Deprecate transferPropsTo

src/core/ReactPropTransferer.js

@@ -22,6 +22,9 @@ var emptyFunction = require('emptyFunction');
 var invariant = require('invariant');
 var joinClasses = require('joinClasses');
 var merge = require('merge');
+var warning = require('warning');
+
+var didWarn = false;
 
 /**
  * Creates a transfer strategy that will merge prop values using the supplied
@@ -141,6 +144,17 @@ var ReactPropTransferer = {
         descriptor.type.displayName
       );
 
+      if (__DEV__) {
+        if (!didWarn) {
+          didWarn = true;
+          warning(
+            false,
+            'transferPropsTo is deprecated. ' +
+            'See http://fb.me/react-transferpropsto for more information.'
+          );
+        }
+      }
+
       // Because descriptors are immutable we have to merge into the existing
       // props object rather than clone it.
       transferInto(descriptor.props, this.props);

src/core/__tests__/ReactPropTransferer-test.js

@@ -28,13 +28,18 @@ var TestComponent;
 describe('ReactPropTransferer', function() {
 
   beforeEach(function() {
+    require('mock-modules').dumpCache();
+
     React = require('React');
     ReactTestUtils = require('ReactTestUtils');
     reactComponentExpect = require('reactComponentExpect');
 
+    // We expect to get a warning from transferPropsTo since it's deprecated
+    spyOn(console, 'warn');
+
     TestComponent = React.createClass({
       render: function() {
-        return this.transferPropsTo(
+        var result = this.transferPropsTo(
           <input
             className="textinput"
             style={{display: 'block', color: 'green'}}
@@ -42,6 +47,8 @@ describe('ReactPropTransferer', function() {
             value=""
           />
         );
+        expect(console.warn).toHaveBeenCalled();
+        return result;
       }
     });
   });