40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
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'use strict';
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var pathToFileURL = require('url').pathToFileURL;
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var importESM;
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try {
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// Node.js <10 errors out with a SyntaxError when loading a script that uses import().
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// So a function is dynamically created to catch the SyntaxError at runtime instead of parsetime.
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// That way we can keep supporting all Node.js versions all the way back to 0.10.
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importESM = new Function('id', 'return import(id);');
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} catch (e) {
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/* istanbul ignore next */
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importESM = null;
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}
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function requireOrImport(path, callback) {
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var err = null;
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var cjs;
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try {
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cjs = require(path);
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} catch (e) {
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/* istanbul ignore else */
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if (pathToFileURL && importESM) {
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// Because e.code is undefined on nyc process.
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/* istanbul ignore else */
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if (e.code === 'ERR_REQUIRE_ESM' || process.env.NYC_CONFIG) {
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// This is needed on Windows, because import() fails if providing a Windows file path.
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var url = pathToFileURL(path);
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importESM(url).then(function(esm) { callback(null, esm); }, callback);
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return;
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}
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}
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/* istanbul ignore next */
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err = e;
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}
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process.nextTick(function() { callback(err, cjs); });
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}
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module.exports = requireOrImport;
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