Add mocks for packages to resolution responses

Summary:
Right now, a mock called `debug.js` shadows a node module called `debug`. When I made mocking more strict I didn't realize that it didn't include those mocks any more because requiring `debug` would result in a module like `debug/node.js` which doesn't have a mock associated with it. This diff changes it so it looks at the associated `package.json` to match the name up to mocks. This is the least invasive non-breaking change I can make right now. Yes, mocking strategies are basically fucked but I don't want the haste2 integration to have even more breaking changes right now. Consider this code to be temporary, I'll fix this and make the mocking system more sane mid-term.

public

Reviewed By: davidaurelio

Differential Revision: D2889198

fb-gh-sync-id: 58db852ed9acad830538245f7dc347365fe4de38

packager/react-packager/src/DependencyResolver/DependencyGraph/ResolutionRequest.js

@@ -118,14 +118,21 @@ class ResolutionRequest {
           ).then((dependencies) => [depNames, dependencies])
         ).then(([depNames, dependencies]) => {
           if (allMocks) {
-            return mod.getName().then(name => {
-              if (allMocks[name]) {
-                const mockModule =
-                  this._moduleCache.getModule(allMocks[name]);
-                depNames.push(name);
-                dependencies.push(mockModule);
-                mocks[name] = allMocks[name];
-              }
+            const list = [mod.getName()];
+            const pkg = mod.getPackage();
+            if (pkg) {
+              list.push(pkg.getName());
+            }
+            return Promise.all(list).then(names => {
+              names.forEach(name => {
+                if (allMocks[name] && !mocks[name]) {
+                  const mockModule =
+                    this._moduleCache.getModule(allMocks[name]);
+                  depNames.push(name);
+                  dependencies.push(mockModule);
+                  mocks[name] = allMocks[name];
+                }
+              });
               return [depNames, dependencies];
             });
           }
@@ -141,7 +148,7 @@ class ResolutionRequest {
               // module backing them. If a dependency cannot be found but there
               // exists a mock with the desired ID, resolve it and add it as
               // a dependency.
-              if (allMocks && allMocks[name]) {
+              if (allMocks && allMocks[name] && !mocks[name]) {
                 const mockModule = this._moduleCache.getModule(allMocks[name]);
                 mocks[name] = allMocks[name];
                 return filteredPairs.push([name, mockModule]);