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🚧🚀 Add esbuild+babel caching to tests (ampproject#33119)
* Add esbuild+babel caching to tests * Cleanup * Add build-system/common/esbuild-babel.js * Fix path * Fix type * Optimize regex * Fix digesting
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| /** | ||
| * Copyright 2021 The AMP HTML Authors. All Rights Reserved. | ||
| * | ||
| * 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 babel = require('@babel/core'); | ||
| const crypto = require('crypto'); | ||
| const fs = require('fs'); | ||
| const path = require('path'); | ||
|
|
||
| /** | ||
| * Used to cache babel transforms done by esbuild. | ||
| * @private @const {!Map<string, {hash: string, promise: Promise<{contents: string}>}>} | ||
| */ | ||
| const transformCache = new Map(); | ||
|
|
||
| /** | ||
| * Used to cache file reads done by esbuild, since it can issue multiple | ||
| * "loads" per file. This batches consecutive reads into a single, and then | ||
| * clears its cache item for the next load. | ||
| * @private @const {!Map<string, Promise<{hash: string, contents: string}>>} | ||
| */ | ||
| const readCache = new Map(); | ||
|
|
||
| /** | ||
| * Creates a babel plugin for esbuild for the given caller. Optionally enables | ||
| * caching to speed up transforms. | ||
| * @param {string} callerName | ||
| * @param {boolean} enableCache | ||
| * @param {function()} preSetup | ||
| * @param {function()} postLoad | ||
| * @return {!Object} | ||
| */ | ||
| function getEsbuildBabelPlugin( | ||
| callerName, | ||
| enableCache, | ||
| preSetup = () => {}, | ||
| postLoad = () => {} | ||
| ) { | ||
| function sha256(contents) { | ||
| if (!enableCache) { | ||
| return ''; | ||
| } | ||
| const hash = crypto.createHash('sha256'); | ||
| hash.update(callerName); | ||
| hash.update(contents); | ||
| return hash.digest('hex'); | ||
| } | ||
|
|
||
| function batchedRead(path) { | ||
| let read = readCache.get(path); | ||
| if (!read) { | ||
| read = fs.promises | ||
| .readFile(path) | ||
| .then((contents) => { | ||
| return { | ||
| contents, | ||
| hash: sha256(contents), | ||
| }; | ||
| }) | ||
| .finally(() => { | ||
| readCache.delete(path); | ||
| }); | ||
| readCache.set(path, read); | ||
| } | ||
| return read; | ||
| } | ||
|
|
||
| function transformContents(filepath, contents, hash) { | ||
| if (enableCache) { | ||
| const cached = transformCache.get(filepath); | ||
| if (cached && cached.hash === hash) { | ||
| return cached.promise; | ||
| } | ||
| } | ||
|
|
||
| const babelOptions = | ||
| babel.loadOptions({ | ||
| caller: {name: callerName}, | ||
| filename: filepath, | ||
| sourceFileName: path.basename(filepath), | ||
| }) || undefined; | ||
| const promise = babel | ||
| .transformAsync(contents, babelOptions) | ||
| .then((result) => { | ||
| return {contents: result.code}; | ||
| }); | ||
|
|
||
| if (enableCache) { | ||
| transformCache.set(filepath, {hash, promise}); | ||
| } | ||
|
|
||
| return promise.finally(postLoad); | ||
| } | ||
|
|
||
| return { | ||
| name: 'babel', | ||
| async setup(build) { | ||
| preSetup(); | ||
|
|
||
| build.onLoad({filter: /\.[cm]?js$/, namespace: ''}, async (file) => { | ||
| const {path} = file; | ||
| const {contents, hash} = await batchedRead(path); | ||
| return transformContents(path, contents, hash); | ||
| }); | ||
| }, | ||
| }; | ||
| } | ||
|
|
||
| module.exports = { | ||
| getEsbuildBabelPlugin, | ||
| }; |
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