Move process.exit outside of DependencyResolver

Summary:
node-haste shouldn't ever call process.exit and should leave it up to clients to shut down properly. This change just moves it out into the `Resolver` class – I'll leave it up to David and Martin to improve error handling for the rn packager :)

public

Reviewed By: davidaurelio

Differential Revision: D2889908

fb-gh-sync-id: 6f03162c44d89e268891ef71c8db784a6f2e081d

packager/react-packager/src/Resolver/index.js

@@ -103,6 +103,11 @@ class Resolver {
     });
 
     this._polyfillModuleNames = opts.polyfillModuleNames || [];
+
+    this._depGraph.load().catch(err => {
+      console.error(err.message + '\n' + err.stack);
+      process.exit(1);
+    });
   }
 
   getShallowDependencies(entryFile) {