Move Babel transforms to the main process. #349
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| var cachingTransform = require('caching-transform'); | ||
| var fs = require('fs'); | ||
| var path = require('path'); | ||
| var crypto = require('crypto'); | ||
| var commonDir = require('commondir'); | ||
| var pkgDir = require('pkg-dir'); | ||
| var osTmpdir = require('os-tmpdir'); | ||
|
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| module.exports = CachingPrecompiler; | ||
| module.exports.findCacheDir = findCacheDir; | ||
| module.exports.findUniqueTempDir = findUniqueTempDir; | ||
|
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| function findCacheDir(files) { | ||
| var projectBaseDirectory = pkgDir.sync(commonDir(files)); | ||
| return path.join(projectBaseDirectory, 'node_modules', '.cache', 'ava'); | ||
| } | ||
|
|
||
| function findUniqueTempDir() { | ||
| return path.join( | ||
| osTmpdir(), | ||
| Math.random().toString(35).substr(2, 30) | ||
| ); | ||
| } | ||
|
|
||
| function CachingPrecompiler(cacheDir) { | ||
| if (!(this instanceof CachingPrecompiler)) { | ||
| throw new Error('CachingPrecompiler must be called with new'); | ||
| } | ||
| this.cacheDir = cacheDir; | ||
| this.filenameToHash = {}; | ||
| this.transform = this._createTransform(); | ||
| } | ||
|
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| CachingPrecompiler.prototype._factory = function (cacheDir) { | ||
| // This factory method is only called once per process, and only as needed, to defer loading expensive dependencies. | ||
| var babel = require('babel-core'); | ||
| var convertSourceMap = require('convert-source-map'); | ||
| var presetStage2 = require('babel-preset-stage-2'); | ||
| var presetES2015 = require('babel-preset-es2015'); | ||
| var transformRuntime = require('babel-plugin-transform-runtime'); | ||
|
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| var powerAssert = this._createEspowerPlugin(babel); | ||
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| function buildOptions(filename, code) { | ||
| // Extract existing source maps from the code. | ||
| var sourceMap = convertSourceMap.fromSource(code) || convertSourceMap.fromMapFileSource(code, path.dirname(filename)); | ||
|
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| return { | ||
| presets: [presetStage2, presetES2015], | ||
| plugins: [powerAssert, transformRuntime], | ||
| filename: filename, | ||
| sourceMaps: true, | ||
| ast: false, | ||
| inputSourceMap: sourceMap && sourceMap.toObject() | ||
| }; | ||
| } | ||
|
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||
| return function (code, filename, hash) { | ||
| var options = buildOptions(filename, code); | ||
| var result = babel.transform(code, options); | ||
| var mapFile = path.join(cacheDir, hash + '.map'); | ||
| fs.writeFileSync(mapFile, JSON.stringify(result.map)); | ||
| return result.code; | ||
| }; | ||
| }; | ||
|
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| CachingPrecompiler.prototype._createEspowerPlugin = function (babel) { | ||
| var createEspowerPlugin = require('babel-plugin-espower/create'); | ||
| var enhanceAssert = require('./enhance-assert'); | ||
|
|
||
| // initialize power-assert | ||
| return createEspowerPlugin(babel, { | ||
| patterns: enhanceAssert.PATTERNS | ||
| }); | ||
| }; | ||
|
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| CachingPrecompiler.prototype._createTransform = function () { | ||
| var self = this; | ||
|
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| return cachingTransform({ | ||
| factory: this._factory.bind(this), | ||
| cacheDir: self.cacheDir, | ||
| salt: JSON.stringify({ | ||
| 'babel-plugin-espower': require('babel-plugin-espower/package.json').version, | ||
| 'ava': require('../package.json').version, | ||
| 'babel-core': require('babel-core/package.json').version | ||
| }), | ||
| ext: '.js', | ||
| hash: this._hash.bind(this) | ||
| }); | ||
| }; | ||
|
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| CachingPrecompiler.prototype._hash = function (code, filename, salt) { | ||
| var hash = crypto | ||
| .createHash('md5') | ||
| .update(code, 'utf8') | ||
| .update(filename || 'unknown file', 'utf8') | ||
| .update(salt || '', 'utf8') | ||
| .digest('hex'); | ||
|
There was a problem hiding this comment. This could use https://github.com/sindresorhus/md5-hex now. |
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| this.filenameToHash[filename] = hash; | ||
|
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| return hash; | ||
| }; | ||
|
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| CachingPrecompiler.prototype.precompileFile = function (filename) { | ||
| if (!this.filenameToHash[filename]) { | ||
| this.transform(fs.readFileSync(filename, 'utf8'), filename); | ||
| } | ||
| return this.filenameToHash[filename]; | ||
| }; | ||
|
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| CachingPrecompiler.prototype.generateHashForFile = function (filename) { | ||
| var hash = {}; | ||
| hash[filename] = this.precompileFile(filename); | ||
| return hash; | ||
| }; | ||
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noCache=>cache. I don't like double negatives.