React New Reconciler

This is an outline for the new reconciler infrastructure.

I created a noop renderer to have something to get started from.

I split the reconciler folder into old and new, as well as shared.
I put shouldUpdateReactComponent in shared as an example of a
utility that can easily be shared between both. I plan on breaking
out more utilities like these.

src/renderers/noop/ReactNoop.js

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+/**
+ * Copyright 2013-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.
+ *
+ * @providesModule ReactNoop
+ * @flow
+ */
+
+/**
+ * This is a renderer of React that doesn't have a render target output.
+ * It is useful to demonstrate the internals of the reconciler in isolation
+ * and for testing semantics of reconciliation separate from the host
+ * environment.
+ */
+
+'use strict';
+
+var ReactNewReconciler = require('ReactNewReconciler');
+
+var NoopRenderer = ReactNewReconciler({
+
+  createHostInstance() {
+
+  }
+
+});
+
+var ReactNoop = {
+
+  render(element : ReactElement) {
+
+  }
+
+};
+
+module.exports = ReactNoop;

src/renderers/shared/reconciler/new/ReactFiber.js

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+/**
+ * Copyright 2013-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.
+ *
+ * @providesModule ReactFiber
+ * @flow
+ */
+
+'use strict';
+
+type EffectTag = number;
+
+export type Fiber = {
+
+  handlerTag: EffectTag
+
+};
+
+module.exports = function() : Fiber {
+  return {
+
+    handlerTag: 0
+
+  };
+}

src/renderers/shared/reconciler/new/ReactNewReconciler.js

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+/**
+ * Copyright 2013-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.
+ *
+ * @providesModule ReactNewReconciler
+ * @flow
+ */
+
+'use strict';
+
+type ReactHostElement<T, P> = {
+  type: T,
+  props: P
+};
+
+export type HostConfig<T, P, I> = {
+
+  createHostInstance(element : ReactHostElement) : I
+
+};
+
+export type Reconciler = {
+  mountNewRoot(element : ReactElement) : void;
+};
+
+module.exports = function<T, P, I>(config : HostConfig<T, P, I>) : Reconciler {
+  return {
+
+    mountNewRoot() {
+
+    }
+
+  };
+}