Remove cyclic dependency when getting the transform options

Reviewed By: davidaurelio

Differential Revision: D6231766

fbshipit-source-id: ae200a4507febcd47bcc636d0e62f01eb6a93477

packages/metro-bundler/src/Bundler/index.js

@@ -48,10 +48,14 @@ export type BundlingOptions = {|
   +transformer: JSTransformerOptions,
 |};
 
+type TransformOptions = {|
+  +inlineRequires: {+blacklist: {[string]: true}} | boolean,
+|};
+
 export type ExtraTransformOptions = {
   +preloadedModules?: {[path: string]: true} | false,
   +ramGroups?: Array<string>,
-  +transform?: {+inlineRequires?: {+blacklist: {[string]: true}} | boolean},
+  +transform?: TransformOptions,
 };
 
 export type GetTransformOptionsOpts = {|
@@ -594,14 +598,17 @@ class Bundler {
     transformerOptions?: JSTransformerOptions,
   }): Promise<Array<string>> {
     if (!transformerOptions) {
-      transformerOptions = (await this.getTransformOptions(rootEntryFile, {
-        dev,
-        generateSourceMaps,
-        hot,
-        minify,
-        platform,
-        prependPolyfills: false,
-      })).transformer;
+      transformerOptions = (await this._getLegacyTransformOptions_Do_Not_Use(
+        rootEntryFile,
+        {
+          dev,
+          generateSourceMaps,
+          hot,
+          minify,
+          platform,
+          prependPolyfills: false,
+        },
+      )).transformer;
     }
 
     const notNullOptions = transformerOptions;
@@ -642,7 +649,7 @@ class Bundler {
     +prependPolyfills: boolean,
     onProgress?: ?(finishedModules: number, totalModules: number) => mixed,
   }): Promise<ResolutionResponse<Module, BundlingOptions>> {
-    const bundlingOptions: BundlingOptions = await this.getTransformOptions(
+    const bundlingOptions: BundlingOptions = await this._getLegacyTransformOptions_Do_Not_Use(
       rootEntryFile,
       {
         dev,
@@ -845,7 +852,51 @@ class Bundler {
     });
   }
 
-  async getTransformOptions(
+  /**
+   * Returns the transform options related to a specific entry file, by calling
+   * the config parameter getTransformOptions().
+   */
+  async getTransformOptionsForEntryFile(
+    entryFile: string,
+    options: {dev: boolean, platform: ?string},
+    getDependencies: string => Promise<Array<string>>,
+  ): Promise<TransformOptions> {
+    if (!this._getTransformOptions) {
+      return {
+        inlineRequires: false,
+      };
+    }
+
+    const {transform} = await this._getTransformOptions(
+      [entryFile],
+      {dev: options.dev, hot: true, platform: options.platform},
+      getDependencies,
+    );
+
+    return transform || {inlineRequires: false};
+  }
+
+  /*
+   * Helper method to return the global transform options that are kept in the
+   * Bundler.
+   */
+  getGlobalTransformOptions(): {
+    enableBabelRCLookup: boolean,
+    projectRoot: string,
+  } {
+    return {
+      enableBabelRCLookup: this._opts.enableBabelRCLookup,
+      projectRoot: this._projectRoots[0],
+    };
+  }
+
+  /*
+   * Old logic to get the transform options, which automatically calculates
+   * the dependencies of the inlineRequires and preloadedModules params.
+   *
+   * TODO: Remove this.
+   */
+  async _getLegacyTransformOptions_Do_Not_Use(
     mainModuleName: string,
     options: {|
       dev: boolean,

packages/metro-bundler/src/DeltaBundler/DeltaCalculator.js

@@ -137,27 +137,65 @@ class DeltaCalculator extends EventEmitter {
   }
 
   /**
-   * Returns the options options object that is used by ResoltionRequest to
-   * read all the modules. This can be used by external objects to read again
+   * Returns the options object that is used by the transformer to parse
+   * all the modules. This can be used by external objects to read again
    * any module very fast (since the options object instance will be the same).
    */
   async getTransformerOptions(): Promise<JSTransformerOptions> {
     if (!this._transformerOptions) {
-      this._transformerOptions = (await this._bundler.getTransformOptions(
-        this._options.entryFile,
-        {
-          dev: this._options.dev,
-          generateSourceMaps: false,
-          hot: this._options.hot,
-          minify: this._options.minify,
-          platform: this._options.platform,
-          prependPolyfills: false,
-        },
-      )).transformer;
+      this._transformerOptions = await this._calcTransformerOptions();
     }
     return this._transformerOptions;
   }
 
+  async _calcTransformerOptions(): Promise<JSTransformerOptions> {
+    const {
+      enableBabelRCLookup,
+      projectRoot,
+    } = this._bundler.getGlobalTransformOptions();
+
+    const transformOptionsForBlacklist = {
+      dev: this._options.dev,
+      minify: this._options.minify,
+      platform: this._options.platform,
+      transform: {
+        enableBabelRCLookup,
+        dev: this._options.dev,
+        generateSourceMaps: this._options.generateSourceMaps,
+        hot: this._options.hot,
+        inlineRequires: false,
+        platform: this._options.platform,
+        projectRoot,
+      },
+    };
+
+    const {
+      inlineRequires,
+    } = await this._bundler.getTransformOptionsForEntryFile(
+      this._options.entryFile,
+      {dev: this._options.dev, platform: this._options.platform},
+      async path => {
+        const {added} = await initialTraverseDependencies(
+          path,
+          this._dependencyGraph,
+          transformOptionsForBlacklist,
+          new Map(),
+        );
+
+        return [path, ...added];
+      },
+    );
+
+    // $FlowFixMe flow does not recognize well Object.assign() return types.
+    return {
+      ...transformOptionsForBlacklist,
+      transform: {
+        ...transformOptionsForBlacklist.transform,
+        inlineRequires: inlineRequires || false,
+      },
+    };
+  }
+
   /**
    * Returns all the dependency edges from the graph. Each edge contains the
    * needed information to do the traversing (dependencies, inverseDependencies)

packages/metro-bundler/src/DeltaBundler/__tests__/DeltaCalculator-test.js

@@ -102,12 +102,17 @@ describe('DeltaCalculator', () => {
       },
     );
 
-    Bundler.prototype.getTransformOptions.mockImplementation(async () => {
-      return {
-        transformer: {},
-      };
+    Bundler.prototype.getGlobalTransformOptions.mockReturnValue({
+      enableBabelRCLookup: false,
+      projectRoot: '/foo',
     });
 
+    Bundler.prototype.getTransformOptionsForEntryFile.mockReturnValue(
+      Promise.resolve({
+        inlineRequires: false,
+      }),
+    );
+
     deltaCalculator = new DeltaCalculator(
       bundlerMock,
       dependencyGraph,
@@ -291,4 +296,69 @@ describe('DeltaCalculator', () => {
 
     expect(traverseDependencies.mock.calls[0][0]).toEqual(['/bundle']);
   });
+
+  describe('getTransformerOptions()', () => {
+    it('should calculate the transform options correctly', async () => {
+      expect(await deltaCalculator.getTransformerOptions()).toEqual({
+        dev: true,
+        minify: false,
+        platform: 'ios',
+        transform: {
+          dev: true,
+          enableBabelRCLookup: false,
+          generateSourceMaps: false,
+          hot: true,
+          inlineRequires: false,
+          platform: 'ios',
+          projectRoot: '/foo',
+        },
+      });
+    });
+
+    it('should handle inlineRequires=true correctly', async () => {
+      Bundler.prototype.getTransformOptionsForEntryFile.mockReturnValue(
+        Promise.resolve({
+          inlineRequires: true,
+        }),
+      );
+
+      expect(await deltaCalculator.getTransformerOptions()).toEqual({
+        dev: true,
+        minify: false,
+        platform: 'ios',
+        transform: {
+          dev: true,
+          enableBabelRCLookup: false,
+          generateSourceMaps: false,
+          hot: true,
+          inlineRequires: true,
+          platform: 'ios',
+          projectRoot: '/foo',
+        },
+      });
+    });
+
+    it('should handle an inline requires blacklist correctly', async () => {
+      Bundler.prototype.getTransformOptionsForEntryFile.mockReturnValue(
+        Promise.resolve({
+          inlineRequires: {blacklist: {'/bar': true, '/baz': true}},
+        }),
+      );
+
+      expect(await deltaCalculator.getTransformerOptions()).toEqual({
+        dev: true,
+        minify: false,
+        platform: 'ios',
+        transform: {
+          dev: true,
+          enableBabelRCLookup: false,
+          generateSourceMaps: false,
+          hot: true,
+          inlineRequires: {blacklist: {'/bar': true, '/baz': true}},
+          platform: 'ios',
+          projectRoot: '/foo',
+        },
+      });
+    });
+  });
 });