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const {
ObjectAssign,
ObjectCreate,
ObjectPrototypeHasOwnProperty,
RegExpPrototypeExec,
} = primordials;
const { extname } = require('path');
const { getOptionValue } = require('internal/options');
const experimentalJsonModules = getOptionValue('--experimental-json-modules');
const experimentalSpecifierResolution =
getOptionValue('--experimental-specifier-resolution');
const experimentalWasmModules = getOptionValue('--experimental-wasm-modules');
const { getPackageType } = require('internal/modules/esm/resolve');
const { URL, fileURLToPath } = require('internal/url');
const { ERR_UNKNOWN_FILE_EXTENSION } = require('internal/errors').codes;
const extensionFormatMap = {
'__proto__': null,
'.cjs': 'commonjs',
'.js': 'module',
'.mjs': 'module'
};
const legacyExtensionFormatMap = {
'__proto__': null,
'.cjs': 'commonjs',
'.js': 'commonjs',
'.json': 'commonjs',
'.mjs': 'module',
'.node': 'commonjs'
};
let experimentalSpecifierResolutionWarned = false;
if (experimentalWasmModules)
extensionFormatMap['.wasm'] = legacyExtensionFormatMap['.wasm'] = 'wasm';
if (experimentalJsonModules)
extensionFormatMap['.json'] = legacyExtensionFormatMap['.json'] = 'json';
const protocolHandlers = ObjectAssign(ObjectCreate(null), {
'data:'(parsed) {
const { 1: mime } = RegExpPrototypeExec(
/^([^/]+\/[^;,]+)(?:[^,]*?)(;base64)?,/,
parsed.pathname,
) || [, null]; // eslint-disable-line no-sparse-arrays
const format = ({
'__proto__': null,
'text/javascript': 'module',
'application/json': experimentalJsonModules ? 'json' : null,
'application/wasm': experimentalWasmModules ? 'wasm' : null
})[mime] || null;
return format;
},
'file:': getFileProtocolModuleFormat,
'node:'() { return 'builtin'; },
});
function getLegacyExtensionFormat(ext) {
if (
experimentalSpecifierResolution === 'node' &&
!experimentalSpecifierResolutionWarned
) {
process.emitWarning(
'The Node.js specifier resolution in ESM is experimental.',
'ExperimentalWarning');
experimentalSpecifierResolutionWarned = true;
}
return legacyExtensionFormatMap[ext];
}
function getFileProtocolModuleFormat(url, ignoreErrors) {
const ext = extname(url.pathname);
if (ext === '.js') {
return getPackageType(url) === 'module' ? 'module' : 'commonjs';
}
const format = extensionFormatMap[ext];
if (format) return format;
if (experimentalSpecifierResolution !== 'node') {
// Explicit undefined return indicates load hook should rerun format check
if (ignoreErrors)
return undefined;
throw new ERR_UNKNOWN_FILE_EXTENSION(ext, fileURLToPath(url));
}
return getLegacyExtensionFormat(ext) ?? null;
}
function defaultGetFormatWithoutErrors(url, context) {
const parsed = new URL(url);
if (!ObjectPrototypeHasOwnProperty(protocolHandlers, parsed.protocol))
return null;
return protocolHandlers[parsed.protocol](parsed, true);
}
function defaultGetFormat(url, context) {
const parsed = new URL(url);
return ObjectPrototypeHasOwnProperty(protocolHandlers, parsed.protocol) ?
protocolHandlers[parsed.protocol](parsed, false) :
null;
}
module.exports = {
defaultGetFormat,
defaultGetFormatWithoutErrors,
extensionFormatMap,
legacyExtensionFormatMap,
};
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