104 lines
2.9 KiB
JavaScript
104 lines
2.9 KiB
JavaScript
'use strict';
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const path = require('path');
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const fs = require('fs');
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const convertSourceMap = require('convert-source-map');
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const cachingTransform = require('caching-transform');
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const packageHash = require('package-hash');
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const stripBomBuf = require('strip-bom-buf');
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const autoBind = require('auto-bind');
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const md5Hex = require('md5-hex');
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function getSourceMap(filePath, code) {
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let sourceMap = convertSourceMap.fromSource(code);
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if (!sourceMap) {
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const dirPath = path.dirname(filePath);
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sourceMap = convertSourceMap.fromMapFileSource(code, dirPath);
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}
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if (sourceMap) {
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sourceMap = sourceMap.toObject();
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}
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return sourceMap;
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}
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class CachingPrecompiler {
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constructor(options) {
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autoBind(this);
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this.getBabelOptions = options.getBabelOptions;
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this.babelCacheKeys = options.babelCacheKeys;
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this.cacheDirPath = options.path;
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this.fileHashes = {};
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this.transform = this._createTransform();
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}
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precompileFile(filePath) {
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if (!this.fileHashes[filePath]) {
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const source = stripBomBuf(fs.readFileSync(filePath));
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this.transform(source, filePath);
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}
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return this.fileHashes[filePath];
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}
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// Conditionally called by caching-transform when precompiling is required
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_init() {
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this.babel = require('babel-core');
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return this._transform;
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}
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_transform(code, filePath, hash) {
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code = code.toString();
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let result;
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const originalBabelDisableCache = process.env.BABEL_DISABLE_CACHE;
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try {
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// Disable Babel's cache. AVA has good cache management already.
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process.env.BABEL_DISABLE_CACHE = '1';
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result = this.babel.transform(code, Object.assign(this.getBabelOptions(), {
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inputSourceMap: getSourceMap(filePath, code),
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filename: filePath,
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sourceMaps: true,
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ast: false
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}));
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} finally {
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// Restore the original value. It is passed to workers, where users may
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// not want Babel's cache to be disabled.
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process.env.BABEL_DISABLE_CACHE = originalBabelDisableCache;
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}
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// Save source map
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const mapPath = path.join(this.cacheDirPath, `${hash}.js.map`);
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fs.writeFileSync(mapPath, JSON.stringify(result.map));
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// Append source map comment to transformed code
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// So that other libraries (like nyc) can find the source map
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const dirPath = path.dirname(filePath);
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const relativeMapPath = path.relative(dirPath, mapPath);
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const comment = convertSourceMap.generateMapFileComment(relativeMapPath);
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return `${result.code}\n${comment}`;
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}
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_createTransform() {
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const salt = packageHash.sync([
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require.resolve('../package.json'),
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require.resolve('babel-core/package.json')
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], this.babelCacheKeys);
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return cachingTransform({
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factory: this._init,
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cacheDir: this.cacheDirPath,
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hash: this._generateHash,
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salt,
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ext: '.js'
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});
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}
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_generateHash(code, filePath, salt) {
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const hash = md5Hex([code, filePath, salt]);
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this.fileHashes[filePath] = hash;
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return hash;
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}
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}
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module.exports = CachingPrecompiler;
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