Add support for babel.config.mjs and .babelrc.mjs #10903
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nicolo-ribaudo
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PR: New Feature 🚀
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nicolo-ribaudo
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Dec 21, 2019
| @@ -121,6 +121,10 @@ module.exports = function(api) { | |||
| ["@babel/plugin-proposal-nullish-coalescing-operator", { loose: true }], | |||
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| convertESM ? "@babel/transform-modules-commonjs" : null, | |||
| // Until Jest supports native mjs, we must simulate it 🤷 | |||
| env === "test" || env === "development" | |||
| ? "@babel/plugin-proposal-dynamic-import" | |||
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I hate this, but this is the best way we have so far to test it 😢
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PR: Needs Docs
PR: Needs Review
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JLHwung
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Jan 10, 2020
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| function loadCjsDefault(filepath: string) { | ||
| const module = (require(filepath): mixed); | ||
| return module?.__esModule ? module.default || undefined : module; |
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Why undefined is offered as fallback here?
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I'm not sure; I only moved this code here from
babel/packages/babel-core/src/config/files/configuration.js
Lines 181 to 185 in 5b907e9
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Maybe in case someone exports false as their default config? 🤔
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Alright, we should investigate this in later PRs, or just remove it in Babel 8 because it looks suspicious.
JLHwung
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Jan 10, 2020
| await config("babel.config.mjs"); | ||
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| expect(() => loadOptions({ filename, cwd })).toThrow( | ||
| /is only supported when running Babel asynchronously/, |
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You can use toThrowErrorMatchingSnapshot() here and don't have to write the same string again.
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I can't use it because the error contains the path of the file in the tmp folder, which might change.
JLHwung
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Jan 10, 2020
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kaicataldo
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Jan 10, 2020
| } | ||
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| function guessJSModuleType(path: string): "cjs" | "mjs" | "unknown" { | ||
| switch (path.slice(-4)) { |
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Is it worth using path.extname() here?
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NOTE: This PR is a diff on top of #10507, but they can be reviewed in any order.
This PR adds support for
*.mjsconfig files: this is one of the last steps (with #10783) to support as configuration files all the extensions natively supported by nodejs.Since native ECMAScript modules can only be loaded asynchronously,
.mjsfiles can only be used when calling Babel with.parseAsync,.transformFileAsync,.transformAsync,.loadPartialConfigAsyncor.loadOptionsAsync. Synchronous calls will throw an error. This is a problem for@babel/eslint-parserwhich will still only support synchronous configuration files, but the ESLint team is working on allowing asynchronous ESLint calls.