-
Notifications
You must be signed in to change notification settings - Fork 1.4k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #390 from jamestalmage/transpile-in-main-thread
Transpile in main thread
- Loading branch information
Showing
11 changed files
with
293 additions
and
94 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| var cachingTransform = require('caching-transform'); | ||
| var fs = require('fs'); | ||
| var path = require('path'); | ||
| var md5Hex = require('md5-hex'); | ||
| var stripBom = require('strip-bom'); | ||
|
|
||
| module.exports = CachingPrecompiler; | ||
|
|
||
| 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(); | ||
| } | ||
|
|
||
| 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'); | ||
|
|
||
| var powerAssert = this._createEspowerPlugin(babel); | ||
|
|
||
| function buildOptions(filename, code) { | ||
| // Extract existing source maps from the code. | ||
| var sourceMap = convertSourceMap.fromSource(code) || convertSourceMap.fromMapFileSource(code, path.dirname(filename)); | ||
|
|
||
| return { | ||
| presets: [presetStage2, presetES2015], | ||
| plugins: [powerAssert, transformRuntime], | ||
| filename: filename, | ||
| sourceMaps: true, | ||
| ast: false, | ||
| babelrc: false, | ||
| inputSourceMap: sourceMap && sourceMap.toObject() | ||
| }; | ||
| } | ||
|
|
||
| return function (code, filename, hash) { | ||
| code = code.toString(); | ||
| 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; | ||
| }; | ||
| }; | ||
|
|
||
| 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 | ||
| }); | ||
| }; | ||
|
|
||
| CachingPrecompiler.prototype._createTransform = function () { | ||
| return cachingTransform({ | ||
| factory: this._factory.bind(this), | ||
| cacheDir: this.cacheDir, | ||
| salt: new Buffer(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) | ||
| }); | ||
| }; | ||
|
|
||
| CachingPrecompiler.prototype._hash = function (code, filename, salt) { | ||
| var hash = md5Hex([code, filename, salt]); | ||
| this.filenameToHash[filename] = hash; | ||
| return hash; | ||
| }; | ||
|
|
||
| CachingPrecompiler.prototype.precompileFile = function (filename) { | ||
| if (!this.filenameToHash[filename]) { | ||
| this.transform(stripBom(fs.readFileSync(filename)), filename); | ||
| } | ||
| return this.filenameToHash[filename]; | ||
| }; | ||
|
|
||
| CachingPrecompiler.prototype.generateHashForFile = function (filename) { | ||
| var hash = {}; | ||
| hash[filename] = this.precompileFile(filename); | ||
| return hash; | ||
| }; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.