Move component base classes into a single file (facebook#8918)

src/isomorphic/React.js

@@ -11,6 +11,7 @@
 
 'use strict';
 
+var ReactBaseClasses = require('ReactBaseClasses');
 var ReactChildren = require('ReactChildren');
 var ReactComponent = require('ReactComponent');
 var ReactPureComponent = require('ReactPureComponent');
@@ -81,8 +82,8 @@ var React = {
     only: onlyChild,
   },
 
-  Component: ReactComponent,
-  PureComponent: ReactPureComponent,
+  Component: ReactBaseClasses.Component,
+  PureComponent: ReactBaseClasses.PureComponent,
 
   createElement: createElement,
   cloneElement: cloneElement,

src/isomorphic/modern/class/ReactComponent.js → src/isomorphic/modern/class/ReactBaseClasses.js

@@ -6,7 +6,7 @@
  * 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 ReactComponent
+ * @providesModule ReactBaseClasses
  */
 
 'use strict';
@@ -132,4 +132,28 @@ if (__DEV__) {
   }
 }
 
-module.exports = ReactComponent;
+/**
+ * Base class helpers for the updating state of a component.
+ */
+function ReactPureComponent(props, context, updater) {
+  // Duplicated from ReactComponent.
+  this.props = props;
+  this.context = context;
+  this.refs = emptyObject;
+  // We initialize the default updater but the real one gets injected by the
+  // renderer.
+  this.updater = updater || ReactNoopUpdateQueue;
+}
+
+function ComponentDummy() {}
+ComponentDummy.prototype = ReactComponent.prototype;
+ReactPureComponent.prototype = new ComponentDummy();
+ReactPureComponent.prototype.constructor = ReactPureComponent;
+// Avoid an extra prototype jump for these methods.
+Object.assign(ReactPureComponent.prototype, ReactComponent.prototype);
+ReactPureComponent.prototype.isPureReactComponent = true;
+
+module.exports = {
+  Component: ReactComponent,
+  PureComponent: ReactPureComponent,
+};