packager: Resolver: remove opt defaults, simplify load()

Summary: Not having default everywhere (keeping them at the top level instead) makes for a code that is easier to understand, and more robust as different pieces of code cannot default to different values. This changeset also unifies the option types (ex. `platform`).

Reviewed By: cpojer

Differential Revision: D4688882

fbshipit-source-id: b5f407601386336f937a0ac1f68c666acc89dfd8

packager/src/Bundler/index.js

@@ -24,6 +24,7 @@ const ModuleTransport = require('../lib/ModuleTransport');
 const imageSize = require('image-size');
 const path = require('path');
 const denodeify = require('denodeify');
+const defaults = require('../../defaults');
 
 const {
   sep: pathSeparator,
@@ -179,10 +180,11 @@ class Bundler {
       hasteImpl: opts.hasteImpl,
       minifyCode: this._transformer.minify,
       moduleFormat: opts.moduleFormat,
-      platforms: opts.platforms,
+      platforms: new Set(opts.platforms),
       polyfillModuleNames: opts.polyfillModuleNames,
       projectRoots: opts.projectRoots,
-      providesModuleNodeModules: opts.providesModuleNodeModules,
+      providesModuleNodeModules:
+        opts.providesModuleNodeModules || defaults.providesModuleNodeModules,
       reporter: opts.reporter,
       resetCache: opts.resetCache,
       transformCode:

packager/src/Resolver/index.js

@@ -33,19 +33,19 @@ type Options = {
   assetExts: Array<string>,
   blacklistRE?: RegExp,
   cache: Cache,
-  extraNodeModules?: {},
+  extraNodeModules: ?{},
   getTransformCacheKey: GetTransformCacheKey,
   globalTransformCache: ?GlobalTransformCache,
   hasteImpl?: HasteImpl,
   minifyCode: MinifyCode,
-  platforms: Array<string>,
+  platforms: Set<string>,
   polyfillModuleNames?: Array<string>,
   projectRoots: Array<string>,
-  providesModuleNodeModules?: Array<string>,
+  providesModuleNodeModules: Array<string>,
   reporter: Reporter,
   resetCache: boolean,
   transformCode: TransformCode,
-  watch?: boolean,
+  watch: boolean,
 };
 
 class Resolver {
@@ -61,15 +61,10 @@ class Resolver {
   }
 
   static async load(opts: Options): Promise<Resolver> {
-    const depGraph = await DependencyGraph.load({
+    const depGraphOpts = Object.assign(Object.create(opts), {
       assetDependencies: ['react-native/Libraries/Image/AssetRegistry'],
-      assetExts: opts.assetExts,
-      cache: opts.cache,
-      extraNodeModules: opts.extraNodeModules,
       extensions: ['js', 'json'],
       forceNodeFilesystemAPI: false,
-      getTransformCacheKey: opts.getTransformCacheKey,
-      globalTransformCache: opts.globalTransformCache,
       ignoreFilePath(filepath) {
         return filepath.indexOf('__tests__') !== -1 ||
           (opts.blacklistRE != null && opts.blacklistRE.test(filepath));
@@ -80,17 +75,11 @@ class Resolver {
         hasteImpl: opts.hasteImpl,
         resetCache: opts.resetCache,
       },
-      platforms: new Set(opts.platforms),
       preferNativePlatform: true,
-      providesModuleNodeModules:
-        opts.providesModuleNodeModules || defaults.providesModuleNodeModules,
-      reporter: opts.reporter,
-      resetCache: opts.resetCache,
       roots: opts.projectRoots,
-      transformCode: opts.transformCode,
       useWatchman: true,
-      watch: opts.watch || false,
     });
+    const depGraph = await DependencyGraph.load(depGraphOpts);
     return new Resolver(opts, depGraph);
   }
 

packager/src/node-haste/index.js

@@ -53,7 +53,7 @@ type Options = {
   assetExts: Array<string>,
   cache: Cache,
   extensions: Array<string>,
-  extraNodeModules: ?Object,
+  extraNodeModules: ?{},
   forceNodeFilesystemAPI: boolean,
   getTransformCacheKey: GetTransformCacheKey,
   globalTransformCache: ?GlobalTransformCache,
@@ -87,7 +87,7 @@ class DependencyGraph extends EventEmitter {
     initialModuleMap: ModuleMap,
   }) {
     super();
-    this._opts = {...config.opts};
+    this._opts = config.opts;
     this._haste = config.haste;
     this._hasteFS = config.initialHasteFS;
     this._moduleMap = config.initialModuleMap;