Rename TYPE_SYMBOL to REACT_ELEMENT_TYPE

See D2454031 for context.

src/isomorphic/classic/element/ReactElement.js

@@ -17,7 +17,7 @@ var assign = require('Object.assign');
 
 // The Symbol used to tag the ReactElement type. If there is no native Symbol
 // nor polyfill, then a plain number is used for performance.
-var TYPE_SYMBOL =
+var REACT_ELEMENT_TYPE =
   (typeof Symbol === 'function' && Symbol.for && Symbol.for('react.element')) ||
   0xeac7;
 
@@ -59,7 +59,7 @@ if (__DEV__) {
 var ReactElement = function(type, key, ref, self, source, owner, props) {
   var element = {
     // This tag allow us to uniquely identify this as a React Element
-    $$typeof: TYPE_SYMBOL,
+    $$typeof: REACT_ELEMENT_TYPE,
 
     // Built-in properties that belong on the element
     type: type,
@@ -289,7 +289,7 @@ ReactElement.isValidElement = function(object) {
   return (
     typeof object === 'object' &&
     object !== null &&
-    object.$$typeof === TYPE_SYMBOL
+    object.$$typeof === REACT_ELEMENT_TYPE
   );
 };
 

src/isomorphic/classic/element/__tests__/ReactElement-test.js

@@ -327,14 +327,14 @@ describe('ReactElement', function() {
     // Rudimentary polyfill
     // Once all jest engines support Symbols natively we can swap this to test
     // WITH native Symbols by default.
-    var TYPE_SYMBOL = function() {}; // fake Symbol
+    var REACT_ELEMENT_TYPE = function() {}; // fake Symbol
     var OTHER_SYMBOL = function() {}; // another fake Symbol
     global.Symbol = function(name) {
       return OTHER_SYMBOL;
     };
     global.Symbol.for = function(key) {
       if (key === 'react.element') {
-        return TYPE_SYMBOL;
+        return REACT_ELEMENT_TYPE;
       }
       return OTHER_SYMBOL;
     };