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modules: prevent race condition while combining import and require #27674

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modules: prevent race condition while combining import and require #27674

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10 changes: 10 additions & 0 deletions lib/internal/modules/esm/translators.js
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Original file line number Diff line number Diff line change
Expand Up @@ -123,6 +123,16 @@ translators.set('json', async function jsonStrategy(url) {
});
}
const content = await readFileAsync(pathname, 'utf-8');
// A require call could have been called on the same file during loading and
// that resolves synchronously. To make sure we always return the identical
// export, we have to check again if the module already exists or not.
module = CJSModule._cache[modulePath];
if (module && module.loaded) {
const exports = module.exports;
return createDynamicModule(['default'], url, (reflect) => {
reflect.exports.default.set(exports);
});
}
try {
const exports = JsonParse(stripBOM(content));
module = {
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