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jestSucraseTransform.js
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jestSucraseTransform.js
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/*
* Copyright 2021 The Backstage Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const { createHash } = require('crypto');
const { transform } = require('sucrase');
const sucrasePkg = require('sucrase/package.json');
const sucrasePluginPkg = require('@sucrase/jest-plugin/package.json');
const ESM_REGEX = /\b(?:import|export)\b/;
function process(source, filePath) {
let transforms;
if (filePath.endsWith('.esm.js')) {
transforms = ['imports'];
} else if (filePath.endsWith('.js')) {
// This is a very rough filter to avoid transforming things that we quickly
// can be sure are definitely not ESM modules.
if (ESM_REGEX.test(source)) {
transforms = ['imports', 'jsx']; // JSX within .js is currently allowed
}
} else if (filePath.endsWith('.jsx')) {
transforms = ['jsx', 'imports'];
} else if (filePath.endsWith('.ts')) {
transforms = ['typescript', 'imports'];
} else if (filePath.endsWith('.tsx')) {
transforms = ['typescript', 'jsx', 'imports'];
}
// Only apply the jest transform to the test files themselves
if (transforms && filePath.includes('.test.')) {
transforms.push('jest');
}
if (transforms) {
const { code, sourceMap: map } = transform(source, {
transforms,
filePath,
disableESTransforms: true,
sourceMapOptions: {
compiledFilename: filePath,
},
});
const b64 = Buffer.from(JSON.stringify(map), 'utf8').toString('base64');
const suffix = `//# sourceMappingURL=data:application/json;charset=utf-8;base64,${b64}`;
return `${code}\n${suffix}`;
}
return source;
}
// TODO: contribute something like this to @sucrase/jest-plugin
function getCacheKey(sourceText) {
return createHash('md5')
.update(sourceText)
.update(Buffer.alloc(1))
.update(sucrasePkg.version)
.update(Buffer.alloc(1))
.update(sucrasePluginPkg.version)
.update(Buffer.alloc(1))
.update('1') // increment whenever the transform logic in this file changes
.digest('hex');
}
module.exports = { process, getCacheKey };