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/output/util.js

@@ -0,0 +1,85 @@
+/**
+ * Copyright (c) 2016-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.
+ *
+ * @flow
+ */
+'use strict';
+
+import type {IdForPathFn, Module} from '../types.flow';
+
+// Transformed modules have the form
+//   __d(function(require, module, global, exports, dependencyMap) {
+//       /* code */
+//   });
+//
+// This function adds the numeric module ID, and an array with dependencies of
+// the dependencies of the module before the closing parenthesis.
+exports.addModuleIdsToModuleWrapper = (
+  module: Module,
+  idForPath: {path: string} => number,
+): string => {
+  const {dependencies, file} = module;
+  const {code} = file;
+  const index = code.lastIndexOf(')');
+
+  // calling `idForPath` on the module itself first gives us a lower module id
+  // for the file itself than for its dependencies. That reflects their order
+  // in the bundle.
+  const fileId = idForPath(file);
+
+  // This code runs for both development and production builds, after
+  // minification. That's why we leave out all spaces.
+  const depencyIds =
+    dependencies.length ? `,[${dependencies.map(idForPath).join(',')}]` : '';
+  return (
+    code.slice(0, index) +
+    `,${fileId}` +
+    depencyIds +
+    code.slice(index)
+  );
+};
+
+// Creates an idempotent function that returns numeric IDs for objects based
+// on their `path` property.
+exports.createIdForPathFn = (): ({path: string} => number) => {
+  const seen = new Map();
+  let next = 0;
+  return ({path}) => {
+    let id = seen.get(path);
+    if (id == null) {
+      id = next++;
+      seen.set(path, id);
+    }
+    return id;
+  };
+};
+
+// creates a series of virtual modules with require calls to the passed-in
+// modules.
+exports.requireCallsTo = function* (
+  modules: Iterable<Module>,
+  idForPath: IdForPathFn,
+): Iterable<Module> {
+  for (const module of modules) {
+    yield virtualModule(`require(${idForPath(module.file)});`);
+  }
+};
+
+// creates a virtual module (i.e. not corresponding to a file on disk)
+// with the given source code.
+exports.virtualModule = virtualModule;
+function virtualModule(code: string) {
+  return {
+    dependencies: [],
+    file: {
+      code,
+      path: '',
+      type: 'script',
+    }
+  };
+}