packager: HasteMap: @flow + fixes

Summary: Add Flow types, revealing a few problems, such as `isHaste` having the wrong return value in the "pseudo-mocks". But since the buck worker is in fact working, I guess these functions were never called... The point of typing this file is that I'm going to start aggressively pruning dead code in `node-haste` and hopefully, eventually, get rid of `Moduleish` and `Packageish`.

Reviewed By: davidaurelio

Differential Revision: D5052379

fbshipit-source-id: dab3f18f05fcf43fbbc48b589170b1cf367d6a48

packager/src/node-haste/DependencyGraph/ResolutionRequest.js

@@ -49,21 +49,26 @@ export type ModuleMap = {
   ): ?string,
 };
 
-type Packageish = {
+export type Packageish = {
+  isHaste(): boolean,
+  getName(): Promise<string>,
+  path: string,
   redirectRequire(toModuleName: string): string | false,
   getMain(): string,
   +root: string,
 };
 
-type Moduleish = {
+export type Moduleish = {
   +path: string,
+  isHaste(): boolean,
+  getName(): Promise<string>,
   getPackage(): ?Packageish,
   hash(): string,
   readCached(transformOptions: TransformWorkerOptions): CachedReadResult,
   readFresh(transformOptions: TransformWorkerOptions): Promise<ReadResult>,
 };
 
-type ModuleishCache<TModule, TPackage> = {
+export type ModuleishCache<TModule, TPackage> = {
   getPackage(
     name: string,
     platform?: string,