93 lines
2.6 KiB
JavaScript
93 lines
2.6 KiB
JavaScript
const path = require('path');
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const url = require('url');
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const formattedImport = async file => {
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if (path.isAbsolute(file)) {
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try {
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return await import(url.pathToFileURL(file));
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} catch (err) {
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// This is a hack created because ESM in Node.js (at least in Node v15.5.1) does not emit
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// the location of the syntax error in the error thrown.
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// This is problematic because the user can't see what file has the problem,
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// so we add the file location to the error.
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// This `if` should be removed once Node.js fixes the problem.
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if (
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err instanceof SyntaxError &&
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err.message &&
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err.stack &&
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!err.stack.includes(file)
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) {
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const newErrorWithFilename = new SyntaxError(err.message);
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newErrorWithFilename.stack = err.stack.replace(
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/^SyntaxError/,
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`SyntaxError[ @${file} ]`
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);
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throw newErrorWithFilename;
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}
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throw err;
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}
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}
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return import(file);
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};
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const hasStableEsmImplementation = (() => {
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const [major, minor] = process.version.split('.');
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// ESM is stable from v12.22.0 onward
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// https://nodejs.org/api/esm.html#esm_modules_ecmascript_modules
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return parseInt(major.slice(1), 10) > 12 || parseInt(minor, 10) >= 22;
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})();
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exports.requireOrImport = hasStableEsmImplementation
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? async file => {
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if (path.extname(file) === '.mjs') {
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return formattedImport(file);
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}
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try {
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return dealWithExports(await formattedImport(file));
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} catch (err) {
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if (
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err.code === 'ERR_MODULE_NOT_FOUND' ||
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err.code === 'ERR_UNKNOWN_FILE_EXTENSION'
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) {
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return require(file);
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} else {
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throw err;
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}
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}
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}
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: implementationOfRequireOrImportForUnstableEsm;
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function dealWithExports(module) {
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if (module.default) {
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return module.default;
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} else {
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return {...module, default: undefined};
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}
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}
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exports.loadFilesAsync = async (files, preLoadFunc, postLoadFunc) => {
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for (const file of files) {
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preLoadFunc(file);
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const result = await exports.requireOrImport(path.resolve(file));
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postLoadFunc(file, result);
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}
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};
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/* istanbul ignore next */
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async function implementationOfRequireOrImportForUnstableEsm(file) {
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if (path.extname(file) === '.mjs') {
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return formattedImport(file);
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}
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// This is currently the only known way of figuring out whether a file is CJS or ESM in
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// Node.js that doesn't necessitate calling `import` first.
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try {
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return require(file);
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} catch (err) {
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if (err.code === 'ERR_REQUIRE_ESM') {
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return formattedImport(file);
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} else {
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throw err;
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}
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}
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}
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