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Tooling in the ecosystem have been using the __esModule property to
recognize transpiled ESM in consuming code. For example, a 'log'
package written in ESM:
export function log(val) { console.log(val); }
Can be transpiled as:
exports.__esModule = true;
exports.default = function log(val) { console.log(val); }
The consuming code may be written like this in ESM:
import log from 'log'
Which gets transpiled to:
const _mod = require('log');
const log = _mod.__esModule ? _mod.default : _mod;
So to allow transpiled consuming code to recognize require()'d real ESM
as ESM and pick up the default exports, we add a __esModule property by
building a source text module facade for any module that has a default
export and add .__esModule = true to the exports. We don't do this to
modules that don't have default exports to avoid the unnecessary
overhead. This maintains the enumerability of the re-exported names
and the live binding of the exports.
The source of the facade is defined as a constant per-isolate property
required_module_facade_source_string, which looks like this
export * from 'original';
export { default } from 'original';
export const __esModule = true;
And the 'original' module request is always resolved by
createRequiredModuleFacade() to wrap which is a ModuleWrap wrapping
over the original module.
PR-URL: https://github.com/nodejs/node/pull/52166
Refs: https://github.com/nodejs/node/issues/52134
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
31 lines
897 B
JavaScript
31 lines
897 B
JavaScript
'use strict';
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require('../common');
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const { spawnSyncAndAssert } = require('../common/child_process');
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const fixtures = require('../common/fixtures');
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// This is a minimum integration test for CJS transpiled from ESM that tries to load real ESM.
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spawnSyncAndAssert(process.execPath, [
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'--experimental-require-module',
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fixtures.path('es-modules', 'transpiled-cjs-require-module', 'dist', 'import-both.cjs'),
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], {
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trim: true,
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stdout: 'import both',
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});
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spawnSyncAndAssert(process.execPath, [
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'--experimental-require-module',
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fixtures.path('es-modules', 'transpiled-cjs-require-module', 'dist', 'import-named.cjs'),
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], {
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trim: true,
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stdout: 'import named',
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});
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spawnSyncAndAssert(process.execPath, [
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'--experimental-require-module',
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fixtures.path('es-modules', 'transpiled-cjs-require-module', 'dist', 'import-default.cjs'),
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], {
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trim: true,
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stdout: 'import default',
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});
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