Add `js_file` rule

Reviewed By: matryoshcow

Differential Revision: D3900455

fbshipit-source-id: 61384ade035db978ef3ca258e4c0109bcb450692

react-packager/src/JSTransformer/index.js

@@ -36,6 +36,13 @@ const validateOpts = declareOpts({
     type: 'number',
     default: DEFAULT_MAX_CALL_TIME,
   },
+  worker: {
+    type: 'string',
+  },
+  methods: {
+    type: 'array',
+    default: [],
+  },
 });
 
 const maxConcurrentWorkers = ((cores, override) => {
@@ -50,33 +57,47 @@ const maxConcurrentWorkers = ((cores, override) => {
     return Math.floor(cores * 0.75);
   }
   if (cores < 24) {
-    return Math.floor(3/8 * cores + 3); // between cores *.75 and cores / 2
+    return Math.floor(3 / 8 * cores + 3); // between cores *.75 and cores / 2
   }
   return cores / 2;
 })(os.cpus().length, process.env.REACT_NATIVE_MAX_WORKERS);
 
+function makeFarm(worker, methods, timeout) {
+  return workerFarm(
+    {
+      autoStart: true,
+      maxConcurrentCallsPerWorker: 1,
+      maxConcurrentWorkers: maxConcurrentWorkers,
+      maxCallsPerWorker: MAX_CALLS_PER_WORKER,
+      maxCallTime: timeout,
+      maxRetries: MAX_RETRIES,
+    },
+    worker,
+    methods,
+  );
+}
+
 class Transformer {
   constructor(options) {
     const opts = this._opts = validateOpts(options);
 
     const {transformModulePath} = opts;
 
-    if (transformModulePath) {
+    if (opts.worker) {
+      this._workers =
+        makeFarm(opts.worker, opts.methods, opts.transformTimeoutInterval);
+      opts.methods.forEach(name => {
+        this[name] = this._workers[name];
+      });
+    }
+    else if (transformModulePath) {
       this._transformModulePath = require.resolve(transformModulePath);
 
-      this._workers = workerFarm(
-        {
-          autoStart: true,
-          maxConcurrentCallsPerWorker: 1,
-          maxConcurrentWorkers: maxConcurrentWorkers,
-          maxCallsPerWorker: MAX_CALLS_PER_WORKER,
-          maxCallTime: opts.transformTimeoutInterval,
-          maxRetries: MAX_RETRIES,
-        },
+      this._workers = makeFarm(
         require.resolve('./worker'),
-        ['minify', 'transformAndExtractDependencies']
+        ['minify', 'transformAndExtractDependencies'],
+        opts.transformTimeoutInterval,
       );
-
       this._transform = Promise.denodeify(this._workers.transformAndExtractDependencies);
       this.minify = Promise.denodeify(this._workers.minify);
     }
@@ -111,7 +132,7 @@ class Transformer {
           const timeoutErr = new Error(
             `TimeoutError: transforming ${fileName} took longer than ` +
             `${this._opts.transformTimeoutInterval / 1000} seconds.\n` +
-            `You can adjust timeout via the 'transformTimeoutInterval' option`
+            'You can adjust timeout via the \'transformTimeoutInterval\' option'
           );
           timeoutErr.type = 'TimeoutError';
           throw timeoutErr;

react-packager/src/JSTransformer/worker/collect-dependencies.js

@@ -0,0 +1,51 @@
+/**
+ * Copyright (c) 2016-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+'use strict';
+
+// RUNS UNTRANSFORMED IN A WORKER PROCESS. ONLY USE NODE 4 COMPATIBLE FEATURES!
+
+const {traverse, types} = require('babel-core');
+
+const isRequireCall = (callee, firstArg) =>
+  callee.type !== 'Identifier' ||
+  callee.name !== 'require' ||
+  !firstArg ||
+  firstArg.type !== 'StringLiteral';
+
+function collectDependencies(ast, code) {
+  let nextIndex = 0;
+  const dependencyIndexes = new Map();
+
+  function getIndex(depencyId) {
+    let index = dependencyIndexes.get(depencyId);
+    if (index !== undefined) {
+      return index;
+    }
+
+    index = nextIndex++;
+    dependencyIndexes.set(depencyId, index);
+    return index;
+  }
+
+  traverse(ast, {
+    CallExpression(path) {
+      const node = path.node;
+      const arg = node.arguments[0];
+      if (isRequireCall(node.callee, arg)) {
+        return;
+      }
+
+      node.arguments[0] = types.numericLiteral(getIndex(arg.value));
+    }
+  });
+
+  return Array.from(dependencyIndexes.keys());
+}
+
+module.exports = collectDependencies;

react-packager/src/ModuleGraph/worker.js

@@ -0,0 +1,104 @@
+/**
+ * Copyright (c) 2016-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+'use strict';
+
+// RUNS UNTRANSFORMED IN A WORKER PROCESS. ONLY USE NODE 4 COMPATIBLE FEATURES!
+
+const fs = require('fs');
+const dirname = require('path').dirname;
+
+const babel = require('babel-core');
+const generate = require('babel-generator').default;
+const series = require('async/series');
+const mkdirp = require('mkdirp');
+
+const collectDependencies = require('../JSTransformer/worker/collect-dependencies');
+const docblock = require('../node-haste/DependencyGraph/docblock');
+
+function transformModule(infile, options, outfile, callback) {
+  let code, transform;
+  try {
+    transform = require(options.transform);
+    code = fs.readFileSync(infile, 'utf8');
+  } catch (readError) {
+    callback(readError);
+    return;
+  }
+
+  const filename = options.filename || infile;
+  const variants = options.variants || {default: {}};
+
+  const tasks = {};
+  Object.keys(variants).forEach(name => {
+    tasks[name] = cb => transform({
+      filename,
+      sourceCode: code,
+      options: variants[name],
+    }, cb);
+  });
+
+  series(tasks, (error, transformed) => {
+    if (error) {
+      callback(error);
+      return;
+    }
+
+    Object.keys(transformed).forEach(key => {
+      transformed[key] = makeResult(transformed[key].ast, filename, code);
+    });
+
+    const annotations = docblock.parseAsObject(docblock.extract(code));
+
+    const result = {
+      file: filename,
+      code,
+      transformed,
+      hasteID: annotations.providesModule || annotations.provide || null,
+    };
+
+    try {
+      mkdirp.sync(dirname(outfile));
+      fs.writeFileSync(outfile, JSON.stringify(result), 'utf8');
+    } catch (writeError) {
+      callback(writeError);
+      return;
+    }
+    callback(null);
+  });
+}
+
+function makeResult(ast, filename, sourceCode) {
+  const dependencies = collectDependencies(ast);
+  const file = wrapModule(ast);
+
+  const gen = generate(file, {
+    comments: false,
+    compact: true,
+    filename,
+    sourceMaps: true,
+    sourceMapTarget: filename,
+    sourceFileName: filename,
+  }, sourceCode);
+  return {code: gen.code, map: gen.map, dependencies};
+}
+
+function wrapModule(file) {
+  const p = file.program;
+  const t = babel.types;
+  const factory = t.functionExpression(t.identifier(''), [
+    t.identifier('require'),
+    t.identifier('module'),
+    t.identifier('global'),
+    t.identifier('exports')
+  ], t.blockStatement(p.body, p.directives));
+  const def = t.callExpression(t.identifier('__d'), [factory]);
+  return t.file(t.program([t.expressionStatement(def)]));
+}
+
+exports.transformModule = transformModule;