Move module minification logic to Bundler

Reviewed By: jeanlauliac

Differential Revision: D6674420

fbshipit-source-id: ee552812437da731f419871cfca9ae930fa8f6a9

packages/metro/src/Bundler/__tests__/Bundler-test.js

@@ -42,6 +42,7 @@ var commonOptions = {
   enableBabelRCLookup: true,
   extraNodeModules: {},
   platforms: defaults.platforms,
+  postMinifyProcess: e => e,
   resetCache: false,
   sourceExts: defaults.sourceExts,
   transformModulePath: '/path/to/transformer.js',
@@ -105,4 +106,26 @@ describe('Bundler', function() {
     });
     expect(b._opts.platforms).toEqual(['android', 'vr']);
   });
+
+  it('should minify code using the Transformer', async () => {
+    const code = 'arbitrary(code)';
+    const id = 'arbitrary.js';
+
+    const minifiedCode = 'minified(code)';
+    const minifiedMap = {
+      version: 3,
+      file: ['minified'],
+      sources: [],
+      mappings: '',
+    };
+
+    bundler._transformer.minify = jest
+      .fn()
+      .mockReturnValue(Promise.resolve({code: minifiedCode, map: minifiedMap}));
+
+    const result = await bundler.minifyModule(id, code, []);
+
+    expect(result.code).toEqual(minifiedCode);
+    expect(result.map).toEqual([]);
+  });
 });

packages/metro/src/Bundler/index.js

@@ -20,9 +20,16 @@ const defaults = require('../defaults');
 const fs = require('fs');
 const getTransformCacheKeyFn = require('../lib/getTransformCacheKeyFn');
 
+const {
+  compactMapping,
+  fromRawMappings,
+  toRawMappings,
+} = require('metro-source-map');
+
 import type {PostProcessModules} from '../DeltaBundler';
 import type {Options as JSTransformerOptions} from '../JSTransformer/worker';
 import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
+import type {CompactRawMappings} from '../lib/SourceMap';
 import type {MappingsMap, SourceMap} from '../lib/SourceMap';
 import type {TransformCache} from '../lib/TransformCaching';
 import type {Reporter} from '../lib/reporting';
@@ -133,8 +140,6 @@ class Bundler {
       globalTransformCache: opts.globalTransformCache,
       hasteImpl: opts.hasteImpl,
       maxWorkers: opts.maxWorkers,
-      minifyCode: this._transformer.minify.bind(this._transformer),
-      postMinifyProcess: this._opts.postMinifyProcess,
       platforms: new Set(opts.platforms),
       polyfillModuleNames: opts.polyfillModuleNames,
       projectRoots: opts.projectRoots,
@@ -246,6 +251,25 @@ class Bundler {
   getResolver(): Promise<Resolver> {
     return this._resolverPromise;
   }
+
+  async minifyModule(
+    path: string,
+    code: string,
+    map: CompactRawMappings,
+  ): Promise<{code: string, map: CompactRawMappings}> {
+    const sourceMap = fromRawMappings([{code, source: code, map, path}]).toMap(
+      undefined,
+      {},
+    );
+
+    const minified = await this._transformer.minify(path, code, sourceMap);
+    const result = await this._opts.postMinifyProcess({...minified});
+
+    return {
+      code: result.code,
+      map: result.map ? toRawMappings(result.map).map(compactMapping) : [],
+    };
+  }
 }
 
 function verifyRootExists(root) {

packages/metro/src/DeltaBundler/DeltaTransformer.js

@@ -451,11 +451,7 @@ class DeltaTransformer extends EventEmitter {
     }
 
     const {code, map} = transformOptions.minify
-      ? await this._resolver.minifyModule(
-          module.path,
-          wrappedCode,
-          metadata.map,
-        )
+      ? await this._bundler.minifyModule(module.path, wrappedCode, metadata.map)
       : {code: wrappedCode, map: metadata.map};
 
     const id = this._getModuleId(module.path);

packages/metro/src/Resolver/__tests__/Resolver-test.js

@@ -1,98 +0,0 @@
-/**
- * Copyright (c) 2015-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.
- *
- * @emails oncall+javascript_foundation
- * @format
- */
-
-'use strict';
-
-jest.useRealTimers();
-
-jest.mock('path');
-
-const DependencyGraph = jest.fn();
-jest.setMock('../../node-haste/DependencyGraph', DependencyGraph);
-let Module;
-
-describe('Resolver', function() {
-  let Resolver, path;
-
-  beforeEach(function() {
-    Resolver = require('../');
-    path = require('path');
-    DependencyGraph.mockClear();
-
-    Module = jest.fn(function() {
-      this.isPolyfill = jest.fn().mockReturnValue(false);
-      this.isJSON = jest.fn().mockReturnValue(false);
-    });
-
-    DependencyGraph.load = jest
-      .fn()
-      .mockImplementation(opts => Promise.resolve(new DependencyGraph(opts)));
-
-    DependencyGraph.prototype.createPolyfill = jest.fn();
-    DependencyGraph.prototype.getDependencies = jest.fn();
-
-    // For the polyfillDeps
-    path.join = jest.fn((a, b) => b);
-
-    DependencyGraph.prototype.load = jest.fn(() => Promise.resolve());
-  });
-
-  function createModule(id, dependencies) {
-    var module = new Module({});
-    module.path = id;
-
-    return module;
-  }
-
-  describe('minification:', () => {
-    const code = 'arbitrary(code)';
-    const id = 'arbitrary.js';
-    let depResolver, minifyCode, module, sourceMap;
-
-    beforeEach(() => {
-      minifyCode = jest.fn((filename, code, map) =>
-        Promise.resolve({code, map}),
-      );
-      module = createModule(id);
-      module.path = '/arbitrary/path.js';
-
-      sourceMap = [];
-      return Resolver.load({
-        projectRoot: '/root',
-        minifyCode,
-        postMinifyProcess: e => e,
-      }).then(r => {
-        depResolver = r;
-      });
-    });
-
-    it('should use minified code', () => {
-      expect.assertions(2);
-      const minifiedCode = 'minified(code)';
-      const minifiedMap = {
-        version: 3,
-        file: ['minified'],
-        sources: [],
-        mappings: '',
-      };
-      minifyCode.mockReturnValue(
-        Promise.resolve({code: minifiedCode, map: minifiedMap}),
-      );
-      return depResolver
-        .minifyModule(module.path, code, sourceMap)
-        .then(({code, map}) => {
-          expect(code).toEqual(minifiedCode);
-          expect(map).toEqual([]);
-        });
-    });
-  });
-});

packages/metro/src/Resolver/index.js

@@ -14,16 +14,7 @@
 
 const DependencyGraph = require('../node-haste/DependencyGraph');
 
-const {
-  compactMapping,
-  fromRawMappings,
-  toRawMappings,
-} = require('metro-source-map');
-
-import type {PostMinifyProcess} from '../Bundler';
-import typeof {minify as MinifyCode} from '../JSTransformer/worker';
 import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
-import type {CompactRawMappings} from '../lib/SourceMap';
 import type {
   TransformCache,
   GetTransformCacheKey,
@@ -41,8 +32,6 @@ type Options = {|
   +globalTransformCache: ?GlobalTransformCache,
   +hasteImpl?: ?HasteImpl,
   +maxWorkers: number,
-  +minifyCode: MinifyCode,
-  +postMinifyProcess: PostMinifyProcess,
   +platforms: Set<string>,
   +polyfillModuleNames?: Array<string>,
   +projectRoots: $ReadOnlyArray<string>,
@@ -57,12 +46,8 @@ type Options = {|
 
 class Resolver {
   _depGraph: DependencyGraph;
-  _minifyCode: MinifyCode;
-  _postMinifyProcess: PostMinifyProcess;
 
   constructor(opts: Options, depGraph: DependencyGraph) {
-    this._minifyCode = opts.minifyCode;
-    this._postMinifyProcess = opts.postMinifyProcess;
     this._depGraph = depGraph;
   }
 
@@ -92,25 +77,6 @@ class Resolver {
     return new Resolver(opts, depGraph);
   }
 
-  async minifyModule(
-    path: string,
-    code: string,
-    map: CompactRawMappings,
-  ): Promise<{code: string, map: CompactRawMappings}> {
-    const sourceMap = fromRawMappings([{code, source: code, map, path}]).toMap(
-      undefined,
-      {},
-    );
-
-    const minified = await this._minifyCode(path, code, sourceMap);
-    const result = await this._postMinifyProcess({...minified});
-
-    return {
-      code: result.code,
-      map: result.map ? toRawMappings(result.map).map(compactMapping) : [],
-    };
-  }
-
   getDependencyGraph(): DependencyGraph {
     return this._depGraph;
   }