{"version":3,"file":"accordion.bundle.js","sources":["../../../../src/govuk/common/normalise-string.mjs","../../../../src/govuk/common/index.mjs","../../../../src/govuk/common/normalise-dataset.mjs","../../../../src/govuk/errors/index.mjs","../../../../src/govuk/govuk-frontend-component.mjs","../../../../src/govuk/i18n.mjs","../../../../src/govuk/components/accordion/accordion.mjs"],"sourcesContent":["/**\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 * @typedef {import('./index.mjs').SchemaProperty} SchemaProperty\n */\n","import { normaliseString } from './normalise-string.mjs'\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 * 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 // @ts-expect-error Index signature for type 'string' is missing\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 * 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 * @param {{ schema: Schema }} Component - Component class\n * @param {DOMStringMap} dataset - The object to extract key-value pairs from\n * @param {string} namespace - The namespace to filter keys with\n * @returns {ObjectNested | undefined} Nested object with dot-separated key namespace removed\n */\nexport function extractConfigByNamespace(Component, dataset, namespace) {\n const property = Component.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 = {\n [namespace]: /** @type {ObjectNested} */ ({})\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 (typeof current === 'object') {\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 * 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-frontend-breakpoint-${name}`\n\n // Get value from `` 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 $element.focus()\n}\n\n/**\n * Checks if GOV.UK Frontend is supported on this page\n *\n * Some browsers will load and run our JavaScript but GOV.UK Frontend\n * won't be supported.\n *\n * @internal\n * @param {HTMLElement | null} [$scope] - 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 * 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 * @param {Schema} schema - Config schema\n * @param {{ [key: string]: unknown }} 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 * 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 * @param {unknown} option - Option to check\n * @returns {boolean} Whether the option is an object\n */\nfunction isObject(option) {\n return !!option && typeof option === 'object' && !isArray(option)\n}\n\n/**\n * Schema for component config\n *\n * @typedef {object} Schema\n * @property {{ [field: string]: SchemaProperty | undefined }} properties - Schema properties\n * @property {SchemaCondition[]} [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 * @typedef {object} SchemaCondition\n * @property {string[]} required - List of required config fields\n * @property {string} errorMessage - Error message when required config fields not provided\n */\n\n/**\n * @internal\n * @typedef {keyof ObjectNested} NestedKey\n * @typedef {{ [key: string]: string | boolean | number | ObjectNested | undefined }} ObjectNested\n */\n","import { extractConfigByNamespace } from './index.mjs'\nimport { normaliseString } from './normalise-string.mjs'\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 * @param {{ schema: Schema }} Component - Component class\n * @param {DOMStringMap} dataset - HTML element dataset\n * @returns {ObjectNested} Normalised dataset\n */\nexport function normaliseDataset(Component, dataset) {\n const out = /** @type {ReturnType