metro-bundler: put __tests__ blacklisting into default blacklist instead

Summary: I'd like to get rid of the function as blacklist, because it's impossible to process properly at the `jest-haste-map` level (https://github.com/facebook/jest/pull/4047). The reason we use a function in Metro bundler is because we excludes all the `__tests__` modules. However, I removed this exclusion completely, and I could build our package without any problem and with no difference in the final bundle. I can only assume, then, that this line is only here for slightly increasing performance. Therefore, I think it's reasonnable to move it as part of the default blacklist shipped with Metro bundler instead.

Reviewed By: cpojer

Differential Revision: D5434351

fbshipit-source-id: dea39f6299985143d25fcb3b7b365d793acd64a9

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

@@ -73,10 +73,7 @@ class Resolver {
     const depGraphOpts = Object.assign(Object.create(opts), {
       assetDependencies: ['react-native/Libraries/Image/AssetRegistry'],
       forceNodeFilesystemAPI: false,
-      ignoreFilePath(filepath) {
-        return filepath.indexOf('__tests__') !== -1 ||
-          (opts.blacklistRE != null && opts.blacklistRE.test(filepath));
-      },
+      ignoreFilePath: opts.blacklistRE,
       moduleOptions: {
         hasteImpl: opts.hasteImpl,
         resetCache: opts.resetCache,

packages/metro-bundler/src/blacklist.js

@@ -18,6 +18,8 @@ var sharedBlacklist = [
   /website\/node_modules\/.*/,
 
   /heapCapture\/bundle\.js/,
+
+  /.*\/__tests__\/.*/,
 ];
 
 function escapeRegExp(pattern) {

packages/metro-bundler/src/node-haste/DependencyGraph.js

@@ -51,7 +51,7 @@ type Options = {|
   +forceNodeFilesystemAPI: boolean,
   +getTransformCacheKey: GetTransformCacheKey,
   +globalTransformCache: ?GlobalTransformCache,
-  +ignoreFilePath: (filePath: string) => boolean,
+  +ignoreFilePath: RegExp,
   +maxWorkers: number,
   +moduleOptions: ModuleOptions,
   +platforms: Set<string>,