59 lines
1.8 KiB
JavaScript
59 lines
1.8 KiB
JavaScript
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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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exports.requireOrImport = 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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// This is currently the only known way of figuring out whether a file is CJS or ESM.
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// If Node.js or the community establish a better procedure for that, we can fix this code.
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// Another option here would be to always use `import()`, as this also supports CJS, but I would be
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// wary of using it for _all_ existing test files, till ESM is fully stable.
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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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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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