Remove react-packager indirection.

Summary:
This moves the `src` directory one level up and removes the `react-packager` folder. Personally, I always disliked this indirection. I'm reorganizing some things in RNP, so this seems to make sense.

Not sure if I forgot to update any paths. Can anyone advice if there are more places that need change?

Reviewed By: jeanlauliac

Differential Revision: D4487867

fbshipit-source-id: d63f9c79d6238300df9632d2e6a4e6a4196d5ccb

packager/src/ModuleGraph/__tests__/ModuleGraph-test.js

@@ -0,0 +1,119 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+'use strict';
+
+jest.disableAutomock();
+
+const ModuleGraph = require('../ModuleGraph');
+const defaults = require('../../../defaults');
+
+const FILE_TYPE = 'module';
+
+describe('build setup', () => {
+  const buildSetup = ModuleGraph.createBuildSetup(graph);
+  const noOptions = {};
+  const noEntryPoints = [];
+
+  it('adds a prelude containing start time and `__DEV__` to the build', done => {
+    buildSetup(noEntryPoints, noOptions, (error, result) => {
+      expect(error).toEqual(null);
+
+      const [prelude] = result.modules;
+      expect(prelude).toEqual({
+        dependencies: [],
+        file: {
+          code: 'var __DEV__=true,__BUNDLE_START_TIME__=Date.now();',
+          path: '',
+          type: 'script',
+        },
+      });
+      done();
+    });
+  });
+
+  it('sets `__DEV__` to false in the prelude if optimization is enabled', done => {
+    buildSetup(noEntryPoints, {optimize: true}, (error, result) => {
+      const [prelude] = result.modules;
+      expect(prelude.file.code)
+        .toEqual('var __DEV__=false,__BUNDLE_START_TIME__=Date.now();');
+      done();
+    });
+  });
+
+  it('places the module system implementation directly after the prelude', done => {
+    buildSetup(noEntryPoints, noOptions, (error, result) => {
+      const [, moduleSystem] = result.modules;
+      expect(moduleSystem).toEqual({
+        dependencies: [],
+        file: {
+          code: '',
+          path: defaults.moduleSystem,
+          type: FILE_TYPE,
+        },
+      });
+      done();
+    });
+  });
+
+  it('places polyfills after the module system', done => {
+    buildSetup(noEntryPoints, noOptions, (error, result) => {
+      const polyfills =
+        Array.from(result.modules).slice(2, 2 + defaults.polyfills.length);
+      expect(polyfills).toEqual(defaults.polyfills.map(moduleFromPath));
+      done();
+    });
+  });
+
+  it('places all modules from `defaults.runBeforeMainModule` after the polyfills', done => {
+    buildSetup(noEntryPoints, noOptions, (error, result) => {
+      const additionalModules =
+        Array.from(result.modules).slice(-defaults.runBeforeMainModule.length);
+      expect(additionalModules)
+        .toEqual(defaults.runBeforeMainModule.map(moduleFromPath));
+      done();
+    });
+  });
+
+  it('places all entry points at the end', done => {
+    const entryPoints = ['a', 'b', 'c'];
+    buildSetup(entryPoints, noOptions, (error, result) => {
+      expect(Array.from(result.modules).slice(-3))
+        .toEqual(entryPoints.map(moduleFromPath));
+      done();
+    });
+  });
+
+  it('concatenates `runBeforeMainModule` and entry points as `entryModules`', done => {
+    const entryPoints = ['a', 'b', 'c'];
+    buildSetup(entryPoints, noOptions, (error, result) => {
+      expect(Array.from(result.entryModules)).toEqual(
+        defaults.runBeforeMainModule.concat(entryPoints).map(moduleFromPath));
+      done();
+    });
+  });
+});
+
+function moduleFromPath(path) {
+  return {
+    dependencies: [],
+    file: {
+      code: '',
+      path,
+      type: FILE_TYPE,
+    },
+  };
+}
+
+function graph(entryPoints, platform, options, callback) {
+  const modules = Array.from(entryPoints, moduleFromPath);
+  callback(null, {
+    entryModules: modules,
+    modules,
+  });
+}