Add new primitive PropType Symbol

package.json

@@ -29,9 +29,11 @@
     "browserify": "^12.0.1",
     "bundle-collapser": "^1.1.1",
     "coffee-script": "^1.8.0",
+    "core-js": "^2.2.1",
     "coveralls": "^2.11.6",
     "del": "^2.0.2",
     "derequire": "^2.0.3",
+    "es6-symbol": "^3.0.2",
     "eslint": "1.10.3",
     "eslint-plugin-react": "4.1.0",
     "eslint-plugin-react-internal": "file:eslint-rules",

src/isomorphic/classic/types/ReactPropTypes.js

@@ -73,6 +73,7 @@ var ReactPropTypes = {
   number: createPrimitiveTypeChecker('number'),
   object: createPrimitiveTypeChecker('object'),
   string: createPrimitiveTypeChecker('string'),
+  symbol: createPrimitiveTypeChecker('symbol'),
 
   any: createAnyTypeChecker(),
   arrayOf: createArrayOfTypeChecker,
@@ -406,6 +407,25 @@ function isNode(propValue) {
   }
 }
 
+function isSymbol(propType, propValue) {
+  // Native Symbol.
+  if (propType === 'symbol') {
+    return true;
+  }
+
+  // 19.4.3.5 Symbol.prototype[@@toStringTag] === 'Symbol'
+  if (propValue['@@toStringTag'] === 'Symbol') {
+    return true;
+  }
+
+  // Fallback for non-spec compliant Symbols which are polyfilled.
+  if (typeof Symbol === 'function' && propValue instanceof Symbol) {
+    return true;
+  }
+
+  return false;
+}
+
 // Equivalent of `typeof` but with special handling for array and regexp.
 function getPropType(propValue) {
   var propType = typeof propValue;
@@ -418,6 +438,9 @@ function getPropType(propValue) {
     // passes PropTypes.object.
     return 'object';
   }
+  if (isSymbol(propType, propValue)) {
+    return 'symbol';
+  }
   return propType;
 }
 

src/isomorphic/classic/types/__tests__/ReactPropTypes-test.js

@@ -80,6 +80,12 @@ describe('ReactPropTypes', function() {
         'Invalid prop `testProp` of type `object` supplied to ' +
         '`testComponent`, expected `string`.'
       );
+      typeCheckFail(
+        PropTypes.string,
+        Symbol(),
+        'Invalid prop `testProp` of type `symbol` supplied to ' +
+        '`testComponent`, expected `string`.'
+      );
     });
 
     it('should fail date and regexp correctly', function() {
@@ -106,6 +112,7 @@ describe('ReactPropTypes', function() {
       typeCheckPass(PropTypes.object, {});
       typeCheckPass(PropTypes.object, new Date());
       typeCheckPass(PropTypes.object, /please/);
+      typeCheckPass(PropTypes.symbol, Symbol());
     });
 
     it('should be implicitly optional and not warn without values', function() {
@@ -124,6 +131,7 @@ describe('ReactPropTypes', function() {
       typeCheckPass(PropTypes.any, 0);
       typeCheckPass(PropTypes.any, 'str');
       typeCheckPass(PropTypes.any, []);
+      typeCheckPass(PropTypes.any, Symbol());
     });
 
     it('should be implicitly optional and not warn without values', function() {
@@ -150,6 +158,7 @@ describe('ReactPropTypes', function() {
       typeCheckPass(PropTypes.arrayOf(PropTypes.number), [1, 2, 3]);
       typeCheckPass(PropTypes.arrayOf(PropTypes.string), ['a', 'b', 'c']);
       typeCheckPass(PropTypes.arrayOf(PropTypes.oneOf(['a', 'b'])), ['a', 'b']);
+      typeCheckPass(PropTypes.arrayOf(PropTypes.symbol), [Symbol(), Symbol()]);
     });
 
     it('should support arrayOf with complex types', function() {
@@ -487,6 +496,10 @@ describe('ReactPropTypes', function() {
         PropTypes.objectOf(PropTypes.oneOf(['a', 'b'])),
         {a: 'a', b: 'b'}
       );
+      typeCheckPass(
+        PropTypes.objectOf(PropTypes.symbol),
+        {a: Symbol(), b: Symbol(), c: Symbol()}
+      );
     });
 
     it('should support objectOf with complex types', function() {
@@ -542,6 +555,12 @@ describe('ReactPropTypes', function() {
         'Invalid prop `testProp` of type `string` supplied to ' +
         '`testComponent`, expected an object.'
       );
+      typeCheckFail(
+        PropTypes.objectOf(PropTypes.symbol),
+        Symbol(),
+        'Invalid prop `testProp` of type `symbol` supplied to ' +
+        '`testComponent`, expected an object.'
+      );
     });
 
     it('should not warn when passing an empty object', function() {
@@ -779,6 +798,36 @@ describe('ReactPropTypes', function() {
     });
   });
 
+  describe('Symbol Type', function() {
+    it('should warn for non-symbol', function() {
+      typeCheckFail(
+        PropTypes.symbol,
+        'hello',
+        'Invalid prop `testProp` of type `string` supplied to ' +
+        '`testComponent`, expected `symbol`.'
+      );
+      typeCheckFail(
+        PropTypes.symbol,
+        function() { },
+        'Invalid prop `testProp` of type `function` supplied to ' +
+        '`testComponent`, expected `symbol`.'
+      );
+      typeCheckFail(
+        PropTypes.symbol,
+        {
+          '@@toStringTag': 'Katana',
+        },
+        'Invalid prop `testProp` of type `object` supplied to ' +
+        '`testComponent`, expected `symbol`.'
+      );
+    });
+
+    it('should not warn for a polyfilled Symbol', function() {
+      var CoreSymbol = require('core-js/library/es6/symbol');
+      typeCheckPass(PropTypes.symbol, CoreSymbol('core-js'));
+    });
+  });
+
   describe('Custom validator', function() {
     beforeEach(function() {
       jest.resetModuleRegistry();