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Internal Jest setup - improve workaround for Babel registration (#36838)

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Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/36838

Changelog: [Internal]

Reviewed By: GijsWeterings

Differential Revision: D44715939

fbshipit-source-id: fe3cbd934a39666e5590962941b1927b0f8e2610
This commit is contained in:
Rob Hogan 2023-04-11 10:08:53 -07:00 committed by Facebook GitHub Bot
parent 6f4bfdd3d6
commit 3c9d915330
1 changed files with 20 additions and 24 deletions
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44
jest/preprocessor.js
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@ -12,38 +12,34 @@
'use strict';
const babelRegisterOnly = require('metro-babel-register');
const metroBabelRegister = require('metro-babel-register');
const createCacheKeyFunction =
require('@jest/create-cache-key-function').default;
const {transformSync: babelTransformSync} = require('@babel/core');
const generate = require('@babel/generator').default;
const nodeFiles = new RegExp(
[
'/metro(?:-[^/]*)?/', // metro, metro-core, metro-source-map, metro-etc.
].join('|'),
);
// Files matching this pattern will be transformed with the Node JS Babel
// transformer, rather than with the React Native Babel transformer. Scripts
// intended to run through Node JS should be included here.
const nodeFiles = /[\\/]metro(?:-[^/]*)[\\/]/;
// Get Babel config from metro-babel-register, without registering against
// `require`. This is used below to configure babelTransformSync under Jest.
const nodeOptions = babelRegisterOnly.config([nodeFiles]);
// Get Babel config from metro-babel-register, without registering a require
// hook. This is used below to configure babelTransformSync under Jest.
const {only: _, ...nodeBabelOptions} = metroBabelRegister.config([]);
let transformer;
try {
transformer = require('metro-react-native-babel-transformer');
} catch (e) {
if (e.name !== 'SyntaxError') {
throw e;
}
// [fbsource only] When Metro dependency versions match the latest release,
// they are loaded from source (facebook/metro lives inside Meta's monorepo).
// We need babel-register to use the transformer in this configuration file.
babelRegisterOnly([]);
transformer = require('metro-react-native-babel-transformer');
// Register Babel to allow the transformer itself to be loaded from source.
if (process.env.FBSOURCE_ENV) {
// Internal: Use `@fb-scripts/babel-register` to re-use internal
// registration, rather than potentially clobbering it and conflicting with
// other Jest projects running in the same process.
// This package should *NOT* be a dependency of `@react-native/monorepo`.
// $FlowIgnore[cannot-resolve-module]
require('@fb-scripts/babel-register');
} else {
metroBabelRegister([nodeFiles]);
}
const transformer = require('metro-react-native-babel-transformer');
module.exports = {
process(src /*: string */, file /*: string */) /*: {code: string, ...} */ {
@ -52,7 +48,7 @@ module.exports = {
return babelTransformSync(src, {
filename: file,
sourceType: 'script',
...nodeOptions,
...nodeBabelOptions,
ast: false,
});
}