\n\n  /**\n   * Returns `true` is the specified field has been marked as dirty.\n   * ```js\n   * const form = pdfDoc.getForm()\n   * const field = form.getField('foo.bar')\n   * if (form.fieldIsDirty(field.ref)) console.log('Field is dirty')\n   * ```\n   * @param fieldRef The reference to the field that should be checked.\n   * @returns Whether or not the specified field is dirty.\n   */\n  fieldIsDirty(fieldRef: PDFRef): boolean {\n    assertOrUndefined(fieldRef, 'fieldRef', [[PDFRef, 'PDFRef']]);\n    return this.dirtyFields.has(fieldRef);\n  }\n\n  getDefaultFont() {\n    return this.defaultFontCache.access();\n  }\n\n  private findWidgetPage(widget: PDFWidgetAnnotation): PDFPage {\n    const pageRef = widget.P();\n    let page = this.doc.getPages().find((x) => x.ref === pageRef);\n    if (page === undefined) {\n      const widgetRef = this.doc.context.getObjectRef(widget.dict);\n      if (widgetRef === undefined) {\n        throw new Error('Could not find PDFRef for PDFObject');\n      }\n\n      page = this.doc.findPageForAnnotationRef(widgetRef);\n\n      if (page === undefined) {\n        throw new Error(`Could not find page for PDFRef ${widgetRef}`);\n      }\n    }\n\n    return page;\n  }\n\n  private findWidgetAppearanceRef(\n    field: PDFField,\n    widget: PDFWidgetAnnotation,\n  ): PDFRef {\n    let refOrDict = widget.getNormalAppearance();\n\n    if (\n      refOrDict instanceof PDFDict &&\n      (field instanceof PDFCheckBox || field instanceof PDFRadioGroup)\n    ) {\n      const value = field.acroField.getValue();\n      const ref = refOrDict.get(value) ?? refOrDict.get(PDFName.of('Off'));\n\n      if (ref instanceof PDFRef) {\n        refOrDict = ref;\n      }\n    }\n\n    if (!(refOrDict instanceof PDFRef)) {\n      const name = field.getName();\n      throw new Error(`Failed to extract appearance ref for: ${name}`);\n    }\n\n    return refOrDict;\n  }\n\n  private findOrCreateNonTerminals(partialNames: string[]) {\n    let nonTerminal: [PDFAcroForm] | [PDFAcroNonTerminal, PDFRef] = [\n      this.acroForm,\n    ];\n    for (let idx = 0, len = partialNames.length; idx < len; idx++) {\n      const namePart = partialNames[idx];\n      if (!namePart) throw new InvalidFieldNamePartError(namePart);\n      const [parent, parentRef] = nonTerminal;\n      const res = this.findNonTerminal(namePart, parent);\n\n      if (res) {\n        nonTerminal = res;\n      } else {\n        const node = PDFAcroNonTerminal.create(this.doc.context);\n        node.setPartialName(namePart);\n        node.setParent(parentRef);\n        const nodeRef = this.doc.context.register(node.dict);\n        parent.addField(nodeRef);\n        nonTerminal = [node, nodeRef];\n      }\n    }\n    return nonTerminal;\n  }\n\n  private findNonTerminal(\n    partialName: string,\n    parent: PDFAcroForm | PDFAcroNonTerminal,\n  ): [PDFAcroNonTerminal, PDFRef] | undefined {\n    const fields =\n      parent instanceof PDFAcroForm\n        ? this.acroForm.getFields()\n        : createPDFAcroFields(parent.Kids());\n\n    for (let idx = 0, len = fields.length; idx < len; idx++) {\n      const [field, ref] = fields[idx];\n      if (field.getPartialName() === partialName) {\n        if (field instanceof PDFAcroNonTerminal) return [field, ref];\n        throw new FieldAlreadyExistsError(partialName);\n      }\n    }\n\n    return undefined;\n  }\n\n  private embedDefaultFont = (): PDFFont =>\n    this.doc.embedStandardFont(StandardFonts.Helvetica);\n}\n\nconst convertToPDFField = (\n  field: PDFAcroField,\n  ref: PDFRef,\n  doc: PDFDocument,\n): PDFField | undefined => {\n  if (field instanceof PDFAcroPushButton) return PDFButton.of(field, ref, doc);\n  if (field instanceof PDFAcroCheckBox) return PDFCheckBox.of(field, ref, doc);\n  if (field instanceof PDFAcroComboBox) return PDFDropdown.of(field, ref, doc);\n  if (field instanceof PDFAcroListBox) return PDFOptionList.of(field, ref, doc);\n  if (field instanceof PDFAcroText) return PDFTextField.of(field, ref, doc);\n  if (field instanceof PDFAcroRadioButton) {\n    return PDFRadioGroup.of(field, ref, doc);\n  }\n  if (field instanceof PDFAcroSignature) {\n    return PDFSignature.of(field, ref, doc);\n  }\n  return undefined;\n};\n\nconst splitFieldName = (fullyQualifiedName: string) => {\n  if (fullyQualifiedName.length === 0) {\n    throw new Error('PDF field names must not be empty strings');\n  }\n\n  const parts = fullyQualifiedName.split('.');\n\n  for (let idx = 0, len = parts.length; idx < len; idx++) {\n    if (parts[idx] === '') {\n      throw new Error(\n        `Periods in PDF field names must be separated by at least one character: \"${fullyQualifiedName}\"`,\n      );\n    }\n  }\n\n  if (parts.length === 1) return { nonTerminal: [], terminal: parts[0] };\n\n  return {\n    nonTerminal: parts.slice(0, parts.length - 1),\n    terminal: parts[parts.length - 1],\n  };\n};\n\nconst addFieldToParent = (\n  [parent, parentRef]: [PDFAcroForm] | [PDFAcroNonTerminal, PDFRef],\n  [field, fieldRef]: [PDFAcroField, PDFRef],\n  partialName: string,\n) => {\n  const entries = parent.normalizedEntries();\n  const fields = createPDFAcroFields(\n    'Kids' in entries ? entries.Kids : entries.Fields,\n  );\n  for (let idx = 0, len = fields.length; idx < len; idx++) {\n    if (fields[idx][0].getPartialName() === partialName) {\n      throw new FieldAlreadyExistsError(partialName);\n    }\n  }\n  parent.addField(fieldRef);\n  field.setParent(parentRef);\n};\n","import PDFDocument from 'src/api/PDFDocument';\nimport PDFPage from 'src/api/PDFPage';\nimport PDFFont from 'src/api/PDFFont';\nimport PDFField, {\n  FieldAppearanceOptions,\n  assertFieldAppearanceOptions,\n} from 'src/api/form/PDFField';\nimport {\n  AppearanceProviderFor,\n  normalizeAppearance,\n  defaultOptionListAppearanceProvider,\n} from 'src/api/form/appearances';\nimport { rgb } from 'src/api/colors';\nimport { degrees } from 'src/api/rotations';\n\nimport {\n  PDFRef,\n  PDFHexString,\n  PDFString,\n  PDFStream,\n  PDFAcroListBox,\n  AcroChoiceFlags,\n  PDFWidgetAnnotation,\n} from 'src/core';\nimport {\n  assertIs,\n  assertIsSubset,\n  assertOrUndefined,\n  assertPositive,\n} from 'src/utils';\n\n/**\n * Represents an option list field of a [[PDFForm]].\n *\n * [[PDFOptionList]] fields are interactive lists of options. The purpose of an\n * option list is to enable users to select one or more options from a set of\n * possible options. Users are able to see the full set of options without\n * first having to click on the field (though scrolling may be necessary).\n * Clicking an option in the list will cause it to be selected and displayed\n * with a highlighted background. Some option lists allow users to select\n * more than one option (see [[PDFOptionList.isMultiselect]]).\n */\nexport default class PDFOptionList extends PDFField {\n  /**\n   * > **NOTE:** You probably don't want to call this method directly. Instead,\n   * > consider using the [[PDFForm.getOptionList]] method, which will create\n   * > an instance of [[PDFOptionList]] for you.\n   *\n   * Create an instance of [[PDFOptionList]] from an existing acroListBox and\n   * ref\n   *\n   * @param acroComboBox The underlying `PDFAcroListBox` for this option list.\n   * @param ref The unique reference for this option list.\n   * @param doc The document to which this option list will belong.\n   */\n  static of = (acroListBox: PDFAcroListBox, ref: PDFRef, doc: PDFDocument) =>\n    new PDFOptionList(acroListBox, ref, doc);\n\n  /** The low-level PDFAcroListBox wrapped by this option list. */\n  readonly acroField: PDFAcroListBox;\n\n  private constructor(\n    acroListBox: PDFAcroListBox,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) {\n    super(acroListBox, ref, doc);\n\n    assertIs(acroListBox, 'acroListBox', [[PDFAcroListBox, 'PDFAcroListBox']]);\n\n    this.acroField = acroListBox;\n  }\n\n  /**\n   * Get the list of available options for this option list. These options will\n   * be displayed to users who view this option list in a PDF reader.\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * const options = optionList.getOptions()\n   * console.log('Option List options:', options)\n   * ```\n   * @returns The options for this option list.\n   */\n  getOptions(): string[] {\n    const rawOptions = this.acroField.getOptions();\n\n    const options = new Array<string>(rawOptions.length);\n    for (let idx = 0, len = options.length; idx < len; idx++) {\n      const { display, value } = rawOptions[idx];\n      options[idx] = (display ?? value).decodeText();\n    }\n\n    return options;\n  }\n\n  /**\n   * Get the selected options for this option list. These are the values that\n   * were selected by a human user via a PDF reader, or programatically via\n   * software.\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * const selections = optionList.getSelected()\n   * console.log('Option List selections:', selections)\n   * ```\n   * @returns The selected options for this option list.\n   */\n  getSelected(): string[] {\n    const values = this.acroField.getValues();\n\n    const selected = new Array<string>(values.length);\n    for (let idx = 0, len = values.length; idx < len; idx++) {\n      selected[idx] = values[idx].decodeText();\n    }\n\n    return selected;\n  }\n\n  /**\n   * Set the list of options that are available for this option list. These are\n   * the values that will be available for users to select when they view this\n   * option list in a PDF reader. Note that preexisting options for this\n   * option list will be removed. Only the values passed as `options` will be\n   * available to select.\n   *\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('planets.optionList')\n   * optionList.setOptions(['Earth', 'Mars', 'Pluto', 'Venus'])\n   * ```\n   *\n   * This method will mark this option list as dirty, causing its appearance\n   * streams to be updated when either [[PDFDocument.save]] or\n   * [[PDFForm.updateFieldAppearances]] is called. The updated streams will\n   * display the options this field contains inside the widgets of this text\n   * field (with selected options highlighted).\n   *\n   * **IMPORTANT:** The default font used to update appearance streams is\n   * [[StandardFonts.Helvetica]]. Note that this is a WinAnsi font. This means\n   * that encoding errors will be thrown if this field contains any options\n   * with characters outside the WinAnsi character set (the latin alphabet).\n   *\n   * Embedding a custom font and passing it to\n   * [[PDFForm.updateFieldAppearances]] or [[PDFOptionList.updateAppearances]]\n   * allows you to generate appearance streams with characters outside the\n   * latin alphabet (assuming the custom font supports them).\n   *\n   * @param options The options that should be available in this option list.\n   */\n  setOptions(options: string[]) {\n    assertIs(options, 'options', [Array]);\n\n    this.markAsDirty();\n    const optionObjects = new Array<{ value: PDFHexString }>(options.length);\n    for (let idx = 0, len = options.length; idx < len; idx++) {\n      optionObjects[idx] = { value: PDFHexString.fromText(options[idx]) };\n    }\n    this.acroField.setOptions(optionObjects);\n  }\n\n  /**\n   * Add to the list of options that are available for this option list. Users\n   * will be able to select these values in a PDF reader. In addition to the\n   * values passed as `options`, any preexisting options for this option list\n   * will still be available for users to select.\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('rockets.optionList')\n   * optionList.addOptions(['Saturn IV', 'Falcon Heavy'])\n   * ```\n   * This method will mark this option list as dirty. See\n   * [[PDFOptionList.setOptions]] for more details about what this means.\n   * @param options New options that should be available in this option list.\n   */\n  addOptions(options: string | string[]) {\n    assertIs(options, 'options', ['string', Array]);\n\n    this.markAsDirty();\n\n    const optionsArr = Array.isArray(options) ? options : [options];\n\n    const existingOptions: {\n      value: PDFString | PDFHexString;\n      display?: PDFString | PDFHexString;\n    }[] = this.acroField.getOptions();\n\n    const newOptions = new Array<{ value: PDFHexString }>(optionsArr.length);\n    for (let idx = 0, len = optionsArr.length; idx < len; idx++) {\n      newOptions[idx] = { value: PDFHexString.fromText(optionsArr[idx]) };\n    }\n\n    this.acroField.setOptions(existingOptions.concat(newOptions));\n  }\n\n  /**\n   * Select one or more values for this option list. This operation is analogous\n   * to a human user opening the option list in a PDF reader and clicking on one\n   * or more values to select them. This method will update the underlying state\n   * of the option list to indicate which values have been selected. PDF\n   * libraries and readers will be able to extract these values from the saved\n   * document and determine which values were selected.\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('best.superheroes.optionList')\n   * optionList.select(['One Punch Man', 'Iron Man'])\n   * ```\n   * This method will mark this option list as dirty. See\n   * [[PDFOptionList.setOptions]] for more details about what this means.\n   * @param options The options to be selected.\n   * @param merge Whether or not existing selections should be preserved.\n   */\n  select(options: string | string[], merge = false) {\n    assertIs(options, 'options', ['string', Array]);\n    assertIs(merge, 'merge', ['boolean']);\n\n    const optionsArr = Array.isArray(options) ? options : [options];\n\n    const validOptions = this.getOptions();\n    assertIsSubset(optionsArr, 'option', validOptions);\n\n    this.markAsDirty();\n\n    if (optionsArr.length > 1 || (optionsArr.length === 1 && merge)) {\n      this.enableMultiselect();\n    }\n\n    const values = new Array<PDFHexString>(optionsArr.length);\n    for (let idx = 0, len = optionsArr.length; idx < len; idx++) {\n      values[idx] = PDFHexString.fromText(optionsArr[idx]);\n    }\n\n    if (merge) {\n      const existingValues = this.acroField.getValues();\n      this.acroField.setValues(existingValues.concat(values));\n    } else {\n      this.acroField.setValues(values);\n    }\n  }\n\n  /**\n   * Clear all selected values for this option list. This operation is\n   * equivalent to selecting an empty list. This method will update the\n   * underlying state of the option list to indicate that no values have been\n   * selected.\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.clear()\n   * ```\n   * This method will mark this option list as dirty. See\n   * [[PDFOptionList.setOptions]] for more details about what this means.\n   */\n  clear() {\n    this.markAsDirty();\n    this.acroField.setValues([]);\n  }\n\n  /**\n   * Set the font size for the text in this field. There needs to be a\n   * default appearance string (DA) set with a font value specified\n   * for this to work. For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.setFontSize(4);\n   * ```\n   * @param fontSize The font size to set the font to.\n   */\n\n  /**\n   * Set the font size for this field. Larger font sizes will result in larger\n   * text being displayed when PDF readers render this option list. Font sizes\n   * may be integer or floating point numbers. Supplying a negative font size\n   * will cause this method to throw an error.\n   *\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.setFontSize(4)\n   * optionList.setFontSize(15.7)\n   * ```\n   *\n   * > This method depends upon the existence of a default appearance\n   * > (`/DA`) string. If this field does not have a default appearance string,\n   * > or that string does not contain a font size (via the `Tf` operator),\n   * > then this method will throw an error.\n   *\n   * @param fontSize The font size to be used when rendering text in this field.\n   */\n  setFontSize(fontSize: number) {\n    assertPositive(fontSize, 'fontSize');\n    this.acroField.setFontSize(fontSize);\n    this.markAsDirty();\n  }\n\n  /**\n   * Returns `true` if the options of this option list are always displayed\n   * in alphabetical order, irrespective of the order in which the options\n   * were added to the option list. See [[PDFOptionList.enableSorting]] and\n   * [[PDFOptionList.disableSorting]]. For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * if (optionList.isSorted()) console.log('Sorting is enabled')\n   * ```\n   * @returns Whether or not this option list is sorted.\n   */\n  isSorted(): boolean {\n    return this.acroField.hasFlag(AcroChoiceFlags.Sort);\n  }\n\n  /**\n   * Always display the options of this option list in alphabetical order,\n   * irrespective of the order in which the options were added to this option\n   * list.\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.enableSorting()\n   * ```\n   */\n  enableSorting() {\n    this.acroField.setFlagTo(AcroChoiceFlags.Sort, true);\n  }\n\n  /**\n   * Do not always display the options of this option list in alphabetical\n   * order. Instead, display the options in whichever order they were added\n   * to this option list. For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.disableSorting()\n   * ```\n   */\n  disableSorting() {\n    this.acroField.setFlagTo(AcroChoiceFlags.Sort, false);\n  }\n\n  /**\n   * Returns `true` if multiple options can be selected from this option list.\n   * See [[PDFOptionList.enableMultiselect]] and\n   * [[PDFOptionList.disableMultiselect]]. For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * if (optionList.isMultiselect()) console.log('Multiselect is enabled')\n   * ```\n   * @returns Whether or not multiple options can be selected.\n   */\n  isMultiselect(): boolean {\n    return this.acroField.hasFlag(AcroChoiceFlags.MultiSelect);\n  }\n\n  /**\n   * Allow users to select more than one option from this option list.\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.enableMultiselect()\n   * ```\n   */\n  enableMultiselect() {\n    this.acroField.setFlagTo(AcroChoiceFlags.MultiSelect, true);\n  }\n\n  /**\n   * Do not allow users to select more than one option from this option list.\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.disableMultiselect()\n   * ```\n   */\n  disableMultiselect() {\n    this.acroField.setFlagTo(AcroChoiceFlags.MultiSelect, false);\n  }\n\n  /**\n   * Returns `true` if the option selected by a user is stored, or \"committed\",\n   * when the user clicks the option. The alternative is that the user's\n   * selection is stored when the user leaves this option list field (by\n   * clicking outside of it - on another field, for example). See\n   * [[PDFOptionList.enableSelectOnClick]] and\n   * [[PDFOptionList.disableSelectOnClick]]. For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * if (optionList.isSelectOnClick()) console.log('Select on click is enabled')\n   * ```\n   * @returns Whether or not options are selected immediately after they are\n   *          clicked.\n   */\n  isSelectOnClick(): boolean {\n    return this.acroField.hasFlag(AcroChoiceFlags.CommitOnSelChange);\n  }\n\n  /**\n   * Store the option selected by a user immediately after the user clicks the\n   * option. Do not wait for the user to leave this option list field (by\n   * clicking outside of it - on another field, for example). For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.enableSelectOnClick()\n   * ```\n   */\n  enableSelectOnClick() {\n    this.acroField.setFlagTo(AcroChoiceFlags.CommitOnSelChange, true);\n  }\n\n  /**\n   * Wait to store the option selected by a user until they leave this option\n   * list field (by clicking outside of it - on another field, for example).\n   * For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.disableSelectOnClick()\n   * ```\n   */\n  disableSelectOnClick() {\n    this.acroField.setFlagTo(AcroChoiceFlags.CommitOnSelChange, false);\n  }\n\n  /**\n   * Show this option list on the specified page. For example:\n   * ```js\n   * const ubuntuFont = await pdfDoc.embedFont(ubuntuFontBytes)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const optionList = form.createOptionList('best.gundams')\n   * optionList.setOptions(['Exia', 'Dynames', 'Kyrios', 'Virtue'])\n   * optionList.select(['Exia', 'Virtue'])\n   *\n   * optionList.addToPage(page, {\n   *   x: 50,\n   *   y: 75,\n   *   width: 200,\n   *   height: 100,\n   *   textColor: rgb(1, 0, 0),\n   *   backgroundColor: rgb(0, 1, 0),\n   *   borderColor: rgb(0, 0, 1),\n   *   borderWidth: 2,\n   *   rotate: degrees(90),\n   *   font: ubuntuFont,\n   * })\n   * ```\n   * This will create a new widget for this option list field.\n   * @param page The page to which this option list widget should be added.\n   * @param options The options to be used when adding this option list widget.\n   */\n  addToPage(page: PDFPage, options?: FieldAppearanceOptions) {\n    assertIs(page, 'page', [[PDFPage, 'PDFPage']]);\n    assertFieldAppearanceOptions(options);\n\n    if (!options) options = {};\n\n    if (!('textColor' in options)) options.textColor = rgb(0, 0, 0);\n    if (!('backgroundColor' in options)) options.backgroundColor = rgb(1, 1, 1);\n    if (!('borderColor' in options)) options.borderColor = rgb(0, 0, 0);\n    if (!('borderWidth' in options)) options.borderWidth = 1;\n\n    // Create a widget for this option list\n    const widget = this.createWidget({\n      x: options.x ?? 0,\n      y: options.y ?? 0,\n      width: options.width ?? 200,\n      height: options.height ?? 100,\n      textColor: options.textColor,\n      backgroundColor: options.backgroundColor,\n      borderColor: options.borderColor,\n      borderWidth: options.borderWidth ?? 0,\n      rotate: options.rotate ?? degrees(0),\n      hidden: options.hidden,\n      page: page.ref,\n    });\n    const widgetRef = this.doc.context.register(widget.dict);\n\n    // Add widget to this field\n    this.acroField.addWidget(widgetRef);\n\n    // Set appearance streams for widget\n    const font = options.font ?? this.doc.getForm().getDefaultFont();\n    this.updateWidgetAppearance(widget, font);\n\n    // Add widget to the given page\n    page.node.addAnnot(widgetRef);\n  }\n\n  /**\n   * Returns `true` if this option list has been marked as dirty, or if any of\n   * this option list's widgets do not have an appearance stream. For example:\n   * ```js\n   * const optionList = form.getOptionList('some.optionList.field')\n   * if (optionList.needsAppearancesUpdate()) console.log('Needs update')\n   * ```\n   * @returns Whether or not this option list needs an appearance update.\n   */\n  needsAppearancesUpdate(): boolean {\n    if (this.isDirty()) return true;\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const hasAppearances =\n        widget.getAppearances()?.normal instanceof PDFStream;\n      if (!hasAppearances) return true;\n    }\n\n    return false;\n  }\n\n  /**\n   * Update the appearance streams for each of this option list's widgets using\n   * the default appearance provider for option lists. For example:\n   * ```js\n   * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.defaultUpdateAppearances(helvetica)\n   * ```\n   * @param font The font to be used for creating the appearance streams.\n   */\n  defaultUpdateAppearances(font: PDFFont) {\n    assertIs(font, 'font', [[PDFFont, 'PDFFont']]);\n    this.updateAppearances(font);\n  }\n\n  /**\n   * Update the appearance streams for each of this option list's widgets using\n   * the given appearance provider. If no `provider` is passed, the default\n   * appearance provider for option lists will be used. For example:\n   * ```js\n   * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const optionList = form.getOptionList('some.optionList.field')\n   * optionList.updateAppearances(helvetica, (field, widget, font) => {\n   *   ...\n   *   return drawOptionList(...)\n   * })\n   * ```\n   * @param font The font to be used for creating the appearance streams.\n   * @param provider Optionally, the appearance provider to be used for\n   *                 generating the contents of the appearance streams.\n   */\n  updateAppearances(\n    font: PDFFont,\n    provider?: AppearanceProviderFor<PDFOptionList>,\n  ) {\n    assertIs(font, 'font', [[PDFFont, 'PDFFont']]);\n    assertOrUndefined(provider, 'provider', [Function]);\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      this.updateWidgetAppearance(widget, font, provider);\n    }\n    this.markAsClean();\n  }\n\n  // getOption(index: number): string {}\n  // getSelectedIndices(): number[] {}\n  // removeOptions(option: string | string[]) {}\n  // removeIndices(option: number[]) {}\n  // deselect(options: string | string[]) {}\n  // deselectIndices(optionIndices: number[]) {}\n\n  private updateWidgetAppearance(\n    widget: PDFWidgetAnnotation,\n    font: PDFFont,\n    provider?: AppearanceProviderFor<PDFOptionList>,\n  ) {\n    const apProvider = provider ?? defaultOptionListAppearanceProvider;\n    const appearances = normalizeAppearance(apProvider(this, widget, font));\n    this.updateWidgetAppearanceWithFont(widget, font, appearances);\n  }\n}\n","import PDFDocument from 'src/api/PDFDocument';\nimport PDFPage from 'src/api/PDFPage';\nimport PDFField, {\n  FieldAppearanceOptions,\n  assertFieldAppearanceOptions,\n} from 'src/api/form/PDFField';\nimport {\n  AppearanceProviderFor,\n  normalizeAppearance,\n  defaultRadioGroupAppearanceProvider,\n} from 'src/api/form/appearances';\nimport { rgb } from 'src/api/colors';\nimport { degrees } from 'src/api/rotations';\n\nimport {\n  PDFName,\n  PDFRef,\n  PDFHexString,\n  PDFDict,\n  PDFWidgetAnnotation,\n  PDFAcroRadioButton,\n  AcroButtonFlags,\n} from 'src/core';\nimport { assertIs, assertOrUndefined, assertIsOneOf } from 'src/utils';\n\n/**\n * Represents a radio group field of a [[PDFForm]].\n *\n * [[PDFRadioGroup]] fields are collections of radio buttons. The purpose of a\n * radio group is to enable users to select one option from a set of mutually\n * exclusive choices. Each choice in a radio group is represented by a radio\n * button. Radio buttons each have two states: `on` and `off`. At most one\n * radio button in a group may be in the `on` state at any time. Users can\n * click on a radio button to select it (and thereby automatically deselect any\n * other radio button that might have already been selected). Some radio\n * groups allow users to toggle a selected radio button `off` by clicking on\n * it (see [[PDFRadioGroup.isOffToggleable]]).\n *\n * Note that some radio groups allow multiple radio buttons to be in the `on`\n * state at the same type **if** they represent the same underlying value (see\n * [[PDFRadioGroup.isMutuallyExclusive]]).\n */\nexport default class PDFRadioGroup extends PDFField {\n  /**\n   * > **NOTE:** You probably don't want to call this method directly. Instead,\n   * > consider using the [[PDFForm.getOptionList]] method, which will create an\n   * > instance of [[PDFOptionList]] for you.\n   *\n   * Create an instance of [[PDFOptionList]] from an existing acroRadioButton\n   * and ref\n   *\n   * @param acroRadioButton The underlying `PDFAcroRadioButton` for this\n   *                        radio group.\n   * @param ref The unique reference for this radio group.\n   * @param doc The document to which this radio group will belong.\n   */\n  static of = (\n    acroRadioButton: PDFAcroRadioButton,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) => new PDFRadioGroup(acroRadioButton, ref, doc);\n\n  /** The low-level PDFAcroRadioButton wrapped by this radio group. */\n  readonly acroField: PDFAcroRadioButton;\n\n  private constructor(\n    acroRadioButton: PDFAcroRadioButton,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) {\n    super(acroRadioButton, ref, doc);\n\n    assertIs(acroRadioButton, 'acroRadioButton', [\n      [PDFAcroRadioButton, 'PDFAcroRadioButton'],\n    ]);\n\n    this.acroField = acroRadioButton;\n  }\n\n  /**\n   * Get the list of available options for this radio group. Each option is\n   * represented by a radio button. These radio buttons are displayed at\n   * various locations in the document, potentially on different pages (though\n   * typically they are stacked horizontally or vertically on the same page).\n   * For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * const options = radioGroup.getOptions()\n   * console.log('Radio Group options:', options)\n   * ```\n   * @returns The options for this radio group.\n   */\n  getOptions(): string[] {\n    const exportValues = this.acroField.getExportValues();\n    if (exportValues) {\n      const exportOptions = new Array<string>(exportValues.length);\n      for (let idx = 0, len = exportValues.length; idx < len; idx++) {\n        exportOptions[idx] = exportValues[idx].decodeText();\n      }\n      return exportOptions;\n    }\n\n    const onValues = this.acroField.getOnValues();\n    const onOptions = new Array<string>(onValues.length);\n    for (let idx = 0, len = onOptions.length; idx < len; idx++) {\n      onOptions[idx] = onValues[idx].decodeText();\n    }\n    return onOptions;\n  }\n\n  /**\n   * Get the selected option for this radio group. The selected option is\n   * represented by the radio button in this group that is turned on. At most\n   * one radio button in a group can be selected. If no buttons in this group\n   * are selected, `undefined` is returned.\n   * For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * const selected = radioGroup.getSelected()\n   * console.log('Selected radio button:', selected)\n   * ```\n   * @returns The selected option for this radio group.\n   */\n  getSelected(): string | undefined {\n    const value = this.acroField.getValue();\n    if (value === PDFName.of('Off')) return undefined;\n    const exportValues = this.acroField.getExportValues();\n    if (exportValues) {\n      const onValues = this.acroField.getOnValues();\n      for (let idx = 0, len = onValues.length; idx < len; idx++) {\n        if (onValues[idx] === value) return exportValues[idx].decodeText();\n      }\n    }\n    return value.decodeText();\n  }\n\n  // // TODO: Figure out why this seems to crash Acrobat. Maybe it's because we\n  // //       aren't removing the widget reference from the page's Annots?\n  // removeOption(option: string) {\n  //   assertIs(option, 'option', ['string']);\n  //   // TODO: Assert is valid `option`!\n\n  //   const onValues = this.acroField.getOnValues();\n  //   const exportValues = this.acroField.getExportValues();\n  //   if (exportValues) {\n  //     for (let idx = 0, len = exportValues.length; idx < len; idx++) {\n  //       if (exportValues[idx].decodeText() === option) {\n  //         this.acroField.removeWidget(idx);\n  //         this.acroField.removeExportValue(idx);\n  //       }\n  //     }\n  //   } else {\n  //     for (let idx = 0, len = onValues.length; idx < len; idx++) {\n  //       const value = onValues[idx];\n  //       if (value.decodeText() === option) {\n  //         this.acroField.removeWidget(idx);\n  //         this.acroField.removeExportValue(idx);\n  //       }\n  //     }\n  //   }\n  // }\n\n  /**\n   * Select an option for this radio group. This operation is analogous to a\n   * human user clicking one of the radio buttons in this group via a PDF\n   * reader to toggle it on. This method will update the underlying state of\n   * the radio group to indicate which option has been selected. PDF libraries\n   * and readers will be able to extract this value from the saved document and\n   * determine which option was selected.\n   *\n   * For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('best.superhero.radioGroup')\n   * radioGroup.select('One Punch Man')\n   * ```\n   *\n   * This method will mark this radio group as dirty, causing its appearance\n   * streams to be updated when either [[PDFDocument.save]] or\n   * [[PDFForm.updateFieldAppearances]] is called. The updated appearance\n   * streams will display a dot inside the widget of this check box field\n   * that represents the selected option.\n   *\n   * @param option The option to be selected.\n   */\n  select(option: string) {\n    assertIs(option, 'option', ['string']);\n\n    const validOptions = this.getOptions();\n    assertIsOneOf(option, 'option', validOptions);\n\n    this.markAsDirty();\n\n    const onValues = this.acroField.getOnValues();\n    const exportValues = this.acroField.getExportValues();\n    if (exportValues) {\n      for (let idx = 0, len = exportValues.length; idx < len; idx++) {\n        if (exportValues[idx].decodeText() === option) {\n          this.acroField.setValue(onValues[idx]);\n        }\n      }\n    } else {\n      for (let idx = 0, len = onValues.length; idx < len; idx++) {\n        const value = onValues[idx];\n        if (value.decodeText() === option) this.acroField.setValue(value);\n      }\n    }\n  }\n\n  /**\n   * Clear any selected option for this dropdown. This will result in all\n   * radio buttons in this group being toggled off. This method will update\n   * the underlying state of the dropdown to indicate that no radio buttons\n   * have been selected.\n   * For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * radioGroup.clear()\n   * ```\n   * This method will mark this radio group as dirty. See\n   * [[PDFRadioGroup.select]] for more details about what this means.\n   */\n  clear() {\n    this.markAsDirty();\n    this.acroField.setValue(PDFName.of('Off'));\n  }\n\n  /**\n   * Returns `true` if users can click on radio buttons in this group to toggle\n   * them off. The alternative is that once a user clicks on a radio button\n   * to select it, the only way to deselect it is by selecting on another radio\n   * button in the group. See [[PDFRadioGroup.enableOffToggling]] and\n   * [[PDFRadioGroup.disableOffToggling]]. For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * if (radioGroup.isOffToggleable()) console.log('Off toggling is enabled')\n   * ```\n   */\n  isOffToggleable() {\n    return !this.acroField.hasFlag(AcroButtonFlags.NoToggleToOff);\n  }\n\n  /**\n   * Allow users to click on selected radio buttons in this group to toggle\n   * them off. For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * radioGroup.enableOffToggling()\n   * ```\n   * > **NOTE:** This feature is documented in the PDF specification\n   * > (Table 226). However, most PDF readers do not respect this option and\n   * > prevent users from toggling radio buttons off even when it is enabled.\n   * > At the time of this writing (9/6/2020) Mac's Preview software did\n   * > respect the option. Adobe Acrobat, Foxit Reader, and Google Chrome did\n   * > not.\n   */\n  enableOffToggling() {\n    this.acroField.setFlagTo(AcroButtonFlags.NoToggleToOff, false);\n  }\n\n  /**\n   * Prevent users from clicking on selected radio buttons in this group to\n   * toggle them off. Clicking on a selected radio button will have no effect.\n   * The only way to deselect a selected radio button is to click on a\n   * different radio button in the group. For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * radioGroup.disableOffToggling()\n   * ```\n   */\n  disableOffToggling() {\n    this.acroField.setFlagTo(AcroButtonFlags.NoToggleToOff, true);\n  }\n\n  /**\n   * Returns `true` if the radio buttons in this group are mutually exclusive.\n   * This means that when the user selects a radio button, only that specific\n   * button will be turned on. Even if other radio buttons in the group\n   * represent the same value, they will not be enabled. The alternative to\n   * this is that clicking a radio button will select that button along with\n   * any other radio buttons in the group that share the same value. See\n   * [[PDFRadioGroup.enableMutualExclusion]] and\n   * [[PDFRadioGroup.disableMutualExclusion]].\n   * For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * if (radioGroup.isMutuallyExclusive()) console.log('Mutual exclusion is enabled')\n   * ```\n   */\n  isMutuallyExclusive() {\n    return !this.acroField.hasFlag(AcroButtonFlags.RadiosInUnison);\n  }\n\n  /**\n   * When the user clicks a radio button in this group it will be selected. In\n   * addition, any other radio buttons in this group that share the same\n   * underlying value will also be selected. For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * radioGroup.enableMutualExclusion()\n   * ```\n   * Note that this option must be enabled prior to adding options to the\n   * radio group. It does not currently apply retroactively to existing\n   * radio buttons in the group.\n   */\n  enableMutualExclusion() {\n    this.acroField.setFlagTo(AcroButtonFlags.RadiosInUnison, false);\n  }\n\n  /**\n   * When the user clicks a radio button in this group only it will be selected.\n   * No other radio buttons in the group will be selected, even if they share\n   * the same underlying value. For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * radioGroup.disableMutualExclusion()\n   * ```\n   * Note that this option must be disabled prior to adding options to the\n   * radio group. It does not currently apply retroactively to existing\n   * radio buttons in the group.\n   */\n  disableMutualExclusion() {\n    this.acroField.setFlagTo(AcroButtonFlags.RadiosInUnison, true);\n  }\n\n  /**\n   * Add a new radio button to this group on the specified page. For example:\n   * ```js\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const radioGroup = form.createRadioGroup('best.gundam')\n   *\n   * const options = {\n   *   x: 50,\n   *   width: 25,\n   *   height: 25,\n   *   textColor: rgb(1, 0, 0),\n   *   backgroundColor: rgb(0, 1, 0),\n   *   borderColor: rgb(0, 0, 1),\n   *   borderWidth: 2,\n   *   rotate: degrees(90),\n   * }\n   *\n   * radioGroup.addOptionToPage('Exia', page, { ...options, y: 50 })\n   * radioGroup.addOptionToPage('Dynames', page, { ...options, y: 110 })\n   * ```\n   * This will create a new radio button widget for this radio group field.\n   * @param option The option that the radio button widget represents.\n   * @param page The page to which the radio button widget should be added.\n   * @param options The options to be used when adding the radio button widget.\n   */\n  addOptionToPage(\n    option: string,\n    page: PDFPage,\n    options?: FieldAppearanceOptions,\n  ) {\n    assertIs(option, 'option', ['string']);\n    assertIs(page, 'page', [[PDFPage, 'PDFPage']]);\n    assertFieldAppearanceOptions(options);\n\n    // Create a widget for this radio button\n    const widget = this.createWidget({\n      x: options?.x ?? 0,\n      y: options?.y ?? 0,\n      width: options?.width ?? 50,\n      height: options?.height ?? 50,\n      textColor: options?.textColor ?? rgb(0, 0, 0),\n      backgroundColor: options?.backgroundColor ?? rgb(1, 1, 1),\n      borderColor: options?.borderColor ?? rgb(0, 0, 0),\n      borderWidth: options?.borderWidth ?? 1,\n      rotate: options?.rotate ?? degrees(0),\n      hidden: options?.hidden,\n      page: page.ref,\n    });\n    const widgetRef = this.doc.context.register(widget.dict);\n\n    // Add widget to this field\n    const apStateValue = this.acroField.addWidgetWithOpt(\n      widgetRef,\n      PDFHexString.fromText(option),\n      !this.isMutuallyExclusive(),\n    );\n\n    // Set appearance streams for widget\n    widget.setAppearanceState(PDFName.of('Off'));\n    this.updateWidgetAppearance(widget, apStateValue);\n\n    // Add widget to the given page\n    page.node.addAnnot(widgetRef);\n  }\n\n  /**\n   * Returns `true` if any of this group's radio button widgets do not have an\n   * appearance stream for their current state. For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * if (radioGroup.needsAppearancesUpdate()) console.log('Needs update')\n   * ```\n   * @returns Whether or not this radio group needs an appearance update.\n   */\n  needsAppearancesUpdate(): boolean {\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const state = widget.getAppearanceState();\n      const normal = widget.getAppearances()?.normal;\n\n      if (!(normal instanceof PDFDict)) return true;\n      if (state && !normal.has(state)) return true;\n    }\n\n    return false;\n  }\n\n  /**\n   * Update the appearance streams for each of this group's radio button widgets\n   * using the default appearance provider for radio groups. For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * radioGroup.defaultUpdateAppearances()\n   * ```\n   */\n  defaultUpdateAppearances() {\n    this.updateAppearances();\n  }\n\n  // rg.updateAppearances((field: any, widget: any) => {\n  //   assert(field === rg);\n  //   assert(widget instanceof PDFWidgetAnnotation);\n  //   return { on: [...rectangle, ...circle], off: [...rectangle, ...circle] };\n  // });\n\n  /**\n   * Update the appearance streams for each of this group's radio button widgets\n   * using the given appearance provider. If no `provider` is passed, the\n   * default appearance provider for radio groups will be used. For example:\n   * ```js\n   * const radioGroup = form.getRadioGroup('some.radioGroup.field')\n   * radioGroup.updateAppearances((field, widget) => {\n   *   ...\n   *   return {\n   *     normal: { on: drawRadioButton(...), off: drawRadioButton(...) },\n   *     down: { on: drawRadioButton(...), off: drawRadioButton(...) },\n   *   }\n   * })\n   * ```\n   * @param provider Optionally, the appearance provider to be used for\n   *                 generating the contents of the appearance streams.\n   */\n  updateAppearances(provider?: AppearanceProviderFor<PDFRadioGroup>) {\n    assertOrUndefined(provider, 'provider', [Function]);\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const onValue = widget.getOnValue();\n      if (!onValue) continue;\n      this.updateWidgetAppearance(widget, onValue, provider);\n    }\n  }\n\n  private updateWidgetAppearance(\n    widget: PDFWidgetAnnotation,\n    onValue: PDFName,\n    provider?: AppearanceProviderFor<PDFRadioGroup>,\n  ) {\n    const apProvider = provider ?? defaultRadioGroupAppearanceProvider;\n    const appearances = normalizeAppearance(apProvider(this, widget));\n    this.updateOnOffWidgetAppearance(widget, onValue, appearances);\n  }\n}\n","import PDFDocument from 'src/api/PDFDocument';\nimport PDFField from 'src/api/form/PDFField';\n\nimport { PDFRef, PDFAcroSignature } from 'src/core';\nimport { assertIs } from 'src/utils';\n\n/**\n * Represents a signature field of a [[PDFForm]].\n *\n * [[PDFSignature]] fields are digital signatures. `pdf-lib` does not\n * currently provide any specialized APIs for creating digital signatures or\n * reading the contents of existing digital signatures.\n */\nexport default class PDFSignature extends PDFField {\n  /**\n   * > **NOTE:** You probably don't want to call this method directly. Instead,\n   * > consider using the [[PDFForm.getSignature]] method, which will create an\n   * > instance of [[PDFSignature]] for you.\n   *\n   * Create an instance of [[PDFSignature]] from an existing acroSignature and\n   * ref\n   *\n   * @param acroSignature The underlying `PDFAcroSignature` for this signature.\n   * @param ref The unique reference for this signature.\n   * @param doc The document to which this signature will belong.\n   */\n  static of = (\n    acroSignature: PDFAcroSignature,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) => new PDFSignature(acroSignature, ref, doc);\n\n  /** The low-level PDFAcroSignature wrapped by this signature. */\n  readonly acroField: PDFAcroSignature;\n\n  private constructor(\n    acroSignature: PDFAcroSignature,\n    ref: PDFRef,\n    doc: PDFDocument,\n  ) {\n    super(acroSignature, ref, doc);\n\n    assertIs(acroSignature, 'acroSignature', [\n      [PDFAcroSignature, 'PDFAcroSignature'],\n    ]);\n\n    this.acroField = acroSignature;\n  }\n\n  needsAppearancesUpdate() {\n    return false;\n  }\n}\n","import PDFDocument from 'src/api/PDFDocument';\nimport PDFPage from 'src/api/PDFPage';\nimport PDFFont from 'src/api/PDFFont';\nimport PDFImage from 'src/api/PDFImage';\nimport PDFField, {\n  FieldAppearanceOptions,\n  assertFieldAppearanceOptions,\n} from 'src/api/form/PDFField';\nimport {\n  AppearanceProviderFor,\n  normalizeAppearance,\n  defaultTextFieldAppearanceProvider,\n} from 'src/api/form/appearances';\nimport { rgb } from 'src/api/colors';\nimport { degrees } from 'src/api/rotations';\nimport {\n  RichTextFieldReadError,\n  ExceededMaxLengthError,\n  InvalidMaxLengthError,\n} from 'src/api/errors';\nimport { ImageAlignment } from 'src/api/image/alignment';\nimport { TextAlignment } from 'src/api/text/alignment';\n\nimport {\n  PDFHexString,\n  PDFRef,\n  PDFStream,\n  PDFAcroText,\n  AcroTextFlags,\n  PDFWidgetAnnotation,\n} from 'src/core';\nimport {\n  assertIs,\n  assertIsOneOf,\n  assertOrUndefined,\n  assertPositive,\n  assertRangeOrUndefined,\n} from 'src/utils';\n\n/**\n * Represents a text field of a [[PDFForm]].\n *\n * [[PDFTextField]] fields are boxes that display text entered by the user. The\n * purpose of a text field is to enable users to enter text or view text values\n * in the document prefilled by software. Users can click on a text field and\n * input text via their keyboard. Some text fields allow multiple lines of text\n * to be entered (see [[PDFTextField.isMultiline]]).\n */\nexport default class PDFTextField extends PDFField {\n  /**\n   * > **NOTE:** You probably don't want to call this method directly. Instead,\n   * > consider using the [[PDFForm.getTextField]] method, which will create an\n   * > instance of [[PDFTextField]] for you.\n   *\n   * Create an instance of [[PDFTextField]] from an existing acroText and ref\n   *\n   * @param acroText The underlying `PDFAcroText` for this text field.\n   * @param ref The unique reference for this text field.\n   * @param doc The document to which this text field will belong.\n   */\n  static of = (acroText: PDFAcroText, ref: PDFRef, doc: PDFDocument) =>\n    new PDFTextField(acroText, ref, doc);\n\n  /** The low-level PDFAcroText wrapped by this text field. */\n  readonly acroField: PDFAcroText;\n\n  private constructor(acroText: PDFAcroText, ref: PDFRef, doc: PDFDocument) {\n    super(acroText, ref, doc);\n\n    assertIs(acroText, 'acroText', [[PDFAcroText, 'PDFAcroText']]);\n\n    this.acroField = acroText;\n  }\n\n  /**\n   * Get the text that this field contains. This text is visible to users who\n   * view this field in a PDF reader.\n   *\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * const text = textField.getText()\n   * console.log('Text field contents:', text)\n   * ```\n   *\n   * Note that if this text field contains no underlying value, `undefined`\n   * will be returned. Text fields may also contain an underlying value that\n   * is simply an empty string (`''`). This detail is largely irrelevant for\n   * most applications. In general, you'll want to treat both cases the same\n   * way and simply consider the text field to be empty. In either case, the\n   * text field will appear empty to users when viewed in a PDF reader.\n   *\n   * An error will be thrown if this is a rich text field. `pdf-lib` does not\n   * support reading rich text fields. Nor do most PDF readers and writers.\n   * Rich text fields are based on XFA (XML Forms Architecture). Relatively few\n   * PDFs use rich text fields or XFA. Unlike PDF itself, XFA is not an ISO\n   * standard. XFA has been deprecated in PDF 2.0:\n   * * https://en.wikipedia.org/wiki/XFA\n   * * http://blog.pdfshareforms.com/pdf-2-0-release-bid-farewell-xfa-forms/\n   *\n   * @returns The text contained in this text field.\n   */\n  getText(): string | undefined {\n    const value = this.acroField.getValue();\n    if (!value && this.isRichFormatted()) {\n      throw new RichTextFieldReadError(this.getName());\n    }\n    return value?.decodeText();\n  }\n\n  /**\n   * Set the text for this field. This operation is analogous to a human user\n   * clicking on the text field in a PDF reader and typing in text via their\n   * keyboard. This method will update the underlying state of the text field\n   * to indicate what text has been set. PDF libraries and readers will be able\n   * to extract these values from the saved document and determine what text\n   * was set.\n   *\n   * For example:\n   * ```js\n   * const textField = form.getTextField('best.superhero.text.field')\n   * textField.setText('One Punch Man')\n   * ```\n   *\n   * This method will mark this text field as dirty, causing its appearance\n   * streams to be updated when either [[PDFDocument.save]] or\n   * [[PDFForm.updateFieldAppearances]] is called. The updated streams will\n   * display the text this field contains inside the widgets of this text\n   * field.\n   *\n   * **IMPORTANT:** The default font used to update appearance streams is\n   * [[StandardFonts.Helvetica]]. Note that this is a WinAnsi font. This means\n   * that encoding errors will be thrown if this field contains text outside\n   * the WinAnsi character set (the latin alphabet).\n   *\n   * Embedding a custom font and passing it to\n   * [[PDFForm.updateFieldAppearances]] or [[PDFTextField.updateAppearances]]\n   * allows you to generate appearance streams with characters outside the\n   * latin alphabet (assuming the custom font supports them).\n   *\n   * If this is a rich text field, it will be converted to a standard text\n   * field in order to set the text. `pdf-lib` does not support writing rich\n   * text strings. Nor do most PDF readers and writers. See\n   * [[PDFTextField.getText]] for more information about rich text fields and\n   * their deprecation in PDF 2.0.\n   *\n   * @param text The text this field should contain.\n   */\n  setText(text: string | undefined) {\n    assertOrUndefined(text, 'text', ['string']);\n\n    const maxLength = this.getMaxLength();\n    if (maxLength !== undefined && text && text.length > maxLength) {\n      throw new ExceededMaxLengthError(text.length, maxLength, this.getName());\n    }\n\n    this.markAsDirty();\n    this.disableRichFormatting();\n\n    if (text) {\n      this.acroField.setValue(PDFHexString.fromText(text));\n    } else {\n      this.acroField.removeValue();\n    }\n  }\n\n  /**\n   * Get the alignment for this text field. This value represents the\n   * justification of the text when it is displayed to the user in PDF readers.\n   * There are three possible alignments: left, center, and right. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * const alignment = textField.getAlignment()\n   * if (alignment === TextAlignment.Left) console.log('Text is left justified')\n   * if (alignment === TextAlignment.Center) console.log('Text is centered')\n   * if (alignment === TextAlignment.Right) console.log('Text is right justified')\n   * ```\n   * @returns The alignment of this text field.\n   */\n  getAlignment(): TextAlignment {\n    const quadding = this.acroField.getQuadding();\n\n    // prettier-ignore\n    return (\n        quadding === 0 ? TextAlignment.Left\n      : quadding === 1 ? TextAlignment.Center\n      : quadding === 2 ? TextAlignment.Right\n      : TextAlignment.Left\n    );\n  }\n\n  /**\n   * Set the alignment for this text field. This will determine the\n   * justification of the text when it is displayed to the user in PDF readers.\n   * There are three possible alignments: left, center, and right. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   *\n   * // Text will be left justified when displayed\n   * textField.setAlignment(TextAlignment.Left)\n   *\n   * // Text will be centered when displayed\n   * textField.setAlignment(TextAlignment.Center)\n   *\n   * // Text will be right justified when displayed\n   * textField.setAlignment(TextAlignment.Right)\n   * ```\n   * This method will mark this text field as dirty. See\n   * [[PDFTextField.setText]] for more details about what this means.\n   * @param alignment The alignment for this text field.\n   */\n  setAlignment(alignment: TextAlignment) {\n    assertIsOneOf(alignment, 'alignment', TextAlignment);\n    this.markAsDirty();\n    this.acroField.setQuadding(alignment);\n  }\n\n  /**\n   * Get the maximum length of this field. This value represents the maximum\n   * number of characters that can be typed into this field by the user. If\n   * this field does not have a maximum length, `undefined` is returned.\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * const maxLength = textField.getMaxLength()\n   * if (maxLength === undefined) console.log('No max length')\n   * else console.log(`Max length is ${maxLength}`)\n   * ```\n   * @returns The maximum number of characters allowed in this field, or\n   *          `undefined` if no limit exists.\n   */\n  getMaxLength(): number | undefined {\n    return this.acroField.getMaxLength();\n  }\n\n  /**\n   * Set the maximum length of this field. This limits the number of characters\n   * that can be typed into this field by the user. This also limits the length\n   * of the string that can be passed to [[PDFTextField.setText]]. This limit\n   * can be removed by passing `undefined` as `maxLength`. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   *\n   * // Allow between 0 and 5 characters to be entered\n   * textField.setMaxLength(5)\n   *\n   * // Allow any number of characters to be entered\n   * textField.setMaxLength(undefined)\n   * ```\n   * This method will mark this text field as dirty. See\n   * [[PDFTextField.setText]] for more details about what this means.\n   * @param maxLength The maximum number of characters allowed in this field, or\n   *                  `undefined` to remove the limit.\n   */\n  setMaxLength(maxLength?: number) {\n    assertRangeOrUndefined(maxLength, 'maxLength', 0, Number.MAX_SAFE_INTEGER);\n\n    this.markAsDirty();\n\n    if (maxLength === undefined) {\n      this.acroField.removeMaxLength();\n    } else {\n      const text = this.getText();\n      if (text && text.length > maxLength) {\n        throw new InvalidMaxLengthError(text.length, maxLength, this.getName());\n      }\n      this.acroField.setMaxLength(maxLength);\n    }\n  }\n\n  /**\n   * Remove the maximum length for this text field. This allows any number of\n   * characters to be typed into this field by the user. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.removeMaxLength()\n   * ```\n   * Calling this method is equivalent to passing `undefined` to\n   * [[PDFTextField.setMaxLength]].\n   */\n  removeMaxLength() {\n    this.markAsDirty();\n    this.acroField.removeMaxLength();\n  }\n\n  /**\n   * Display an image inside the bounds of this text field's widgets. For example:\n   * ```js\n   * const pngImage = await pdfDoc.embedPng(...)\n   * const textField = form.getTextField('some.text.field')\n   * textField.setImage(pngImage)\n   * ```\n   * This will update the appearances streams for each of this text field's widgets.\n   * @param image The image that should be displayed.\n   */\n  setImage(image: PDFImage) {\n    const fieldAlignment = this.getAlignment();\n\n    // prettier-ignore\n    const alignment = \n        fieldAlignment === TextAlignment.Center ? ImageAlignment.Center\n      : fieldAlignment === TextAlignment.Right ? ImageAlignment.Right\n      : ImageAlignment.Left;\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const streamRef = this.createImageAppearanceStream(\n        widget,\n        image,\n        alignment,\n      );\n      this.updateWidgetAppearances(widget, { normal: streamRef });\n    }\n\n    this.markAsClean();\n  }\n\n  /**\n   * Set the font size for this field. Larger font sizes will result in larger\n   * text being displayed when PDF readers render this text field. Font sizes\n   * may be integer or floating point numbers. Supplying a negative font size\n   * will cause this method to throw an error.\n   *\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.setFontSize(4)\n   * textField.setFontSize(15.7)\n   * ```\n   *\n   * > This method depends upon the existence of a default appearance\n   * > (`/DA`) string. If this field does not have a default appearance string,\n   * > or that string does not contain a font size (via the `Tf` operator),\n   * > then this method will throw an error.\n   *\n   * @param fontSize The font size to be used when rendering text in this field.\n   */\n  setFontSize(fontSize: number) {\n    assertPositive(fontSize, 'fontSize');\n    this.acroField.setFontSize(fontSize);\n    this.markAsDirty();\n  }\n\n  /**\n   * Returns `true` if each line of text is shown on a new line when this\n   * field is displayed in a PDF reader. The alternative is that all lines of\n   * text are merged onto a single line when displayed. See\n   * [[PDFTextField.enableMultiline]] and [[PDFTextField.disableMultiline]].\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * if (textField.isMultiline()) console.log('Multiline is enabled')\n   * ```\n   * @returns Whether or not this is a multiline text field.\n   */\n  isMultiline(): boolean {\n    return this.acroField.hasFlag(AcroTextFlags.Multiline);\n  }\n\n  /**\n   * Display each line of text on a new line when this field is displayed in a\n   * PDF reader. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.enableMultiline()\n   * ```\n   * This method will mark this text field as dirty. See\n   * [[PDFTextField.setText]] for more details about what this means.\n   */\n  enableMultiline() {\n    this.markAsDirty();\n    this.acroField.setFlagTo(AcroTextFlags.Multiline, true);\n  }\n\n  /**\n   * Display each line of text on the same line when this field is displayed\n   * in a PDF reader. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.disableMultiline()\n   * ```\n   * This method will mark this text field as dirty. See\n   * [[PDFTextField.setText]] for more details about what this means.\n   */\n  disableMultiline() {\n    this.markAsDirty();\n    this.acroField.setFlagTo(AcroTextFlags.Multiline, false);\n  }\n\n  /**\n   * Returns `true` if this is a password text field. This means that the field\n   * is intended for storing a secure password. See\n   * [[PDFTextField.enablePassword]] and [[PDFTextField.disablePassword]].\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * if (textField.isPassword()) console.log('Password is enabled')\n   * ```\n   * @returns Whether or not this is a password text field.\n   */\n  isPassword(): boolean {\n    return this.acroField.hasFlag(AcroTextFlags.Password);\n  }\n\n  /**\n   * Indicate that this text field is intended for storing a secure password.\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.enablePassword()\n   * ```\n   * Values entered into password text fields should not be displayed on the\n   * screen by PDF readers. Most PDF readers will display the value as\n   * asterisks or bullets. PDF readers should never store values entered by the\n   * user into password text fields. Similarly, applications should not\n   * write data to a password text field.\n   *\n   * **Please note that this method does not cause entered values to be\n   * encrypted or secured in any way! It simply sets a flag that PDF software\n   * and readers can access to determine the _purpose_ of this field.**\n   */\n  enablePassword() {\n    this.acroField.setFlagTo(AcroTextFlags.Password, true);\n  }\n\n  /**\n   * Indicate that this text field is **not** intended for storing a secure\n   * password. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.disablePassword()\n   * ```\n   */\n  disablePassword() {\n    this.acroField.setFlagTo(AcroTextFlags.Password, false);\n  }\n\n  /**\n   * Returns `true` if the contents of this text field represent a file path.\n   * See [[PDFTextField.enableFileSelection]] and\n   * [[PDFTextField.disableFileSelection]]. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * if (textField.isFileSelector()) console.log('Is a file selector')\n   * ```\n   * @returns Whether or not this field should contain file paths.\n   */\n  isFileSelector(): boolean {\n    return this.acroField.hasFlag(AcroTextFlags.FileSelect);\n  }\n\n  /**\n   * Indicate that this text field is intended to store a file path. The\n   * contents of the file stored at that path should be submitted as the value\n   * of the field. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.enableFileSelection()\n   * ```\n   */\n  enableFileSelection() {\n    this.acroField.setFlagTo(AcroTextFlags.FileSelect, true);\n  }\n\n  /**\n   * Indicate that this text field is **not** intended to store a file path.\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.disableFileSelection()\n   * ```\n   */\n  disableFileSelection() {\n    this.acroField.setFlagTo(AcroTextFlags.FileSelect, false);\n  }\n\n  /**\n   * Returns `true` if the text entered in this field should be spell checked\n   * by PDF readers. See [[PDFTextField.enableSpellChecking]] and\n   * [[PDFTextField.disableSpellChecking]]. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * if (textField.isSpellChecked()) console.log('Spell checking is enabled')\n   * ```\n   * @returns Whether or not this field should be spell checked.\n   */\n  isSpellChecked(): boolean {\n    return !this.acroField.hasFlag(AcroTextFlags.DoNotSpellCheck);\n  }\n\n  /**\n   * Allow PDF readers to spell check the text entered in this field.\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.enableSpellChecking()\n   * ```\n   */\n  enableSpellChecking() {\n    this.acroField.setFlagTo(AcroTextFlags.DoNotSpellCheck, false);\n  }\n\n  /**\n   * Do not allow PDF readers to spell check the text entered in this field.\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.disableSpellChecking()\n   * ```\n   */\n  disableSpellChecking() {\n    this.acroField.setFlagTo(AcroTextFlags.DoNotSpellCheck, true);\n  }\n\n  /**\n   * Returns `true` if PDF readers should allow the user to scroll the text\n   * field when its contents do not fit within the field's view bounds. See\n   * [[PDFTextField.enableScrolling]] and [[PDFTextField.disableScrolling]].\n   * For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * if (textField.isScrollable()) console.log('Scrolling is enabled')\n   * ```\n   * @returns Whether or not the field is scrollable in PDF readers.\n   */\n  isScrollable(): boolean {\n    return !this.acroField.hasFlag(AcroTextFlags.DoNotScroll);\n  }\n\n  /**\n   * Allow PDF readers to present a scroll bar to the user when the contents\n   * of this text field do not fit within its view bounds. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.enableScrolling()\n   * ```\n   * A horizontal scroll bar should be shown for singleline fields. A vertical\n   * scroll bar should be shown for multiline fields.\n   */\n  enableScrolling() {\n    this.acroField.setFlagTo(AcroTextFlags.DoNotScroll, false);\n  }\n\n  /**\n   * Do not allow PDF readers to present a scroll bar to the user when the\n   * contents of this text field do not fit within its view bounds. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.disableScrolling()\n   * ```\n   */\n  disableScrolling() {\n    this.acroField.setFlagTo(AcroTextFlags.DoNotScroll, true);\n  }\n\n  /**\n   * Returns `true` if this is a combed text field. This means that the field\n   * is split into `n` equal size cells with one character in each (where `n`\n   * is equal to the max length of the text field). The result is that all\n   * characters in this field are displayed an equal distance apart from one\n   * another. See [[PDFTextField.enableCombing]] and\n   * [[PDFTextField.disableCombing]]. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * if (textField.isCombed()) console.log('Combing is enabled')\n   * ```\n   * Note that in order for a text field to be combed, the following must be\n   * true (in addition to enabling combing):\n   * * It must not be a multiline field (see [[PDFTextField.isMultiline]])\n   * * It must not be a password field (see [[PDFTextField.isPassword]])\n   * * It must not be a file selector field (see [[PDFTextField.isFileSelector]])\n   * * It must have a max length defined (see [[PDFTextField.setMaxLength]])\n   * @returns Whether or not this field is combed.\n   */\n  isCombed(): boolean {\n    return (\n      this.acroField.hasFlag(AcroTextFlags.Comb) &&\n      !this.isMultiline() &&\n      !this.isPassword() &&\n      !this.isFileSelector() &&\n      this.getMaxLength() !== undefined\n    );\n  }\n\n  /**\n   * Split this field into `n` equal size cells with one character in each\n   * (where `n` is equal to the max length of the text field). This will cause\n   * all characters in the field to be displayed an equal distance apart from\n   * one another. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.enableCombing()\n   * ```\n   *\n   * In addition to calling this method, text fields must have a max length\n   * defined in order to be combed (see [[PDFTextField.setMaxLength]]).\n   *\n   * This method will also call the following three methods internally:\n   * * [[PDFTextField.disableMultiline]]\n   * * [[PDFTextField.disablePassword]]\n   * * [[PDFTextField.disableFileSelection]]\n   *\n   * This method will mark this text field as dirty. See\n   * [[PDFTextField.setText]] for more details about what this means.\n   */\n  enableCombing() {\n    if (this.getMaxLength() === undefined) {\n      const msg = `PDFTextFields must have a max length in order to be combed`;\n      console.warn(msg);\n    }\n\n    this.markAsDirty();\n\n    this.disableMultiline();\n    this.disablePassword();\n    this.disableFileSelection();\n\n    this.acroField.setFlagTo(AcroTextFlags.Comb, true);\n  }\n\n  /**\n   * Turn off combing for this text field. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.disableCombing()\n   * ```\n   * See [[PDFTextField.isCombed]] and [[PDFTextField.enableCombing]] for more\n   * information about what combing is.\n   *\n   * This method will mark this text field as dirty. See\n   * [[PDFTextField.setText]] for more details about what this means.\n   */\n  disableCombing() {\n    this.markAsDirty();\n    this.acroField.setFlagTo(AcroTextFlags.Comb, false);\n  }\n\n  /**\n   * Returns `true` if this text field contains rich text. See\n   * [[PDFTextField.enableRichFormatting]] and\n   * [[PDFTextField.disableRichFormatting]]. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * if (textField.isRichFormatted()) console.log('Rich formatting enabled')\n   * ```\n   * @returns Whether or not this field contains rich text.\n   */\n  isRichFormatted(): boolean {\n    return this.acroField.hasFlag(AcroTextFlags.RichText);\n  }\n\n  /**\n   * Indicate that this field contains XFA data - or rich text. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.enableRichFormatting()\n   * ```\n   * Note that `pdf-lib` does not support reading or writing rich text fields.\n   * Nor do most PDF readers and writers. Rich text fields are based on XFA\n   * (XML Forms Architecture). Relatively few PDFs use rich text fields or XFA.\n   * Unlike PDF itself, XFA is not an ISO standard. XFA has been deprecated in\n   * PDF 2.0:\n   * * https://en.wikipedia.org/wiki/XFA\n   * * http://blog.pdfshareforms.com/pdf-2-0-release-bid-farewell-xfa-forms/\n   */\n  enableRichFormatting() {\n    this.acroField.setFlagTo(AcroTextFlags.RichText, true);\n  }\n\n  /**\n   * Indicate that this is a standard text field that does not XFA data (rich\n   * text). For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * textField.disableRichFormatting()\n   * ```\n   */\n  disableRichFormatting() {\n    this.acroField.setFlagTo(AcroTextFlags.RichText, false);\n  }\n\n  /**\n   * Show this text field on the specified page. For example:\n   * ```js\n   * const ubuntuFont = await pdfDoc.embedFont(ubuntuFontBytes)\n   * const page = pdfDoc.addPage()\n   *\n   * const form = pdfDoc.getForm()\n   * const textField = form.createTextField('best.gundam')\n   * textField.setText('Exia')\n   *\n   * textField.addToPage(page, {\n   *   x: 50,\n   *   y: 75,\n   *   width: 200,\n   *   height: 100,\n   *   textColor: rgb(1, 0, 0),\n   *   backgroundColor: rgb(0, 1, 0),\n   *   borderColor: rgb(0, 0, 1),\n   *   borderWidth: 2,\n   *   rotate: degrees(90),\n   *   font: ubuntuFont,\n   * })\n   * ```\n   * This will create a new widget for this text field.\n   * @param page The page to which this text field widget should be added.\n   * @param options The options to be used when adding this text field widget.\n   */\n  addToPage(page: PDFPage, options?: FieldAppearanceOptions) {\n    assertIs(page, 'page', [[PDFPage, 'PDFPage']]);\n    assertFieldAppearanceOptions(options);\n\n    if (!options) options = {};\n\n    if (!('textColor' in options)) options.textColor = rgb(0, 0, 0);\n    if (!('backgroundColor' in options)) options.backgroundColor = rgb(1, 1, 1);\n    if (!('borderColor' in options)) options.borderColor = rgb(0, 0, 0);\n    if (!('borderWidth' in options)) options.borderWidth = 1;\n\n    // Create a widget for this text field\n    const widget = this.createWidget({\n      x: options.x ?? 0,\n      y: options.y ?? 0,\n      width: options.width ?? 200,\n      height: options.height ?? 50,\n      textColor: options.textColor,\n      backgroundColor: options.backgroundColor,\n      borderColor: options.borderColor,\n      borderWidth: options.borderWidth ?? 0,\n      rotate: options.rotate ?? degrees(0),\n      hidden: options.hidden,\n      page: page.ref,\n    });\n    const widgetRef = this.doc.context.register(widget.dict);\n\n    // Add widget to this field\n    this.acroField.addWidget(widgetRef);\n\n    // Set appearance streams for widget\n    const font = options.font ?? this.doc.getForm().getDefaultFont();\n    this.updateWidgetAppearance(widget, font);\n\n    // Add widget to the given page\n    page.node.addAnnot(widgetRef);\n  }\n\n  /**\n   * Returns `true` if this text field has been marked as dirty, or if any of\n   * this text field's widgets do not have an appearance stream. For example:\n   * ```js\n   * const textField = form.getTextField('some.text.field')\n   * if (textField.needsAppearancesUpdate()) console.log('Needs update')\n   * ```\n   * @returns Whether or not this text field needs an appearance update.\n   */\n  needsAppearancesUpdate(): boolean {\n    if (this.isDirty()) return true;\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      const hasAppearances =\n        widget.getAppearances()?.normal instanceof PDFStream;\n      if (!hasAppearances) return true;\n    }\n\n    return false;\n  }\n\n  /**\n   * Update the appearance streams for each of this text field's widgets using\n   * the default appearance provider for text fields. For example:\n   * ```js\n   * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const textField = form.getTextField('some.text.field')\n   * textField.defaultUpdateAppearances(helvetica)\n   * ```\n   * @param font The font to be used for creating the appearance streams.\n   */\n  defaultUpdateAppearances(font: PDFFont) {\n    assertIs(font, 'font', [[PDFFont, 'PDFFont']]);\n    this.updateAppearances(font);\n  }\n\n  /**\n   * Update the appearance streams for each of this text field's widgets using\n   * the given appearance provider. If no `provider` is passed, the default\n   * appearance provider for text fields will be used. For example:\n   * ```js\n   * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)\n   * const textField = form.getTextField('some.text.field')\n   * textField.updateAppearances(helvetica, (field, widget, font) => {\n   *   ...\n   *   return drawTextField(...)\n   * })\n   * ```\n   * @param font The font to be used for creating the appearance streams.\n   * @param provider Optionally, the appearance provider to be used for\n   *                 generating the contents of the appearance streams.\n   */\n  updateAppearances(\n    font: PDFFont,\n    provider?: AppearanceProviderFor<PDFTextField>,\n  ) {\n    assertIs(font, 'font', [[PDFFont, 'PDFFont']]);\n    assertOrUndefined(provider, 'provider', [Function]);\n\n    const widgets = this.acroField.getWidgets();\n    for (let idx = 0, len = widgets.length; idx < len; idx++) {\n      const widget = widgets[idx];\n      this.updateWidgetAppearance(widget, font, provider);\n    }\n    this.markAsClean();\n  }\n\n  private updateWidgetAppearance(\n    widget: PDFWidgetAnnotation,\n    font: PDFFont,\n    provider?: AppearanceProviderFor<PDFTextField>,\n  ) {\n    const apProvider = provider ?? defaultTextFieldAppearanceProvider;\n    const appearances = normalizeAppearance(apProvider(this, widget, font));\n    this.updateWidgetAppearanceWithFont(widget, font, appearances);\n  }\n}\n","import { PDFOperator, PDFWidgetAnnotation } from 'src/core';\nimport PDFFont from 'src/api/PDFFont';\nimport PDFButton from 'src/api/form/PDFButton';\nimport PDFCheckBox from 'src/api/form/PDFCheckBox';\nimport PDFDropdown from 'src/api/form/PDFDropdown';\nimport PDFField from 'src/api/form/PDFField';\nimport PDFOptionList from 'src/api/form/PDFOptionList';\nimport PDFRadioGroup from 'src/api/form/PDFRadioGroup';\nimport PDFSignature from 'src/api/form/PDFSignature';\nimport PDFTextField from 'src/api/form/PDFTextField';\nimport {\n  drawCheckBox,\n  rotateInPlace,\n  drawRadioButton,\n  drawButton,\n  drawTextField,\n  drawOptionList,\n} from 'src/api/operations';\nimport {\n  rgb,\n  componentsToColor,\n  setFillingColor,\n  grayscale,\n  cmyk,\n  Color,\n} from 'src/api/colors';\nimport { reduceRotation, adjustDimsForRotation } from 'src/api/rotations';\nimport {\n  layoutMultilineText,\n  layoutCombedText,\n  TextPosition,\n  layoutSinglelineText,\n} from 'src/api/text/layout';\nimport { TextAlignment } from 'src/api/text/alignment';\nimport { setFontAndSize } from 'src/api/operators';\nimport { findLastMatch } from 'src/utils';\n\n/*********************** Appearance Provider Types ****************************/\n\ntype CheckBoxAppearanceProvider = (\n  checkBox: PDFCheckBox,\n  widget: PDFWidgetAnnotation,\n) => AppearanceOrMapping<{\n  on: PDFOperator[];\n  off: PDFOperator[];\n}>;\n\ntype RadioGroupAppearanceProvider = (\n  radioGroup: PDFRadioGroup,\n  widget: PDFWidgetAnnotation,\n) => AppearanceOrMapping<{\n  on: PDFOperator[];\n  off: PDFOperator[];\n}>;\n\ntype ButtonAppearanceProvider = (\n  button: PDFButton,\n  widget: PDFWidgetAnnotation,\n  font: PDFFont,\n) => AppearanceOrMapping<PDFOperator[]>;\n\ntype DropdownAppearanceProvider = (\n  dropdown: PDFDropdown,\n  widget: PDFWidgetAnnotation,\n  font: PDFFont,\n) => AppearanceOrMapping<PDFOperator[]>;\n\ntype OptionListAppearanceProvider = (\n  optionList: PDFOptionList,\n  widget: PDFWidgetAnnotation,\n  font: PDFFont,\n) => AppearanceOrMapping<PDFOperator[]>;\n\ntype TextFieldAppearanceProvider = (\n  textField: PDFTextField,\n  widget: PDFWidgetAnnotation,\n  font: PDFFont,\n) => AppearanceOrMapping<PDFOperator[]>;\n\ntype SignatureAppearanceProvider = (\n  signature: PDFSignature,\n  widget: PDFWidgetAnnotation,\n  font: PDFFont,\n) => AppearanceOrMapping<PDFOperator[]>;\n\n/******************* Appearance Provider Utility Types ************************/\n\nexport type AppearanceMapping<T> = { normal: T; rollover?: T; down?: T };\n\ntype AppearanceOrMapping<T> = T | AppearanceMapping<T>;\n\n// prettier-ignore\nexport type AppearanceProviderFor<T extends PDFField> = \n  T extends PDFCheckBox   ? CheckBoxAppearanceProvider\n: T extends PDFRadioGroup ? RadioGroupAppearanceProvider\n: T extends PDFButton     ? ButtonAppearanceProvider\n: T extends PDFDropdown   ? DropdownAppearanceProvider\n: T extends PDFOptionList ? OptionListAppearanceProvider\n: T extends PDFTextField  ? TextFieldAppearanceProvider\n: T extends PDFSignature  ? SignatureAppearanceProvider\n: never;\n\n/********************* Appearance Provider Functions **************************/\n\nexport const normalizeAppearance = <T>(\n  appearance: T | AppearanceMapping<T>,\n): AppearanceMapping<T> => {\n  if ('normal' in appearance) return appearance;\n  return { normal: appearance };\n};\n\n// Examples:\n//   `/Helv 12 Tf` -> ['/Helv 12 Tf', 'Helv', '12']\n//   `/HeBo 8.00 Tf` -> ['/HeBo 8 Tf', 'HeBo', '8.00']\nconst tfRegex = /\\/([^\\0\\t\\n\\f\\r\\ ]+)[\\0\\t\\n\\f\\r\\ ]+(\\d*\\.\\d+|\\d+)[\\0\\t\\n\\f\\r\\ ]+Tf/;\n\nconst getDefaultFontSize = (field: {\n  getDefaultAppearance(): string | undefined;\n}) => {\n  const da = field.getDefaultAppearance() ?? '';\n  const daMatch = findLastMatch(da, tfRegex).match ?? [];\n  const defaultFontSize = Number(daMatch[2]);\n  return isFinite(defaultFontSize) ? defaultFontSize : undefined;\n};\n\n// Examples:\n//   `0.3 g` -> ['0.3', 'g']\n//   `0.3 1 .3 rg` -> ['0.3', '1', '.3', 'rg']\n//   `0.3 1 .3 0 k` -> ['0.3', '1', '.3', '0', 'k']\nconst colorRegex = /(\\d*\\.\\d+|\\d+)[\\0\\t\\n\\f\\r\\ ]*(\\d*\\.\\d+|\\d+)?[\\0\\t\\n\\f\\r\\ ]*(\\d*\\.\\d+|\\d+)?[\\0\\t\\n\\f\\r\\ ]*(\\d*\\.\\d+|\\d+)?[\\0\\t\\n\\f\\r\\ ]+(g|rg|k)/;\n\nconst getDefaultColor = (field: {\n  getDefaultAppearance(): string | undefined;\n}) => {\n  const da = field.getDefaultAppearance() ?? '';\n  const daMatch = findLastMatch(da, colorRegex).match;\n\n  const [, c1, c2, c3, c4, colorSpace] = daMatch ?? [];\n\n  if (colorSpace === 'g' && c1) {\n    return grayscale(Number(c1));\n  }\n  if (colorSpace === 'rg' && c1 && c2 && c3) {\n    return rgb(Number(c1), Number(c2), Number(c3));\n  }\n  if (colorSpace === 'k' && c1 && c2 && c3 && c4) {\n    return cmyk(Number(c1), Number(c2), Number(c3), Number(c4));\n  }\n\n  return undefined;\n};\n\nconst updateDefaultAppearance = (\n  field: { setDefaultAppearance(appearance: string): void },\n  color: Color,\n  font?: PDFFont,\n  fontSize: number = 0,\n) => {\n  const da = [\n    setFillingColor(color).toString(),\n    setFontAndSize(font?.name ?? 'dummy__noop', fontSize).toString(),\n  ].join('\\n');\n  field.setDefaultAppearance(da);\n};\n\nexport const defaultCheckBoxAppearanceProvider: AppearanceProviderFor<PDFCheckBox> = (\n  checkBox,\n  widget,\n) => {\n  // The `/DA` entry can be at the widget or field level - so we handle both\n  const widgetColor = getDefaultColor(widget);\n  const fieldColor = getDefaultColor(checkBox.acroField);\n\n  const rectangle = widget.getRectangle();\n  const ap = widget.getAppearanceCharacteristics();\n  const bs = widget.getBorderStyle();\n\n  const borderWidth = bs?.getWidth() ?? 0;\n  const rotation = reduceRotation(ap?.getRotation());\n  const { width, height } = adjustDimsForRotation(rectangle, rotation);\n\n  const rotate = rotateInPlace({ ...rectangle, rotation });\n\n  const black = rgb(0, 0, 0);\n  const borderColor = componentsToColor(ap?.getBorderColor()) ?? black;\n  const normalBackgroundColor = componentsToColor(ap?.getBackgroundColor());\n  const downBackgroundColor = componentsToColor(ap?.getBackgroundColor(), 0.8);\n\n  // Update color\n  const textColor = widgetColor ?? fieldColor ?? black;\n  if (widgetColor) {\n    updateDefaultAppearance(widget, textColor);\n  } else {\n    updateDefaultAppearance(checkBox.acroField, textColor);\n  }\n\n  const options = {\n    x: 0 + borderWidth / 2,\n    y: 0 + borderWidth / 2,\n    width: width - borderWidth,\n    height: height - borderWidth,\n    thickness: 1.5,\n    borderWidth,\n    borderColor,\n    markColor: textColor,\n  };\n\n  return {\n    normal: {\n      on: [\n        ...rotate,\n        ...drawCheckBox({\n          ...options,\n          color: normalBackgroundColor,\n          filled: true,\n        }),\n      ],\n      off: [\n        ...rotate,\n        ...drawCheckBox({\n          ...options,\n          color: normalBackgroundColor,\n          filled: false,\n        }),\n      ],\n    },\n    down: {\n      on: [\n        ...rotate,\n        ...drawCheckBox({\n          ...options,\n          color: downBackgroundColor,\n          filled: true,\n        }),\n      ],\n      off: [\n        ...rotate,\n        ...drawCheckBox({\n          ...options,\n          color: downBackgroundColor,\n          filled: false,\n        }),\n      ],\n    },\n  };\n};\n\nexport const defaultRadioGroupAppearanceProvider: AppearanceProviderFor<PDFRadioGroup> = (\n  radioGroup,\n  widget,\n) => {\n  // The `/DA` entry can be at the widget or field level - so we handle both\n  const widgetColor = getDefaultColor(widget);\n  const fieldColor = getDefaultColor(radioGroup.acroField);\n\n  const rectangle = widget.getRectangle();\n  const ap = widget.getAppearanceCharacteristics();\n  const bs = widget.getBorderStyle();\n\n  const borderWidth = bs?.getWidth() ?? 0;\n  const rotation = reduceRotation(ap?.getRotation());\n  const { width, height } = adjustDimsForRotation(rectangle, rotation);\n\n  const rotate = rotateInPlace({ ...rectangle, rotation });\n\n  const black = rgb(0, 0, 0);\n  const borderColor = componentsToColor(ap?.getBorderColor()) ?? black;\n  const normalBackgroundColor = componentsToColor(ap?.getBackgroundColor());\n  const downBackgroundColor = componentsToColor(ap?.getBackgroundColor(), 0.8);\n\n  // Update color\n  const textColor = widgetColor ?? fieldColor ?? black;\n  if (widgetColor) {\n    updateDefaultAppearance(widget, textColor);\n  } else {\n    updateDefaultAppearance(radioGroup.acroField, textColor);\n  }\n\n  const options = {\n    x: width / 2,\n    y: height / 2,\n    width: width - borderWidth,\n    height: height - borderWidth,\n    borderWidth,\n    borderColor,\n    dotColor: textColor,\n  };\n\n  return {\n    normal: {\n      on: [\n        ...rotate,\n        ...drawRadioButton({\n          ...options,\n          color: normalBackgroundColor,\n          filled: true,\n        }),\n      ],\n      off: [\n        ...rotate,\n        ...drawRadioButton({\n          ...options,\n          color: normalBackgroundColor,\n          filled: false,\n        }),\n      ],\n    },\n    down: {\n      on: [\n        ...rotate,\n        ...drawRadioButton({\n          ...options,\n          color: downBackgroundColor,\n          filled: true,\n        }),\n      ],\n      off: [\n        ...rotate,\n        ...drawRadioButton({\n          ...options,\n          color: downBackgroundColor,\n          filled: false,\n        }),\n      ],\n    },\n  };\n};\n\nexport const defaultButtonAppearanceProvider: AppearanceProviderFor<PDFButton> = (\n  button,\n  widget,\n  font,\n) => {\n  // The `/DA` entry can be at the widget or field level - so we handle both\n  const widgetColor = getDefaultColor(widget);\n  const fieldColor = getDefaultColor(button.acroField);\n  const widgetFontSize = getDefaultFontSize(widget);\n  const fieldFontSize = getDefaultFontSize(button.acroField);\n\n  const rectangle = widget.getRectangle();\n  const ap = widget.getAppearanceCharacteristics();\n  const bs = widget.getBorderStyle();\n  const captions = ap?.getCaptions();\n  const normalText = captions?.normal ?? '';\n  const downText = captions?.down ?? normalText ?? '';\n\n  const borderWidth = bs?.getWidth() ?? 0;\n  const rotation = reduceRotation(ap?.getRotation());\n  const { width, height } = adjustDimsForRotation(rectangle, rotation);\n\n  const rotate = rotateInPlace({ ...rectangle, rotation });\n\n  const black = rgb(0, 0, 0);\n\n  const borderColor = componentsToColor(ap?.getBorderColor());\n  const normalBackgroundColor = componentsToColor(ap?.getBackgroundColor());\n  const downBackgroundColor = componentsToColor(ap?.getBackgroundColor(), 0.8);\n\n  const bounds = {\n    x: borderWidth,\n    y: borderWidth,\n    width: width - borderWidth * 2,\n    height: height - borderWidth * 2,\n  };\n  const normalLayout = layoutSinglelineText(normalText, {\n    alignment: TextAlignment.Center,\n    fontSize: widgetFontSize ?? fieldFontSize,\n    font,\n    bounds,\n  });\n  const downLayout = layoutSinglelineText(downText, {\n    alignment: TextAlignment.Center,\n    fontSize: widgetFontSize ?? fieldFontSize,\n    font,\n    bounds,\n  });\n\n  // Update font size and color\n  const fontSize = Math.min(normalLayout.fontSize, downLayout.fontSize);\n  const textColor = widgetColor ?? fieldColor ?? black;\n  if (widgetColor || widgetFontSize !== undefined) {\n    updateDefaultAppearance(widget, textColor, font, fontSize);\n  } else {\n    updateDefaultAppearance(button.acroField, textColor, font, fontSize);\n  }\n\n  const options = {\n    x: 0 + borderWidth / 2,\n    y: 0 + borderWidth / 2,\n    width: width - borderWidth,\n    height: height - borderWidth,\n    borderWidth,\n    borderColor,\n    textColor,\n    font: font.name,\n    fontSize,\n  };\n\n  return {\n    normal: [\n      ...rotate,\n      ...drawButton({\n        ...options,\n        color: normalBackgroundColor,\n        textLines: [normalLayout.line],\n      }),\n    ],\n    down: [\n      ...rotate,\n      ...drawButton({\n        ...options,\n        color: downBackgroundColor,\n        textLines: [downLayout.line],\n      }),\n    ],\n  };\n};\n\nexport const defaultTextFieldAppearanceProvider: AppearanceProviderFor<PDFTextField> = (\n  textField,\n  widget,\n  font,\n) => {\n  // The `/DA` entry can be at the widget or field level - so we handle both\n  const widgetColor = getDefaultColor(widget);\n  const fieldColor = getDefaultColor(textField.acroField);\n  const widgetFontSize = getDefaultFontSize(widget);\n  const fieldFontSize = getDefaultFontSize(textField.acroField);\n\n  const rectangle = widget.getRectangle();\n  const ap = widget.getAppearanceCharacteristics();\n  const bs = widget.getBorderStyle();\n  const text = textField.getText() ?? '';\n\n  const borderWidth = bs?.getWidth() ?? 0;\n  const rotation = reduceRotation(ap?.getRotation());\n  const { width, height } = adjustDimsForRotation(rectangle, rotation);\n\n  const rotate = rotateInPlace({ ...rectangle, rotation });\n\n  const black = rgb(0, 0, 0);\n\n  const borderColor = componentsToColor(ap?.getBorderColor());\n  const normalBackgroundColor = componentsToColor(ap?.getBackgroundColor());\n\n  let textLines: TextPosition[];\n  let fontSize: number;\n\n  const padding = textField.isCombed() ? 0 : 1;\n  const bounds = {\n    x: borderWidth + padding,\n    y: borderWidth + padding,\n    width: width - (borderWidth + padding) * 2,\n    height: height - (borderWidth + padding) * 2,\n  };\n  if (textField.isMultiline()) {\n    const layout = layoutMultilineText(text, {\n      alignment: textField.getAlignment(),\n      fontSize: widgetFontSize ?? fieldFontSize,\n      font,\n      bounds,\n    });\n    textLines = layout.lines;\n    fontSize = layout.fontSize;\n  } else if (textField.isCombed()) {\n    const layout = layoutCombedText(text, {\n      fontSize: widgetFontSize ?? fieldFontSize,\n      font,\n      bounds,\n      cellCount: textField.getMaxLength() ?? 0,\n    });\n    textLines = layout.cells;\n    fontSize = layout.fontSize;\n  } else {\n    const layout = layoutSinglelineText(text, {\n      alignment: textField.getAlignment(),\n      fontSize: widgetFontSize ?? fieldFontSize,\n      font,\n      bounds,\n    });\n    textLines = [layout.line];\n    fontSize = layout.fontSize;\n  }\n\n  // Update font size and color\n  const textColor = widgetColor ?? fieldColor ?? black;\n  if (widgetColor || widgetFontSize !== undefined) {\n    updateDefaultAppearance(widget, textColor, font, fontSize);\n  } else {\n    updateDefaultAppearance(textField.acroField, textColor, font, fontSize);\n  }\n\n  const options = {\n    x: 0 + borderWidth / 2,\n    y: 0 + borderWidth / 2,\n    width: width - borderWidth,\n    height: height - borderWidth,\n    borderWidth: borderWidth ?? 0,\n    borderColor,\n    textColor,\n    font: font.name,\n    fontSize,\n    color: normalBackgroundColor,\n    textLines,\n    padding,\n  };\n\n  return [...rotate, ...drawTextField(options)];\n};\n\nexport const defaultDropdownAppearanceProvider: AppearanceProviderFor<PDFDropdown> = (\n  dropdown,\n  widget,\n  font,\n) => {\n  // The `/DA` entry can be at the widget or field level - so we handle both\n  const widgetColor = getDefaultColor(widget);\n  const fieldColor = getDefaultColor(dropdown.acroField);\n  const widgetFontSize = getDefaultFontSize(widget);\n  const fieldFontSize = getDefaultFontSize(dropdown.acroField);\n\n  const rectangle = widget.getRectangle();\n  const ap = widget.getAppearanceCharacteristics();\n  const bs = widget.getBorderStyle();\n  const text = dropdown.getSelected()[0] ?? '';\n\n  const borderWidth = bs?.getWidth() ?? 0;\n  const rotation = reduceRotation(ap?.getRotation());\n  const { width, height } = adjustDimsForRotation(rectangle, rotation);\n\n  const rotate = rotateInPlace({ ...rectangle, rotation });\n\n  const black = rgb(0, 0, 0);\n\n  const borderColor = componentsToColor(ap?.getBorderColor());\n  const normalBackgroundColor = componentsToColor(ap?.getBackgroundColor());\n\n  const padding = 1;\n  const bounds = {\n    x: borderWidth + padding,\n    y: borderWidth + padding,\n    width: width - (borderWidth + padding) * 2,\n    height: height - (borderWidth + padding) * 2,\n  };\n  const { line, fontSize } = layoutSinglelineText(text, {\n    alignment: TextAlignment.Left,\n    fontSize: widgetFontSize ?? fieldFontSize,\n    font,\n    bounds,\n  });\n\n  // Update font size and color\n  const textColor = widgetColor ?? fieldColor ?? black;\n  if (widgetColor || widgetFontSize !== undefined) {\n    updateDefaultAppearance(widget, textColor, font, fontSize);\n  } else {\n    updateDefaultAppearance(dropdown.acroField, textColor, font, fontSize);\n  }\n\n  const options = {\n    x: 0 + borderWidth / 2,\n    y: 0 + borderWidth / 2,\n    width: width - borderWidth,\n    height: height - borderWidth,\n    borderWidth: borderWidth ?? 0,\n    borderColor,\n    textColor,\n    font: font.name,\n    fontSize,\n    color: normalBackgroundColor,\n    textLines: [line],\n    padding,\n  };\n\n  return [...rotate, ...drawTextField(options)];\n};\n\nexport const defaultOptionListAppearanceProvider: AppearanceProviderFor<PDFOptionList> = (\n  optionList,\n  widget,\n  font,\n) => {\n  // The `/DA` entry can be at the widget or field level - so we handle both\n  const widgetColor = getDefaultColor(widget);\n  const fieldColor = getDefaultColor(optionList.acroField);\n  const widgetFontSize = getDefaultFontSize(widget);\n  const fieldFontSize = getDefaultFontSize(optionList.acroField);\n\n  const rectangle = widget.getRectangle();\n  const ap = widget.getAppearanceCharacteristics();\n  const bs = widget.getBorderStyle();\n\n  const borderWidth = bs?.getWidth() ?? 0;\n  const rotation = reduceRotation(ap?.getRotation());\n  const { width, height } = adjustDimsForRotation(rectangle, rotation);\n\n  const rotate = rotateInPlace({ ...rectangle, rotation });\n\n  const black = rgb(0, 0, 0);\n\n  const borderColor = componentsToColor(ap?.getBorderColor());\n  const normalBackgroundColor = componentsToColor(ap?.getBackgroundColor());\n\n  const options = optionList.getOptions();\n  const selected = optionList.getSelected();\n\n  if (optionList.isSorted()) options.sort();\n\n  let text = '';\n  for (let idx = 0, len = options.length; idx < len; idx++) {\n    text += options[idx];\n    if (idx < len - 1) text += '\\n';\n  }\n\n  const padding = 1;\n  const bounds = {\n    x: borderWidth + padding,\n    y: borderWidth + padding,\n    width: width - (borderWidth + padding) * 2,\n    height: height - (borderWidth + padding) * 2,\n  };\n  const { lines, fontSize, lineHeight } = layoutMultilineText(text, {\n    alignment: TextAlignment.Left,\n    fontSize: widgetFontSize ?? fieldFontSize,\n    font,\n    bounds,\n  });\n\n  const selectedLines: number[] = [];\n  for (let idx = 0, len = lines.length; idx < len; idx++) {\n    const line = lines[idx];\n    if (selected.includes(line.text)) selectedLines.push(idx);\n  }\n\n  const blue = rgb(153 / 255, 193 / 255, 218 / 255);\n\n  // Update font size and color\n  const textColor = widgetColor ?? fieldColor ?? black;\n  if (widgetColor || widgetFontSize !== undefined) {\n    updateDefaultAppearance(widget, textColor, font, fontSize);\n  } else {\n    updateDefaultAppearance(optionList.acroField, textColor, font, fontSize);\n  }\n\n  return [\n    ...rotate,\n    ...drawOptionList({\n      x: 0 + borderWidth / 2,\n      y: 0 + borderWidth / 2,\n      width: width - borderWidth,\n      height: height - borderWidth,\n      borderWidth: borderWidth ?? 0,\n      borderColor,\n      textColor,\n      font: font.name,\n      fontSize,\n      color: normalBackgroundColor,\n      textLines: lines,\n      lineHeight,\n      selectedColor: blue,\n      selectedLines,\n      padding,\n    }),\n  ];\n};\n","export enum ImageAlignment {\n  Left = 0,\n  Center = 1,\n  Right = 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