Add `js_file_prod` rule

Reviewed By: matryoshcow

Differential Revision: D3913439

fbshipit-source-id: fe3a30fddb4d8fcabfc88caf9b1b032189812b89

react-packager/src/JSTransformer/worker/__tests__/inline-test.js

@@ -277,5 +277,30 @@ describe('inline constants', () => {
     const {ast} = inline('arbitrary.hs', {ast: toAst(code)}, {dev: false});
     expect(toString(ast)).toEqual(code.replace(/__DEV__/, 'false'));
   });
-});
 
+  it('can work with wrapped modules', () => {
+    const code = `__arbitrary(function() {
+      var Platform = require('react-native').Platform;
+      var a = Platform.OS, b = Platform.select({android: 1, ios: 2});
+    });`;
+    const {ast} = inline(
+      'arbitrary', {code}, {dev: true, platform: 'android', isWrapped: true});
+    expect(toString(ast)).toEqual(
+      normalize(
+        code
+          .replace(/Platform\.OS/, '"android"')
+          .replace(/Platform\.select[^)]+\)/, 1)
+      )
+    );
+  });
+
+  it('can work with transformed require calls', () => {
+    const code = `__arbitrary(function() {
+      var a = require(123, 'react-native').Platform.OS;
+    });`;
+    const {ast} = inline(
+      'arbitrary', {code}, {dev: true, platform: 'android', isWrapped: true});
+    expect(toString(ast)).toEqual(
+      normalize(code.replace(/require\([^)]+\)\.Platform\.OS/, '"android"')));
+  });
+});

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

@@ -12,40 +12,87 @@
 
 const {traverse, types} = require('babel-core');
 
-const isRequireCall = (callee, firstArg) =>
-  callee.type !== 'Identifier' ||
-  callee.name !== 'require' ||
-  !firstArg ||
-  firstArg.type !== 'StringLiteral';
+class Replacement {
+  constructor() {
+    this.nameToIndex = new Map();
+    this.nextIndex = 0;
+  }
 
-function collectDependencies(ast, code) {
-  let nextIndex = 0;
-  const dependencyIndexes = new Map();
+  isRequireCall(callee, firstArg) {
+    return (
+      callee.type === 'Identifier' && callee.name === 'require' &&
+      firstArg && firstArg.type === 'StringLiteral'
+    );
+  }
 
-  function getIndex(depencyId) {
-    let index = dependencyIndexes.get(depencyId);
+  getIndex(name) {
+    let index = this.nameToIndex.get(name);
     if (index !== undefined) {
       return index;
     }
-
-    index = nextIndex++;
-    dependencyIndexes.set(depencyId, index);
+    index = this.nextIndex++;
+    this.nameToIndex.set(name, index);
     return index;
   }
 
+  getNames() {
+    return Array.from(this.nameToIndex.keys());
+  }
+
+  makeArgs(newId, oldId) {
+    return [newId, oldId];
+  }
+}
+
+class ProdReplacement {
+  constructor(names) {
+    this.replacement = new Replacement();
+    this.names = names;
+  }
+
+  isRequireCall(callee, firstArg) {
+    return (
+      callee.type === 'Identifier' && callee.name === 'require' &&
+      firstArg && firstArg.type === 'NumericLiteral'
+    );
+  }
+
+  getIndex(id) {
+    if (id in this.names) {
+      return this.replacement.getIndex(this.names[id]);
+    }
+
+    throw new Error(
+      `${id} is not a known module ID. Existing mappings: ${
+       this.names.map((n, i) => `${i} => ${n}`).join(', ')}`
+    );
+  }
+
+  getNames() {
+    return this.replacement.getNames();
+  }
+
+  makeArgs(newId) {
+    return [newId];
+  }
+}
+
+function collectDependencies(ast, replacement) {
   traverse(ast, {
     CallExpression(path) {
       const node = path.node;
       const arg = node.arguments[0];
-      if (isRequireCall(node.callee, arg)) {
-        return;
+      if (replacement.isRequireCall(node.callee, arg)) {
+        const index = replacement.getIndex(arg.value);
+        node.arguments = replacement.makeArgs(types.numericLiteral(index), arg);
       }
-
-      node.arguments[0] = types.numericLiteral(getIndex(arg.value));
     }
   });
 
-  return Array.from(dependencyIndexes.keys());
+  return replacement.getNames();
 }
 
-module.exports = collectDependencies;
+exports = module.exports =
+  ast => collectDependencies(ast, new Replacement());
+exports.forOptimization =
+  (ast, names) => collectDependencies(ast, new ProdReplacement(names));

react-packager/src/JSTransformer/worker/constant-folding.js

@@ -11,9 +11,6 @@
 const babel = require('babel-core');
 const t = babel.types;
 
-const isLiteral = binaryExpression =>
-  t.isLiteral(binaryExpression.left) && t.isLiteral(binaryExpression.right);
-
 const Conditional = {
   exit(path) {
     const node = path.node;
@@ -81,5 +78,5 @@ function constantFolding(filename, transformResult) {
   });
 }
 
+constantFolding.plugin = plugin;
 module.exports = constantFolding;
-

react-packager/src/JSTransformer/worker/inline.js

@@ -28,12 +28,15 @@ const importMap = new Map([['ReactNative', 'react-native']]);
 
 const isGlobal = (binding) => !binding;
 
-const isToplevelBinding = (binding) => isGlobal(binding) || !binding.scope.parent;
+const isToplevelBinding = (binding, isWrappedModule) =>
+  isGlobal(binding) ||
+  !binding.scope.parent ||
+  isWrappedModule && !binding.scope.parent.parent;
 
 const isRequireCall = (node, dependencyId, scope) =>
   t.isCallExpression(node) &&
   t.isIdentifier(node.callee, requirePattern) &&
-  t.isStringLiteral(node.arguments[0], t.stringLiteral(dependencyId));
+  checkRequireArgs(node.arguments, dependencyId);
 
 const isImport = (node, scope, patterns) =>
   patterns.some(pattern => {
@@ -41,21 +44,25 @@ const isImport = (node, scope, patterns) =>
     return isRequireCall(node, importName, scope);
   });
 
-function isImportOrGlobal(node, scope, patterns) {
+function isImportOrGlobal(node, scope, patterns, isWrappedModule) {
   const identifier = patterns.find(pattern => t.isIdentifier(node, pattern));
-  return identifier && isToplevelBinding(scope.getBinding(identifier.name)) ||
-         isImport(node, scope, patterns);
+  return (
+    identifier &&
+    isToplevelBinding(scope.getBinding(identifier.name), isWrappedModule) ||
+    isImport(node, scope, patterns)
+  );
 }
 
-const isPlatformOS = (node, scope) =>
+const isPlatformOS = (node, scope, isWrappedModule) =>
   t.isIdentifier(node.property, os) &&
-  isImportOrGlobal(node.object, scope, [platform]);
+  isImportOrGlobal(node.object, scope, [platform], isWrappedModule);
 
-const isReactPlatformOS = (node, scope) =>
+const isReactPlatformOS = (node, scope, isWrappedModule) =>
   t.isIdentifier(node.property, os) &&
   t.isMemberExpression(node.object) &&
   t.isIdentifier(node.object.property, platform) &&
-  isImportOrGlobal(node.object.object, scope, [React, ReactNative]);
+  isImportOrGlobal(
+    node.object.object, scope, [React, ReactNative], isWrappedModule);
 
 const isProcessEnvNodeEnv = (node, scope) =>
   t.isIdentifier(node.property, nodeEnv) &&
@@ -64,18 +71,19 @@ const isProcessEnvNodeEnv = (node, scope) =>
   t.isIdentifier(node.object.object, processId) &&
   isGlobal(scope.getBinding(processId.name));
 
-const isPlatformSelect = (node, scope) =>
+const isPlatformSelect = (node, scope, isWrappedModule) =>
   t.isMemberExpression(node.callee) &&
   t.isIdentifier(node.callee.object, platform) &&
   t.isIdentifier(node.callee.property, select) &&
-  isImportOrGlobal(node.callee.object, scope, [platform]);
+  isImportOrGlobal(node.callee.object, scope, [platform], isWrappedModule);
 
-const isReactPlatformSelect = (node, scope) =>
+const isReactPlatformSelect = (node, scope, isWrappedModule) =>
   t.isMemberExpression(node.callee) &&
   t.isIdentifier(node.callee.property, select) &&
   t.isMemberExpression(node.callee.object) &&
   t.isIdentifier(node.callee.object.property, platform) &&
-  isImportOrGlobal(node.callee.object.object, scope, [React, ReactNative]);
+  isImportOrGlobal(
+    node.callee.object.object, scope, [React, ReactNative], isWrappedModule);
 
 const isDev = (node, parent, scope) =>
   t.isIdentifier(node, dev) &&
@@ -97,22 +105,30 @@ const inlinePlugin = {
     MemberExpression(path, state) {
       const node = path.node;
       const scope = path.scope;
+      const opts = state.opts;
 
-      if (isPlatformOS(node, scope) || isReactPlatformOS(node, scope)) {
-        path.replaceWith(t.stringLiteral(state.opts.platform));
+      if (
+        isPlatformOS(node, scope, opts.isWrapped) ||
+        isReactPlatformOS(node, scope, opts.isWrapped)
+      ) {
+        path.replaceWith(t.stringLiteral(opts.platform));
       } else if (isProcessEnvNodeEnv(node, scope)) {
         path.replaceWith(
-          t.stringLiteral(state.opts.dev ? 'development' : 'production'));
+          t.stringLiteral(opts.dev ? 'development' : 'production'));
       }
     },
     CallExpression(path, state) {
       const node = path.node;
       const scope = path.scope;
       const arg = node.arguments[0];
+      const opts = state.opts;
 
-      if (isPlatformSelect(node, scope) || isReactPlatformSelect(node, scope)) {
+      if (
+        isPlatformSelect(node, scope, opts.isWrapped) ||
+        isReactPlatformSelect(node, scope, opts.isWrapped)
+      ) {
         const replacement = t.isObjectExpression(arg)
-          ? findProperty(arg, state.opts.platform)
+          ? findProperty(arg, opts.platform)
           : node;
 
         path.replaceWith(replacement);
@@ -123,6 +139,12 @@ const inlinePlugin = {
 
 const plugin = () => inlinePlugin;
 
+function checkRequireArgs(args, dependencyId) {
+  const pattern = t.stringLiteral(dependencyId);
+  return t.isStringLiteral(args[0], pattern) ||
+         t.isNumericLiteral(args[0]) && t.isStringLiteral(args[1], pattern);
+}
+
 function inline(filename, transformResult, options) {
   const code = transformResult.code;
   const babelOptions = {
@@ -141,4 +163,5 @@ function inline(filename, transformResult, options) {
       : babel.transform(code, babelOptions);
 }
 
+inline.plugin = inlinePlugin;
 module.exports = inline;

react-packager/src/ModuleGraph/worker.js

@@ -15,10 +15,16 @@ 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 series = require('async/series');
+const sourceMap = require('source-map');
 
 const collectDependencies = require('../JSTransformer/worker/collect-dependencies');
+const constantFolding = require('../JSTransformer/worker/constant-folding').plugin;
+const inline = require('../JSTransformer/worker/inline').plugin;
+const minify = require('../JSTransformer/worker/minify');
+
 const docblock = require('../node-haste/DependencyGraph/docblock');
 
 function transformModule(infile, options, outfile, callback) {
@@ -63,8 +69,7 @@ function transformModule(infile, options, outfile, callback) {
     };
 
     try {
-      mkdirp.sync(dirname(outfile));
-      fs.writeFileSync(outfile, JSON.stringify(result), 'utf8');
+      writeResult(outfile, result);
     } catch (writeError) {
       callback(writeError);
       return;
@@ -73,6 +78,35 @@ function transformModule(infile, options, outfile, callback) {
   });
 }
 
+function optimizeModule(infile, outfile, options, callback) {
+  let data;
+  try {
+    data = JSON.parse(fs.readFileSync(infile, 'utf8'));
+  } catch (readError) {
+    callback(readError);
+    return;
+  }
+
+  const transformed = data.transformed;
+  const result = Object.assign({}, data);
+  result.transformed = {};
+
+  const file = data.file;
+  const code = data.code;
+  try {
+    Object.keys(transformed).forEach(key => {
+      result.transformed[key] = optimize(transformed[key], file, code, options);
+    });
+
+    writeResult(outfile, result);
+  } catch (error) {
+    callback(error);
+    return;
+  }
+
+  callback(null);
+}
+
 function makeResult(ast, filename, sourceCode) {
   const dependencies = collectDependencies(ast);
   const file = wrapModule(ast);
@@ -101,4 +135,60 @@ function wrapModule(file) {
   return t.file(t.program([t.expressionStatement(def)]));
 }
 
+function optimize(transformed, file, originalCode, options) {
+  const optimized =
+    optimizeCode(transformed.code, transformed.map, file, options);
+
+  const dependencies = collectDependencies.forOptimization(
+    optimized.ast, transformed.dependencies);
+
+  const gen = generate(optimized.ast, {
+    comments: false,
+    compact: true,
+    filename: file,
+    sourceMaps: true,
+    sourceMapTarget: file,
+    sourceFileName: file,
+  }, originalCode);
+
+  const merged = new sourceMap.SourceMapGenerator();
+  const inputMap = new sourceMap.SourceMapConsumer(transformed.map);
+  new sourceMap.SourceMapConsumer(gen.map)
+    .eachMapping(mapping => {
+      const original = inputMap.originalPositionFor({
+        line: mapping.originalLine,
+        column: mapping.originalColumn,
+      });
+      if (original.line == null) {
+        return;
+      }
+
+      merged.addMapping({
+        generated: {line: mapping.generatedLine, column: mapping.generatedColumn},
+        original: {line: original.line, column: original.column || 0},
+        source: file,
+        name: original.name || mapping.name,
+      });
+    });
+
+  const min = minify(file, gen.code, merged.toJSON());
+  return {code: min.code, map: min.map, dependencies};
+}
+
+function optimizeCode(code, map, filename, options) {
+  const inlineOptions = Object.assign({isWrapped: true}, options);
+  return babel.transform(code, {
+    plugins: [[constantFolding], [inline, inlineOptions]],
+    babelrc: false,
+    code: false,
+    filename,
+  });
+}
+
+function writeResult(outfile, result) {
+  mkdirp.sync(dirname(outfile));
+  fs.writeFileSync(outfile, JSON.stringify(result), 'utf8');
+}
+
 exports.transformModule = transformModule;
+exports.optimizeModule = optimizeModule;