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160 lines
3.4 KiB
JavaScript
160 lines
3.4 KiB
JavaScript
// Manually “tree shaken” from:
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// <https://github.com/nodejs/node/blob/7c3dce0/lib/internal/modules/esm/get_format.js>
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// Last checked on: Apr 29, 2024.
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import {fileURLToPath} from 'node:url'
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import {getPackageType} from './package-json-reader.js'
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import {codes} from './errors.js'
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const {ERR_UNKNOWN_FILE_EXTENSION} = codes
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const hasOwnProperty = {}.hasOwnProperty
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/** @type {Record<string, string>} */
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const extensionFormatMap = {
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// @ts-expect-error: hush.
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__proto__: null,
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'.cjs': 'commonjs',
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'.js': 'module',
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'.json': 'json',
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'.mjs': 'module'
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}
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/**
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* @param {string | null} mime
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* @returns {string | null}
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*/
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function mimeToFormat(mime) {
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if (
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mime &&
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/\s*(text|application)\/javascript\s*(;\s*charset=utf-?8\s*)?/i.test(mime)
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)
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return 'module'
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if (mime === 'application/json') return 'json'
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return null
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}
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/**
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* @callback ProtocolHandler
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* @param {URL} parsed
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* @param {{parentURL: string, source?: Buffer}} context
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* @param {boolean} ignoreErrors
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* @returns {string | null | void}
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*/
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/**
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* @type {Record<string, ProtocolHandler>}
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*/
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const protocolHandlers = {
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// @ts-expect-error: hush.
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__proto__: null,
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'data:': getDataProtocolModuleFormat,
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'file:': getFileProtocolModuleFormat,
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'http:': getHttpProtocolModuleFormat,
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'https:': getHttpProtocolModuleFormat,
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'node:'() {
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return 'builtin'
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}
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}
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/**
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* @param {URL} parsed
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*/
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function getDataProtocolModuleFormat(parsed) {
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const {1: mime} = /^([^/]+\/[^;,]+)[^,]*?(;base64)?,/.exec(
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parsed.pathname
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) || [null, null, null]
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return mimeToFormat(mime)
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}
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/**
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* Returns the file extension from a URL.
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*
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* Should give similar result to
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* `require('node:path').extname(require('node:url').fileURLToPath(url))`
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* when used with a `file:` URL.
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*
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* @param {URL} url
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* @returns {string}
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*/
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function extname(url) {
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const pathname = url.pathname
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let index = pathname.length
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while (index--) {
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const code = pathname.codePointAt(index)
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if (code === 47 /* `/` */) {
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return ''
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}
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if (code === 46 /* `.` */) {
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return pathname.codePointAt(index - 1) === 47 /* `/` */
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? ''
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: pathname.slice(index)
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}
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}
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return ''
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}
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/**
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* @type {ProtocolHandler}
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*/
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function getFileProtocolModuleFormat(url, _context, ignoreErrors) {
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const value = extname(url)
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if (value === '.js') {
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const packageType = getPackageType(url)
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if (packageType !== 'none') {
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return packageType
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}
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return 'commonjs'
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}
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if (value === '') {
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const packageType = getPackageType(url)
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// Legacy behavior
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if (packageType === 'none' || packageType === 'commonjs') {
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return 'commonjs'
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}
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// Note: we don’t implement WASM, so we don’t need
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// `getFormatOfExtensionlessFile` from `formats`.
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return 'module'
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}
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const format = extensionFormatMap[value]
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if (format) return format
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// Explicit undefined return indicates load hook should rerun format check
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if (ignoreErrors) {
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return undefined
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}
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const filepath = fileURLToPath(url)
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throw new ERR_UNKNOWN_FILE_EXTENSION(value, filepath)
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}
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function getHttpProtocolModuleFormat() {
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// To do: HTTPS imports.
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}
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/**
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* @param {URL} url
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* @param {{parentURL: string}} context
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* @returns {string | null}
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*/
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export function defaultGetFormatWithoutErrors(url, context) {
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const protocol = url.protocol
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if (!hasOwnProperty.call(protocolHandlers, protocol)) {
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return null
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}
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return protocolHandlers[protocol](url, context, true) || null
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}
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