govuk-frontend
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GOV.UK Frontend contains the code you need to start building a user interface for government platforms and services.
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{"version":3,"file":"file-upload.bundle.mjs","sources":["../../../../src/govuk/common/closest-attribute-value.mjs","../../../../src/govuk/common/index.mjs","../../../../src/govuk/errors/index.mjs","../../../../src/govuk/component.mjs","../../../../src/govuk/common/configuration.mjs","../../../../src/govuk/i18n.mjs","../../../../src/govuk/components/file-upload/file-upload.mjs"],"sourcesContent":["/**\n * Returns the value of the given attribute closest to the given element (including itself)\n *\n * @internal\n * @param {Element} $element - The element to start walking the DOM tree up\n * @param {string} attributeName - The name of the attribute\n * @returns {string | null} Attribute value\n */\nexport function closestAttributeValue($element, attributeName) {\n const $closestElementWithAttribute = $element.closest(`[${attributeName}]`)\n return $closestElementWithAttribute\n ? $closestElementWithAttribute.getAttribute(attributeName)\n : null\n}\n","/**\n * Common helpers which do not require polyfill.\n *\n * IMPORTANT: If a helper require a polyfill, please isolate it in its own module\n * so that the polyfill can be properly tree-shaken and does not burden\n * the components that do not need that helper\n */\n\n/**\n * Get hash fragment from URL\n *\n * Extract the hash fragment (everything after the hash) from a URL,\n * but not including the hash symbol\n *\n * @private\n * @param {string} url - URL\n * @returns {string | undefined} Fragment from URL, without the hash\n */\nexport function getFragmentFromUrl(url) {\n if (!url.includes('#')) {\n return undefined\n }\n\n return url.split('#').pop()\n}\n\n/**\n * Get GOV.UK Frontend breakpoint value from CSS custom property\n *\n * @private\n * @param {string} name - Breakpoint name\n * @returns {{ property: string, value?: string }} Breakpoint object\n */\nexport function getBreakpoint(name) {\n const property = `--govuk-breakpoint-${name}`\n\n // Get value from `<html>` with breakpoints on CSS :root\n const value = window\n .getComputedStyle(document.documentElement)\n .getPropertyValue(property)\n\n return {\n property,\n value: value || undefined\n }\n}\n\n/**\n * Move focus to element\n *\n * Sets tabindex to -1 to make the element programmatically focusable,\n * but removes it on blur as the element doesn't need to be focused again.\n *\n * @private\n * @template {HTMLElement} FocusElement\n * @param {FocusElement} $element - HTML element\n * @param {object} [options] - Handler options\n * @param {function(this: FocusElement): void} [options.onBeforeFocus] - Callback before focus\n * @param {function(this: FocusElement): void} [options.onBlur] - Callback on blur\n */\nexport function setFocus($element, options = {}) {\n const isFocusable = $element.getAttribute('tabindex')\n\n if (!isFocusable) {\n $element.setAttribute('tabindex', '-1')\n }\n\n /**\n * Handle element focus\n */\n function onFocus() {\n $element.addEventListener('blur', onBlur, { once: true })\n }\n\n /**\n * Handle element blur\n */\n function onBlur() {\n options.onBlur?.call($element)\n\n if (!isFocusable) {\n $element.removeAttribute('tabindex')\n }\n }\n\n // Add listener to reset element on blur, after focus\n $element.addEventListener('focus', onFocus, { once: true })\n\n // Focus element\n options.onBeforeFocus?.call($element)\n $element.focus()\n}\n\n/**\n * Checks if component is already initialised\n *\n * @internal\n * @param {Element} $root - HTML element to be checked\n * @param {string} moduleName - name of component module\n * @returns {boolean} Whether component is already initialised\n */\nexport function isInitialised($root, moduleName) {\n return (\n $root instanceof HTMLElement &&\n $root.hasAttribute(`data-${moduleName}-init`)\n )\n}\n\n/**\n * Checks if GOV.UK Frontend is supported on this page\n *\n * Some browsers will load and run our JavaScript but GOV.UK Frontend\n * won't be supported.\n *\n * @param {HTMLElement | null} [$scope] - (internal) `<body>` HTML element checked for browser support\n * @returns {boolean} Whether GOV.UK Frontend is supported on this page\n */\nexport function isSupported($scope = document.body) {\n if (!$scope) {\n return false\n }\n\n return $scope.classList.contains('govuk-frontend-supported')\n}\n\n/**\n * Check for an array\n *\n * @internal\n * @param {unknown} option - Option to check\n * @returns {boolean} Whether the option is an array\n */\nfunction isArray(option) {\n return Array.isArray(option)\n}\n\n/**\n * Check for an object\n *\n * @internal\n * @template {Partial<Record<keyof ObjectType, unknown>>} [ObjectType=ObjectNested]\n * @param {unknown | ObjectType} option - Option to check\n * @returns {option is ObjectType} Whether the option is an object\n */\nexport function isObject(option) {\n return !!option && typeof option === 'object' && !isArray(option)\n}\n\n/**\n * Format error message\n *\n * @internal\n * @param {ComponentWithModuleName} Component - Component that threw the error\n * @param {string} message - Error message\n * @returns {string} - Formatted error message\n */\nexport function formatErrorMessage(Component, message) {\n return `${Component.moduleName}: ${message}`\n}\n\n/* eslint-disable jsdoc/valid-types --\n * `{new(...args: any[] ): object}` is not recognised as valid\n * https://github.com/gajus/eslint-plugin-jsdoc/issues/145#issuecomment-1308722878\n * https://github.com/jsdoc-type-pratt-parser/jsdoc-type-pratt-parser/issues/131\n **/\n\n/**\n * @typedef ComponentWithModuleName\n * @property {string} moduleName - Name of the component\n */\n\n/* eslint-enable jsdoc/valid-types */\n\n/**\n * @import { ObjectNested } from './configuration.mjs'\n */\n","import { formatErrorMessage } from '../common/index.mjs'\n\n/**\n * GOV.UK Frontend error\n *\n * A base class for `Error`s thrown by GOV.UK Frontend.\n *\n * It is meant to be extended into specific types of errors\n * to be thrown by our code.\n *\n * @example\n * ```js\n * class MissingRootError extends GOVUKFrontendError {\n * // Setting an explicit name is important as extending the class will not\n * // set a new `name` on the subclass. The `name` property is important\n * // to ensure intelligible error names even if the class name gets\n * // mangled by a minifier\n * name = \"MissingRootError\"\n * }\n * ```\n * @virtual\n */\nexport class GOVUKFrontendError extends Error {\n name = 'GOVUKFrontendError'\n}\n\n/**\n * Indicates that GOV.UK Frontend is not supported\n */\nexport class SupportError extends GOVUKFrontendError {\n name = 'SupportError'\n\n /**\n * Checks if GOV.UK Frontend is supported on this page\n *\n * @param {HTMLElement | null} [$scope] - HTML element `<body>` checked for browser support\n */\n constructor($scope = document.body) {\n const supportMessage =\n 'noModule' in HTMLScriptElement.prototype\n ? 'GOV.UK Frontend initialised without `<body class=\"govuk-frontend-supported\">` from template `<script>` snippet'\n : 'GOV.UK Frontend is not supported in this browser'\n\n super(\n $scope\n ? supportMessage\n : 'GOV.UK Frontend initialised without `<script type=\"module\">`'\n )\n }\n}\n\n/**\n * Indicates that a component has received an illegal configuration\n */\nexport class ConfigError extends GOVUKFrontendError {\n name = 'ConfigError'\n}\n\n/**\n * Indicates an issue with an element (possibly `null` or `undefined`)\n */\nexport class ElementError extends GOVUKFrontendError {\n name = 'ElementError'\n\n /**\n * @internal\n * @overload\n * @param {string} message - Element error message\n */\n\n /**\n * @internal\n * @overload\n * @param {ElementErrorOptions} options - Element error options\n */\n\n /**\n * @internal\n * @param {string | ElementErrorOptions} messageOrOptions - Element error message or options\n */\n constructor(messageOrOptions) {\n let message = typeof messageOrOptions === 'string' ? messageOrOptions : ''\n\n // Build message from options\n if (typeof messageOrOptions === 'object') {\n const { component, identifier, element, expectedType } = messageOrOptions\n\n message = identifier\n\n // Append reason\n message += element\n ? ` is not of type ${expectedType ?? 'HTMLElement'}`\n : ' not found'\n\n message = formatErrorMessage(component, message)\n }\n\n super(message)\n }\n}\n\n/**\n * Indicates that a component is already initialised\n */\nexport class InitError extends GOVUKFrontendError {\n name = 'InitError'\n\n /**\n * @internal\n * @param {ComponentWithModuleName | string} componentOrMessage - name of the component module\n */\n constructor(componentOrMessage) {\n const message =\n typeof componentOrMessage === 'string'\n ? componentOrMessage\n : formatErrorMessage(\n componentOrMessage,\n `Root element (\\`$root\\`) already initialised`\n )\n\n super(message)\n }\n}\n\n/**\n * Element error options\n *\n * @internal\n * @typedef {object} ElementErrorOptions\n * @property {string} identifier - An identifier that'll let the user understand which element has an error. This is whatever makes the most sense\n * @property {Element | null} [element] - The element in error\n * @property {string} [expectedType] - The type that was expected for the identifier\n * @property {ComponentWithModuleName} component - Component throwing the error\n */\n\n/**\n * @import { ComponentWithModuleName } from '../common/index.mjs'\n */\n","import { isInitialised, isSupported } from './common/index.mjs'\nimport { ElementError, InitError, SupportError } from './errors/index.mjs'\n\n/**\n * Base Component class\n *\n * Centralises the behaviours shared by our components\n *\n * @virtual\n * @template {Element} [RootElementType=HTMLElement]\n */\nexport class Component {\n /**\n * @type {typeof Element}\n */\n static elementType = HTMLElement\n\n // allows Typescript user to work around the lack of types\n // in GOVUKFrontend package, Typescript is not aware of $root\n // in components that extend GOVUKFrontendComponent\n /**\n * Returns the root element of the component\n *\n * @protected\n * @returns {RootElementType} - the root element of component\n */\n get $root() {\n return this._$root\n }\n\n /**\n * @protected\n * @type {RootElementType}\n */\n _$root\n\n /**\n * Constructs a new component, validating that GOV.UK Frontend is supported\n *\n * @internal\n * @param {Element | null} [$root] - HTML element to use for component\n */\n constructor($root) {\n const childConstructor = /** @type {ChildClassConstructor} */ (\n this.constructor\n )\n\n // TypeScript does not enforce that inheriting classes will define a `moduleName`\n // (even if we add a `@virtual` `static moduleName` property to this class).\n // While we trust users to do this correctly, we do a little check to provide them\n // a helpful error message.\n //\n // After this, we'll be sure that `childConstructor` has a `moduleName`\n // as expected of the `ChildClassConstructor` we've cast `this.constructor` to.\n if (typeof childConstructor.moduleName !== 'string') {\n throw new InitError(`\\`moduleName\\` not defined in component`)\n }\n\n if (!($root instanceof childConstructor.elementType)) {\n throw new ElementError({\n element: $root,\n component: childConstructor,\n identifier: 'Root element (`$root`)',\n expectedType: childConstructor.elementType.name\n })\n } else {\n this._$root = /** @type {RootElementType} */ ($root)\n }\n\n childConstructor.checkSupport()\n\n this.checkInitialised()\n\n const moduleName = childConstructor.moduleName\n\n this.$root.setAttribute(`data-${moduleName}-init`, '')\n }\n\n /**\n * Validates whether component is already initialised\n *\n * @private\n * @throws {InitError} when component is already initialised\n */\n checkInitialised() {\n const constructor = /** @type {ChildClassConstructor} */ (this.constructor)\n const moduleName = constructor.moduleName\n\n if (moduleName && isInitialised(this.$root, moduleName)) {\n throw new InitError(constructor)\n }\n }\n\n /**\n * Validates whether components are supported\n *\n * @throws {SupportError} when the components are not supported\n */\n static checkSupport() {\n if (!isSupported()) {\n throw new SupportError()\n }\n }\n}\n\n/**\n * @typedef ChildClass\n * @property {string} moduleName - The module name that'll be looked for in the DOM when initialising the component\n */\n\n/**\n * @typedef {typeof Component & ChildClass} ChildClassConstructor\n */\n","import { Component } from '../component.mjs'\nimport { ConfigError } from '../errors/index.mjs'\n\nimport { isObject, formatErrorMessage } from './index.mjs'\n\nexport const configOverride = Symbol.for('configOverride')\n\n/**\n * Base Component class\n *\n * Centralises the behaviours shared by our components\n *\n * @virtual\n * @template {Partial<Record<keyof ConfigurationType, unknown>>} [ConfigurationType=ObjectNested]\n * @template {Element & { dataset: DOMStringMap }} [RootElementType=HTMLElement]\n * @augments Component<RootElementType>\n */\nexport class ConfigurableComponent extends Component {\n /**\n * configOverride\n *\n * Function which defines configuration overrides to prioritize\n * properties from the root element's dataset.\n *\n * It should take a subset of configuration as input and return\n * a new configuration object with properties that should be\n * overridden based on the root element's dataset. A Symbol\n * is used for indexing to prevent conflicts.\n *\n * @internal\n * @virtual\n * @param {Partial<ConfigurationType>} [param] - Configuration object\n * @returns {Partial<ConfigurationType>} return - Configuration object\n */\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n [configOverride](param) {\n return {}\n }\n\n /**\n * Returns the root element of the component\n *\n * @protected\n * @returns {ConfigurationType} - the root element of component\n */\n get config() {\n return this._config\n }\n\n /**\n *\n * @type {ConfigurationType}\n */\n _config\n\n /**\n * Constructs a new component, validating that GOV.UK Frontend is supported\n *\n * @internal\n * @param {Element | null} [$root] - HTML element to use for component\n * @param {ConfigurationType} [config] - HTML element to use for component\n */\n constructor($root, config) {\n super($root)\n\n const childConstructor =\n /** @type {ChildClassConstructor<ConfigurationType>} */ (this.constructor)\n\n if (!isObject(childConstructor.defaults)) {\n throw new ConfigError(\n formatErrorMessage(\n childConstructor,\n 'Config passed as parameter into constructor but no defaults defined'\n )\n )\n }\n\n const datasetConfig = /** @type {ConfigurationType} */ (\n normaliseDataset(childConstructor, this._$root.dataset)\n )\n\n this._config = /** @type {ConfigurationType} */ (\n mergeConfigs(\n childConstructor.defaults,\n config ?? {},\n this[configOverride](datasetConfig),\n datasetConfig\n )\n )\n }\n}\n\n/**\n * Normalise string\n *\n * 'If it looks like a duck, and it quacks like a duck…' 🦆\n *\n * If the passed value looks like a boolean or a number, convert it to a boolean\n * or number.\n *\n * Designed to be used to convert config passed via data attributes (which are\n * always strings) into something sensible.\n *\n * @internal\n * @param {DOMStringMap[string]} value - The value to normalise\n * @param {SchemaProperty} [property] - Component schema property\n * @returns {string | boolean | number | undefined} Normalised data\n */\nexport function normaliseString(value, property) {\n const trimmedValue = value ? value.trim() : ''\n\n let output\n let outputType = property?.type\n\n // No schema type set? Determine automatically\n if (!outputType) {\n if (['true', 'false'].includes(trimmedValue)) {\n outputType = 'boolean'\n }\n\n // Empty / whitespace-only strings are considered finite so we need to check\n // the length of the trimmed string as well\n if (trimmedValue.length > 0 && isFinite(Number(trimmedValue))) {\n outputType = 'number'\n }\n }\n\n switch (outputType) {\n case 'boolean':\n output = trimmedValue === 'true'\n break\n\n case 'number':\n output = Number(trimmedValue)\n break\n\n default:\n output = value\n }\n\n return output\n}\n\n/**\n * Normalise dataset\n *\n * Loop over an object and normalise each value using {@link normaliseString},\n * optionally expanding nested `i18n.field`\n *\n * @internal\n * @template {Partial<Record<keyof ConfigurationType, unknown>>} ConfigurationType\n * @template {[keyof ConfigurationType, SchemaProperty | undefined][]} SchemaEntryType\n * @param {{ schema?: Schema<ConfigurationType>, moduleName: string }} Component - Component class\n * @param {DOMStringMap} dataset - HTML element dataset\n * @returns {ObjectNested} Normalised dataset\n */\nexport function normaliseDataset(Component, dataset) {\n if (!isObject(Component.schema)) {\n throw new ConfigError(\n formatErrorMessage(\n Component,\n 'Config passed as parameter into constructor but no schema defined'\n )\n )\n }\n\n const out = /** @type {ObjectNested} */ ({})\n const entries = /** @type {SchemaEntryType} */ (\n Object.entries(Component.schema.properties)\n )\n\n // Normalise top-level dataset ('data-*') values using schema types\n for (const entry of entries) {\n const [namespace, property] = entry\n\n // Cast the `namespace` to string so it can be used to access the dataset\n const field = namespace.toString()\n\n if (field in dataset) {\n out[field] = normaliseString(dataset[field], property)\n }\n\n /**\n * Extract and normalise nested object values automatically using\n * {@link normaliseString} but only schema object types are allowed\n */\n if (property?.type === 'object') {\n out[field] = extractConfigByNamespace(\n Component.schema,\n dataset,\n namespace\n )\n }\n }\n\n return out\n}\n\n/**\n * Config merging function\n *\n * Takes any number of objects and combines them together, with\n * greatest priority on the LAST item passed in.\n *\n * @internal\n * @param {...{ [key: string]: unknown }} configObjects - Config objects to merge\n * @returns {{ [key: string]: unknown }} A merged config object\n */\nexport function mergeConfigs(...configObjects) {\n // Start with an empty object as our base\n /** @type {{ [key: string]: unknown }} */\n const formattedConfigObject = {}\n\n // Loop through each of the passed objects\n for (const configObject of configObjects) {\n for (const key of Object.keys(configObject)) {\n const option = formattedConfigObject[key]\n const override = configObject[key]\n\n // Push their keys one-by-one into formattedConfigObject. Any duplicate\n // keys with object values will be merged, otherwise the new value will\n // override the existing value.\n if (isObject(option) && isObject(override)) {\n formattedConfigObject[key] = mergeConfigs(option, override)\n } else {\n // Apply override\n formattedConfigObject[key] = override\n }\n }\n }\n\n return formattedConfigObject\n}\n\n/**\n * Validate component config by schema\n *\n * Follows limited examples in JSON schema for wider support in future\n *\n * {@link https://ajv.js.org/json-schema.html#compound-keywords}\n * {@link https://ajv.js.org/packages/ajv-errors.html#single-message}\n *\n * @internal\n * @template {Partial<Record<keyof ConfigurationType, unknown>>} ConfigurationType\n * @param {Schema<ConfigurationType>} schema - The schema of a component\n * @param {ConfigurationType} config - Component config\n * @returns {string[]} List of validation errors\n */\nexport function validateConfig(schema, config) {\n const validationErrors = []\n\n // Check errors for each schema\n for (const [name, conditions] of Object.entries(schema)) {\n const errors = []\n\n // Check errors for each schema condition\n if (Array.isArray(conditions)) {\n for (const { required, errorMessage } of conditions) {\n if (!required.every((key) => !!config[key])) {\n errors.push(errorMessage) // Missing config key value\n }\n }\n\n // Check one condition passes or add errors\n if (name === 'anyOf' && !(conditions.length - errors.length >= 1)) {\n validationErrors.push(...errors)\n }\n }\n }\n\n return validationErrors\n}\n\n/**\n * Extracts keys starting with a particular namespace from dataset ('data-*')\n * object, removing the namespace in the process, normalising all values\n *\n * @internal\n * @template {Partial<Record<keyof ConfigurationType, unknown>>} ConfigurationType\n * @param {Schema<ConfigurationType>} schema - The schema of a component\n * @param {DOMStringMap} dataset - The object to extract key-value pairs from\n * @param {keyof ConfigurationType} namespace - The namespace to filter keys with\n * @returns {ObjectNested | undefined} Nested object with dot-separated key namespace removed\n */\nexport function extractConfigByNamespace(schema, dataset, namespace) {\n const property = schema.properties[namespace]\n\n // Only extract configs for object schema properties\n if (property?.type !== 'object') {\n return\n }\n\n // Add default empty config\n const newObject = /** @type {Record<typeof namespace, ObjectNested>} */ ({\n [namespace]: {}\n })\n\n for (const [key, value] of Object.entries(dataset)) {\n /** @type {ObjectNested | ObjectNested[NestedKey]} */\n let current = newObject\n\n // Split the key into parts, using . as our namespace separator\n const keyParts = key.split('.')\n\n /**\n * Create new level per part\n *\n * e.g. 'i18n.textareaDescription.other' becomes\n * `{ i18n: { textareaDescription: { other } } }`\n */\n for (const [index, name] of keyParts.entries()) {\n if (isObject(current)) {\n // Drop down to nested object until the last part\n if (index < keyParts.length - 1) {\n // New nested object (optionally) replaces existing value\n if (!isObject(current[name])) {\n current[name] = {}\n }\n\n // Drop down into new or existing nested object\n current = current[name]\n } else if (key !== namespace) {\n // Normalised value (optionally) replaces existing value\n current[name] = normaliseString(value)\n }\n }\n }\n }\n\n return newObject[namespace]\n}\n\n/**\n * @internal\n * @typedef {keyof ObjectNested} NestedKey\n * @typedef {{ [key: string]: string | boolean | number | ObjectNested | undefined }} ObjectNested\n */\n\n/**\n * Schema for component config\n *\n * @template {Partial<Record<keyof ConfigurationType, unknown>>} ConfigurationType\n * @typedef {object} Schema\n * @property {Record<keyof ConfigurationType, SchemaProperty | undefined>} properties - Schema properties\n * @property {SchemaCondition<ConfigurationType>[]} [anyOf] - List of schema conditions\n */\n\n/**\n * Schema property for component config\n *\n * @typedef {object} SchemaProperty\n * @property {'string' | 'boolean' | 'number' | 'object'} type - Property type\n */\n\n/**\n * Schema condition for component config\n *\n * @template {Partial<Record<keyof ConfigurationType, unknown>>} ConfigurationType\n * @typedef {object} SchemaCondition\n * @property {(keyof ConfigurationType)[]} required - List of required config fields\n * @property {string} errorMessage - Error message when required config fields not provided\n */\n\n/**\n * @template {Partial<Record<keyof ConfigurationType, unknown>>} [ConfigurationType=ObjectNested]\n * @typedef ChildClass\n * @property {string} moduleName - The module name that'll be looked for in the DOM when initialising the component\n * @property {Schema<ConfigurationType>} [schema] - The schema of the component configuration\n * @property {ConfigurationType} [defaults] - The default values of the configuration of the component\n */\n\n/**\n * @template {Partial<Record<keyof ConfigurationType, unknown>>} [ConfigurationType=ObjectNested]\n * @typedef {typeof Component & ChildClass<ConfigurationType>} ChildClassConstructor<ConfigurationType>\n */\n","/**\n * Internal support for selecting messages to render, with placeholder\n * interpolation and locale-aware number formatting and pluralisation\n *\n * @internal\n */\nexport class I18n {\n translations\n locale\n\n /**\n * @internal\n * @param {{ [key: string]: string | TranslationPluralForms }} translations - Key-value pairs of the translation strings to use.\n * @param {object} [config] - Configuration options for the function.\n * @param {string | null} [config.locale] - An overriding locale for the PluralRules functionality.\n */\n constructor(translations = {}, config = {}) {\n // Make list of translations available throughout function\n this.translations = translations\n\n // The locale to use for PluralRules and NumberFormat\n this.locale = config.locale ?? (document.documentElement.lang || 'en')\n }\n\n /**\n * The most used function - takes the key for a given piece of UI text and\n * returns the appropriate string.\n *\n * @internal\n * @param {string} lookupKey - The lookup key of the string to use.\n * @param {{ [key: string]: unknown }} [options] - Any options passed with the translation string, e.g: for string interpolation.\n * @returns {string} The appropriate translation string.\n * @throws {Error} Lookup key required\n * @throws {Error} Options required for `${}` placeholders\n */\n t(lookupKey, options) {\n if (!lookupKey) {\n // Print a console error if no lookup key has been provided\n throw new Error('i18n: lookup key missing')\n }\n\n // Fetch the translation for that lookup key\n let translation = this.translations[lookupKey]\n\n // If the `count` option is set, determine which plural suffix is needed and\n // change the lookupKey to match. We check to see if it's numeric instead of\n // falsy, as this could legitimately be 0.\n if (typeof options?.count === 'number' && typeof translation === 'object') {\n const translationPluralForm =\n translation[this.getPluralSuffix(lookupKey, options.count)]\n\n // Update translation with plural suffix\n if (translationPluralForm) {\n translation = translationPluralForm\n }\n }\n\n if (typeof translation === 'string') {\n // Check for ${} placeholders in the translation string\n if (translation.match(/%{(.\\S+)}/)) {\n if (!options) {\n throw new Error(\n 'i18n: cannot replace placeholders in string if no option data provided'\n )\n }\n\n return this.replacePlaceholders(translation, options)\n }\n\n return translation\n }\n\n // If the key wasn't found in our translations object,\n // return the lookup key itself as the fallback\n return lookupKey\n }\n\n /**\n * Takes a translation string with placeholders, and replaces the placeholders\n * with the provided data\n *\n * @internal\n * @param {string} translationString - The translation string\n * @param {{ [key: string]: unknown }} options - Any options passed with the translation string, e.g: for string interpolation.\n * @returns {string} The translation string to output, with $\\{\\} placeholders replaced\n */\n replacePlaceholders(translationString, options) {\n const formatter = Intl.NumberFormat.supportedLocalesOf(this.locale).length\n ? new Intl.NumberFormat(this.locale)\n : undefined\n\n return translationString.replace(\n /%{(.\\S+)}/g,\n\n /**\n * Replace translation string placeholders\n *\n * @internal\n * @param {string} placeholderWithBraces - Placeholder with braces\n * @param {string} placeholderKey - Placeholder key\n * @returns {string} Placeholder value\n */\n function (placeholderWithBraces, placeholderKey) {\n if (Object.prototype.hasOwnProperty.call(options, placeholderKey)) {\n const placeholderValue = options[placeholderKey]\n\n // If a user has passed `false` as the value for the placeholder\n // treat it as though the value should not be displayed\n if (\n placeholderValue === false ||\n (typeof placeholderValue !== 'number' &&\n typeof placeholderValue !== 'string')\n ) {\n return ''\n }\n\n // If the placeholder's value is a number, localise the number formatting\n if (typeof placeholderValue === 'number') {\n return formatter\n ? formatter.format(placeholderValue)\n : `${placeholderValue}`\n }\n\n return placeholderValue\n }\n\n throw new Error(\n `i18n: no data found to replace ${placeholderWithBraces} placeholder in string`\n )\n }\n )\n }\n\n /**\n * Check to see if the browser supports Intl.PluralRules\n *\n * It requires all conditions to be met in order to be supported:\n * - The implementation of Intl supports PluralRules (NOT true in Safari 10–12)\n * - The browser/OS has plural rules for the current locale (browser dependent)\n *\n * {@link https://browsersl.ist/#q=supports+es6-module+and+not+supports+intl-pluralrules}\n *\n * @internal\n * @returns {boolean} Returns true if all conditions are met. Returns false otherwise.\n */\n hasIntlPluralRulesSupport() {\n return Boolean(\n 'PluralRules' in window.Intl &&\n Intl.PluralRules.supportedLocalesOf(this.locale).length\n )\n }\n\n /**\n * Get the appropriate suffix for the plural form.\n *\n * Uses Intl.PluralRules (or our own fallback implementation) to get the\n * 'preferred' form to use for the given count.\n *\n * Checks that a translation has been provided for that plural form – if it\n * hasn't, it'll fall back to the 'other' plural form (unless that doesn't exist\n * either, in which case an error will be thrown)\n *\n * @internal\n * @param {string} lookupKey - The lookup key of the string to use.\n * @param {number} count - Number used to determine which pluralisation to use.\n * @returns {PluralRule} The suffix associated with the correct pluralisation for this locale.\n * @throws {Error} Plural form `.other` required when preferred plural form is missing\n */\n getPluralSuffix(lookupKey, count) {\n // Validate that the number is actually a number.\n //\n // Number(count) will turn anything that can't be converted to a Number type\n // into 'NaN'. isFinite filters out NaN, as it isn't a finite number.\n count = Number(count)\n if (!isFinite(count)) {\n return 'other'\n }\n\n // Fetch the translation for that lookup key\n const translation = this.translations[lookupKey]\n\n // Check to verify that all the requirements for Intl.PluralRules are met.\n // If so, we can use that instead of our custom implementation. Otherwise,\n // use the hardcoded fallback.\n const preferredForm = this.hasIntlPluralRulesSupport()\n ? new Intl.PluralRules(this.locale).select(count)\n : this.selectPluralFormUsingFallbackRules(count)\n\n // Use the correct plural form if provided\n if (typeof translation === 'object') {\n if (preferredForm in translation) {\n return preferredForm\n // Fall back to `other` if the plural form is missing, but log a warning\n // to the console\n } else if ('other' in translation) {\n console.warn(\n `i18n: Missing plural form \".${preferredForm}\" for \"${this.locale}\" locale. Falling back to \".other\".`\n )\n\n return 'other'\n }\n }\n\n // If the required `other` plural form is missing, all we can do is error\n throw new Error(\n `i18n: Plural form \".other\" is required for \"${this.locale}\" locale`\n )\n }\n\n /**\n * Get the plural form using our fallback implementation\n *\n * This is split out into a separate function to make it easier to test the\n * fallback behaviour in an environment where Intl.PluralRules exists.\n *\n * @internal\n * @param {number} count - Number used to determine which pluralisation to use.\n * @returns {PluralRule} The pluralisation form for count in this locale.\n */\n selectPluralFormUsingFallbackRules(count) {\n // Currently our custom code can only handle positive integers, so let's\n // make sure our number is one of those.\n count = Math.abs(Math.floor(count))\n\n const ruleset = this.getPluralRulesForLocale()\n\n if (ruleset) {\n return I18n.pluralRules[ruleset](count)\n }\n\n return 'other'\n }\n\n /**\n * Work out which pluralisation rules to use for the current locale\n *\n * The locale may include a regional indicator (such as en-GB), but we don't\n * usually care about this part, as pluralisation rules are usually the same\n * regardless of region. There are exceptions, however, (e.g. Portuguese) so\n * this searches by both the full and shortened locale codes, just to be sure.\n *\n * @internal\n * @returns {string | undefined} The name of the pluralisation rule to use (a key for one\n * of the functions in this.pluralRules)\n */\n getPluralRulesForLocale() {\n const localeShort = this.locale.split('-')[0]\n\n // Look through the plural rules map to find which `pluralRule` is\n // appropriate for our current `locale`.\n for (const pluralRule in I18n.pluralRulesMap) {\n const languages = I18n.pluralRulesMap[pluralRule]\n if (languages.includes(this.locale) || languages.includes(localeShort)) {\n return pluralRule\n }\n }\n }\n\n /**\n * Map of plural rules to languages where those rules apply.\n *\n * Note: These groups are named for the most dominant or recognisable language\n * that uses each system. The groupings do not imply that the languages are\n * related to one another. Many languages have evolved the same systems\n * independently of one another.\n *\n * Code to support more languages can be found in the i18n spike:\n * {@link https://github.com/alphagov/govuk-frontend/blob/spike-i18n-support/src/govuk/i18n.mjs}\n *\n * Languages currently supported:\n *\n * Arabic: Arabic (ar)\n * Chinese: Burmese (my), Chinese (zh), Indonesian (id), Japanese (ja),\n * Javanese (jv), Korean (ko), Malay (ms), Thai (th), Vietnamese (vi)\n * French: Armenian (hy), Bangla (bn), French (fr), Gujarati (gu), Hindi (hi),\n * Persian Farsi (fa), Punjabi (pa), Zulu (zu)\n * German: Afrikaans (af), Albanian (sq), Azerbaijani (az), Basque (eu),\n * Bulgarian (bg), Catalan (ca), Danish (da), Dutch (nl), English (en),\n * Estonian (et), Finnish (fi), Georgian (ka), German (de), Greek (el),\n * Hungarian (hu), Luxembourgish (lb), Norwegian (no), Somali (so),\n * Swahili (sw), Swedish (sv), Tamil (ta), Telugu (te), Turkish (tr),\n * Urdu (ur)\n * Irish: Irish Gaelic (ga)\n * Russian: Russian (ru), Ukrainian (uk)\n * Scottish: Scottish Gaelic (gd)\n * Spanish: European Portuguese (pt-PT), Italian (it), Spanish (es)\n * Welsh: Welsh (cy)\n *\n * @internal\n * @type {{ [key: string]: string[] }}\n */\n static pluralRulesMap = {\n arabic: ['ar'],\n chinese: ['my', 'zh', 'id', 'ja', 'jv', 'ko', 'ms', 'th', 'vi'],\n french: ['hy', 'bn', 'fr', 'gu', 'hi', 'fa', 'pa', 'zu'],\n german: [\n 'af',\n 'sq',\n 'az',\n 'eu',\n 'bg',\n 'ca',\n 'da',\n 'nl',\n 'en',\n 'et',\n 'fi',\n 'ka',\n 'de',\n 'el',\n 'hu',\n 'lb',\n 'no',\n 'so',\n 'sw',\n 'sv',\n 'ta',\n 'te',\n 'tr',\n 'ur'\n ],\n irish: ['ga'],\n russian: ['ru', 'uk'],\n scottish: ['gd'],\n spanish: ['pt-PT', 'it', 'es'],\n welsh: ['cy']\n }\n\n /**\n * Different pluralisation rule sets\n *\n * Returns the appropriate suffix for the plural form associated with `n`.\n * Possible suffixes: 'zero', 'one', 'two', 'few', 'many', 'other' (the actual\n * meaning of each differs per locale). 'other' should always exist, even in\n * languages without plurals, such as Chinese.\n * {@link https://cldr.unicode.org/index/cldr-spec/plural-rules}\n *\n * The count must be a positive integer. Negative numbers and decimals aren't accounted for\n *\n * @internal\n * @type {{ [key: string]: (count: number) => PluralRule }}\n */\n static pluralRules = {\n arabic(n) {\n if (n === 0) {\n return 'zero'\n }\n if (n === 1) {\n return 'one'\n }\n if (n === 2) {\n return 'two'\n }\n if (n % 100 >= 3 && n % 100 <= 10) {\n return 'few'\n }\n if (n % 100 >= 11 && n % 100 <= 99) {\n return 'many'\n }\n return 'other'\n },\n chinese() {\n return 'other'\n },\n french(n) {\n return n === 0 || n === 1 ? 'one' : 'other'\n },\n german(n) {\n return n === 1 ? 'one' : 'other'\n },\n irish(n) {\n if (n === 1) {\n return 'one'\n }\n if (n === 2) {\n return 'two'\n }\n if (n >= 3 && n <= 6) {\n return 'few'\n }\n if (n >= 7 && n <= 10) {\n return 'many'\n }\n return 'other'\n },\n russian(n) {\n const lastTwo = n % 100\n const last = lastTwo % 10\n if (last === 1 && lastTwo !== 11) {\n return 'one'\n }\n if (last >= 2 && last <= 4 && !(lastTwo >= 12 && lastTwo <= 14)) {\n return 'few'\n }\n if (\n last === 0 ||\n (last >= 5 && last <= 9) ||\n (lastTwo >= 11 && lastTwo <= 14)\n ) {\n return 'many'\n }\n // Note: The 'other' suffix is only used by decimal numbers in Russian.\n // We don't anticipate it being used, but it's here for consistency.\n return 'other'\n },\n scottish(n) {\n if (n === 1 || n === 11) {\n return 'one'\n }\n if (n === 2 || n === 12) {\n return 'two'\n }\n if ((n >= 3 && n <= 10) || (n >= 13 && n <= 19)) {\n return 'few'\n }\n return 'other'\n },\n spanish(n) {\n if (n === 1) {\n return 'one'\n }\n if (n % 1000000 === 0 && n !== 0) {\n return 'many'\n }\n return 'other'\n },\n welsh(n) {\n if (n === 0) {\n return 'zero'\n }\n if (n === 1) {\n return 'one'\n }\n if (n === 2) {\n return 'two'\n }\n if (n === 3) {\n return 'few'\n }\n if (n === 6) {\n return 'many'\n }\n return 'other'\n }\n }\n}\n\n/**\n * Plural rule category mnemonic tags\n *\n * @internal\n * @typedef {'zero' | 'one' | 'two' | 'few' | 'many' | 'other'} PluralRule\n */\n\n/**\n * Translated message by plural rule they correspond to.\n *\n * Allows to group pluralised messages under a single key when passing\n * translations to a component's constructor\n *\n * @internal\n * @typedef {object} TranslationPluralForms\n * @property {string} [other] - General plural form\n * @property {string} [zero] - Plural form used with 0\n * @property {string} [one] - Plural form used with 1\n * @property {string} [two] - Plural form used with 2\n * @property {string} [few] - Plural form used for a few\n * @property {string} [many] - Plural form used for many\n */\n","import { closestAttributeValue } from '../../common/closest-attribute-value.mjs'\nimport { ConfigurableComponent } from '../../common/configuration.mjs'\nimport { formatErrorMessage } from '../../common/index.mjs'\nimport { ElementError } from '../../errors/index.mjs'\nimport { I18n } from '../../i18n.mjs'\n\n/**\n * File upload component\n *\n * @preserve\n * @augments ConfigurableComponent<FileUploadConfig>\n */\nexport class FileUpload extends ConfigurableComponent {\n /**\n * @private\n * @type {HTMLFileInputElement}\n */\n $input\n\n /**\n * @private\n */\n $button\n\n /**\n * @private\n */\n $status\n\n /** @private */\n i18n\n\n /** @private */\n id\n\n /** @private */\n $announcements\n\n /**\n * @private\n * @type {boolean | undefined}\n */\n enteredAnotherElement\n\n /**\n * @param {Element | null} $root - File input element\n * @param {FileUploadConfig} [config] - File Upload config\n */\n constructor($root, config = {}) {\n super($root, config)\n\n const $input = this.$root.querySelector('input')\n\n if ($input === null) {\n throw new ElementError({\n component: FileUpload,\n identifier: 'File inputs (`<input type=\"file\">`)'\n })\n }\n\n if ($input.type !== 'file') {\n throw new ElementError(\n formatErrorMessage(\n FileUpload,\n 'File input (`<input type=\"file\">`) attribute (`type`) is not `file`'\n )\n )\n }\n\n this.$input = /** @type {HTMLFileInputElement} */ ($input)\n this.$input.setAttribute('hidden', 'true')\n\n if (!this.$input.id) {\n throw new ElementError({\n component: FileUpload,\n identifier: 'File input (`<input type=\"file\">`) attribute (`id`)'\n })\n }\n\n this.id = this.$input.id\n\n this.i18n = new I18n(this.config.i18n, {\n // Read the fallback if necessary rather than have it set in the defaults\n locale: closestAttributeValue(this.$root, 'lang')\n })\n\n const $label = this.findLabel()\n // Add an ID to the label if it doesn't have one already\n // so it can be referenced by `aria-labelledby`\n if (!$label.id) {\n $label.id = `${this.id}-label`\n }\n\n // we need to copy the 'id' of the root element\n // to the new button replacement element\n // so that focus will work in the error summary\n this.$input.id = `${this.id}-input`\n\n // Create the file selection button\n const $button = document.createElement('button')\n $button.classList.add('govuk-file-upload-button')\n $button.type = 'button'\n $button.id = this.id\n $button.classList.add('govuk-file-upload-button--empty')\n\n // Copy `aria-describedby` if present so hints and errors\n // are associated to the `<button>`\n const ariaDescribedBy = this.$input.getAttribute('aria-describedby')\n if (ariaDescribedBy) {\n $button.setAttribute('aria-describedby', ariaDescribedBy)\n }\n\n // Create status element that shows what/how many files are selected\n const $status = document.createElement('span')\n $status.className = 'govuk-body govuk-file-upload-button__status'\n $status.setAttribute('aria-live', 'polite')\n $status.innerText = this.i18n.t('noFileChosen')\n\n $button.appendChild($status)\n\n const commaSpan = document.createElement('span')\n commaSpan.className = 'govuk-visually-hidden'\n commaSpan.innerText = ', '\n commaSpan.id = `${this.id}-comma`\n\n $button.appendChild(commaSpan)\n\n const containerSpan = document.createElement('span')\n containerSpan.className =\n 'govuk-file-upload-button__pseudo-button-container'\n\n const buttonSpan = document.createElement('span')\n buttonSpan.className =\n 'govuk-button govuk-button--secondary govuk-file-upload-button__pseudo-button'\n buttonSpan.innerText = this.i18n.t('chooseFilesButton')\n\n containerSpan.appendChild(buttonSpan)\n\n // Add a space so the button and instruction read correctly\n // when CSS is disabled\n containerSpan.insertAdjacentText('beforeend', ' ')\n\n const instructionSpan = document.createElement('span')\n instructionSpan.className =\n 'govuk-body govuk-file-upload-button__instruction'\n instructionSpan.innerText = this.i18n.t('dropInstruction')\n\n containerSpan.appendChild(instructionSpan)\n\n $button.appendChild(containerSpan)\n $button.setAttribute(\n 'aria-labelledby',\n `${$label.id} ${commaSpan.id} ${$button.id}`\n )\n $button.addEventListener('click', this.onClick.bind(this))\n $button.addEventListener('dragover', (event) => {\n // prevent default to allow drop\n event.preventDefault()\n })\n\n // Assemble these all together\n this.$root.insertAdjacentElement('afterbegin', $button)\n\n this.$input.setAttribute('tabindex', '-1')\n this.$input.setAttribute('aria-hidden', 'true')\n\n // Make all these new variables available to the module\n this.$button = $button\n this.$status = $status\n\n // Bind change event to the underlying input\n this.$input.addEventListener('change', this.onChange.bind(this))\n\n // Synchronise the `disabled` state between the button and underlying input\n this.updateDisabledState()\n this.observeDisabledState()\n\n // Handle drop zone visibility\n // A live region to announce when users enter or leave the drop zone\n this.$announcements = document.createElement('span')\n this.$announcements.classList.add('govuk-file-upload-announcements')\n this.$announcements.classList.add('govuk-visually-hidden')\n this.$announcements.setAttribute('aria-live', 'assertive')\n this.$root.insertAdjacentElement('afterend', this.$announcements)\n\n // if there is no CSS and input is hidden\n // button will need to handle drop event\n this.$button.addEventListener('drop', this.onDrop.bind(this))\n\n // While user is dragging, it gets a little more complex because of Safari.\n // Safari doesn't fill `relatedTarget` on `dragleave` (nor `dragenter`).\n // This means we can't use `relatedTarget` to:\n // - check if the user is still within the wrapper\n // (`relatedTarget` being a descendant of the wrapper)\n // - check if the user is still over the viewport\n // (`relatedTarget` being null if outside)\n\n // Thanks to `dragenter` bubbling, we can listen on the `document` with a\n // single function and update the visibility based on whether we entered a\n // node inside or outside the wrapper.\n document.addEventListener(\n 'dragenter',\n this.updateDropzoneVisibility.bind(this)\n )\n\n // To detect if we're outside the document, we can track if there was a\n // `dragenter` event preceding a `dragleave`. If there wasn't, this means\n // we're outside the document.\n //\n // The order of events is guaranteed by the HTML specs:\n // https://html.spec.whatwg.org/multipage/dnd.html#drag-and-drop-processing-model\n document.addEventListener('dragenter', () => {\n this.enteredAnotherElement = true\n })\n\n document.addEventListener('dragleave', () => {\n if (!this.enteredAnotherElement && !this.$button.disabled) {\n this.hideDraggingState()\n this.$announcements.innerText = this.i18n.t('leftDropZone')\n }\n\n this.enteredAnotherElement = false\n })\n }\n\n /**\n * Updates the visibility of the dropzone as users enters the various elements on the page\n *\n * @private\n * @param {DragEvent} event - The `dragenter` event\n */\n updateDropzoneVisibility(event) {\n if (this.$button.disabled) return\n\n // DOM interfaces only type `event.target` as `EventTarget`\n // so we first need to make sure it's a `Node`\n if (event.target instanceof Node) {\n if (this.$root.contains(event.target)) {\n if (event.dataTransfer && isContainingFiles(event.dataTransfer)) {\n // Only update the class and make the announcement if not already visible\n // to avoid repeated announcements on NVDA (2024.4) + Firefox (133)\n if (\n !this.$button.classList.contains(\n 'govuk-file-upload-button--dragging'\n )\n ) {\n this.showDraggingState()\n this.$announcements.innerText = this.i18n.t('enteredDropZone')\n }\n }\n } else {\n // Only hide the dropzone if it is visible to prevent announcing user\n // left the drop zone when they enter the page but haven't reached yet\n // the file upload component\n if (\n this.$button.classList.contains('govuk-file-upload-button--dragging')\n ) {\n this.hideDraggingState()\n this.$announcements.innerText = this.i18n.t('leftDropZone')\n }\n }\n }\n }\n\n /**\n * Show the drop zone visually\n *\n * @private\n */\n showDraggingState() {\n this.$button.classList.add('govuk-file-upload-button--dragging')\n }\n\n /**\n * Hides the drop zone visually\n *\n * @private\n */\n hideDraggingState() {\n this.$button.classList.remove('govuk-file-upload-button--dragging')\n }\n\n /**\n * Handles user dropping on the component\n *\n * @private\n * @param {DragEvent} event - The `dragenter` event\n */\n onDrop(event) {\n event.preventDefault()\n\n if (event.dataTransfer && isContainingFiles(event.dataTransfer)) {\n this.$input.files = event.dataTransfer.files\n\n // Dispatch a `change` event so external code that would rely on the `<input>`\n // dispatching an event when files are dropped still work.\n // Use a `CustomEvent` so our events are distinguishable from browser's native events\n this.$input.dispatchEvent(new CustomEvent('change'))\n\n this.hideDraggingState()\n }\n }\n\n /**\n * Check if the value of the underlying input has changed\n *\n * @private\n */\n onChange() {\n const fileCount = this.$input.files.length\n\n if (fileCount === 0) {\n // If there are no files, show the default selection text\n this.$status.innerText = this.i18n.t('noFileChosen')\n this.$button.classList.add('govuk-file-upload-button--empty')\n } else {\n if (\n // If there is 1 file, just show the file name\n fileCount === 1\n ) {\n this.$status.innerText = this.$input.files[0].name\n } else {\n // Otherwise, tell the user how many files are selected\n this.$status.innerText = this.i18n.t('multipleFilesChosen', {\n count: fileCount\n })\n }\n\n this.$button.classList.remove('govuk-file-upload-button--empty')\n }\n }\n\n /**\n * Looks up the `<label>` element associated to the field\n *\n * @private\n * @returns {HTMLElement} The `<label>` element associated to the field\n * @throws {ElementError} If the `<label>` cannot be found\n */\n findLabel() {\n // Use `label` in the selector so TypeScript knows the type fo `HTMLElement`\n const $label = document.querySelector(`label[for=\"${this.$input.id}\"]`)\n\n if (!$label) {\n throw new ElementError({\n component: FileUpload,\n identifier: `Field label (\\`<label for=${this.$input.id}>\\`)`\n })\n }\n\n return $label\n }\n\n /**\n * When the button is clicked, emulate clicking the actual, hidden file input\n *\n * @private\n */\n onClick() {\n this.$input.click()\n }\n\n /**\n * Create a mutation observer to check if the input's attributes altered.\n *\n * @private\n */\n observeDisabledState() {\n const observer = new MutationObserver((mutationList) => {\n for (const mutation of mutationList) {\n if (\n mutation.type === 'attributes' &&\n mutation.attributeName === 'disabled'\n ) {\n this.updateDisabledState()\n }\n }\n })\n\n observer.observe(this.$input, {\n attributes: true\n })\n }\n\n /**\n * Synchronise the `disabled` state between the input and replacement button.\n *\n * @private\n */\n updateDisabledState() {\n this.$button.disabled = this.$input.disabled\n\n this.$root.classList.toggle(\n 'govuk-drop-zone--disabled',\n this.$button.disabled\n )\n }\n\n /**\n * Name for the component used when initialising using data-module attributes.\n */\n static moduleName = 'govuk-file-upload'\n\n /**\n * File upload default config\n *\n * @see {@link FileUploadConfig}\n * @constant\n * @type {FileUploadConfig}\n */\n static defaults = Object.freeze({\n i18n: {\n chooseFilesButton: 'Choose file',\n dropInstruction: 'or drop file',\n noFileChosen: 'No file chosen',\n multipleFilesChosen: {\n // the 'one' string isn't used as the component displays the filename\n // instead, however it's here for coverage's sake\n one: '%{count} file chosen',\n other: '%{count} files chosen'\n },\n enteredDropZone: 'Entered drop zone',\n leftDropZone: 'Left drop zone'\n }\n })\n\n /**\n * File upload config schema\n *\n * @constant\n * @satisfies {Schema<FileUploadConfig>}\n */\n static schema = Object.freeze({\n properties: {\n i18n: { type: 'object' }\n }\n })\n}\n\n/**\n * Checks if the given `DataTransfer` contains files\n *\n * @internal\n * @param {DataTransfer} dataTransfer - The `DataTransfer` to check\n * @returns {boolean} - `true` if it contains files or we can't infer it, `false` otherwise\n */\nfunction isContainingFiles(dataTransfer) {\n // Safari sometimes does not provide info about types :'(\n // In which case best not to assume anything and try to set the files\n const hasNoTypesInfo = dataTransfer.types.length === 0\n\n // When dragging images, there's a mix of mime types + Files\n // which we can't assign to the native input\n const isDraggingFiles = dataTransfer.types.some((type) => type === 'Files')\n\n return hasNoTypesInfo || isDraggingFiles\n}\n\n/**\n * @typedef {HTMLInputElement & {files: FileList}} HTMLFileInputElement\n */\n\n/**\n * File upload config\n *\n * @see {@link FileUpload.defaults}\n * @typedef {object} FileUploadConfig\n * @property {FileUploadTranslations} [i18n=FileUpload.defaults.i18n] - File upload translations\n */\n\n/**\n * File upload translations\n *\n * @see {@link FileUpload.defaults.i18n}\n * @typedef {object} FileUploadTranslations\n *\n * Messages used by the component\n * @property {string} [chooseFile] - The text of the button that opens the file picker\n * @property {string} [dropInstruction] - The text informing users they can drop files\n * @property {TranslationPluralForms} [multipleFilesChosen] - The text displayed when multiple files\n * have been chosen by the user\n * @property {string} [noFileChosen] - The text to displayed when no file has been chosen by the user\n * @property {string} [enteredDropZone] - The text announced by assistive technology\n * when user drags files and enters the drop zone\n * @property {string} [leftDropZone] - The text announced by assistive technology\n * when user drags files and leaves the drop zone without dropping\n */\n\n/**\n * @import { Schema } from '../../common/configuration.mjs'\n * @import { TranslationPluralForms } from '../../i18n.mjs'\n 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