Add a PropTypes for React elementType (ie. MyComponent)

README.md

@@ -78,9 +78,12 @@ MyComponent.propTypes = {
   // (or fragment) containing these types.
   optionalNode: PropTypes.node,
 
-  // A React element.
+  // A React element (ie. <MyComponent />).
   optionalElement: PropTypes.element,
 
+  // A React element type (ie. MyComponent).
+  optionalElementType: PropTypes.elementType,
+
   // You can also declare that a prop is an instance of a class. This uses
   // JS's instanceof operator.
   optionalMessage: PropTypes.instanceOf(Message),

__tests__/PropTypesDevelopmentStandalone-test.js

@@ -18,6 +18,7 @@ function resetWarningCache() {
   React = require('react');
   PropTypes = require('../index');
 }
+resetWarningCache();
 
 function getPropTypeWarningMessage(propTypes, object, componentName) {
   if (!console.error.calls) {
@@ -555,6 +556,77 @@ describe('PropTypesDevelopmentStandalone', () => {
     });
   });
 
+  describe('ElementType Types', () => {
+    it('should support native component', () => {
+      typeCheckPass(PropTypes.elementType, 'div');
+    });
+
+    it('should support stateless component', () => {
+      var MyComponent = () => <div />;
+      typeCheckPass(PropTypes.elementType, MyComponent);
+    });
+
+    it('should support stateful component', () => {
+      class MyComponent extends React.Component {
+        render() {
+          return <div />;
+        }
+      }
+      typeCheckPass(PropTypes.elementType, MyComponent);
+    });
+
+    (React.forwardRef ? it : it.skip)('should support forwardRef component', () => {
+      const MyForwardRef = React.forwardRef((props, ref) => <div ref={ref} />);
+      typeCheckPass(PropTypes.elementType, MyForwardRef);
+    });
+
+    (React.createContext ? it : it.skip)('should support context provider component', () => {
+      const MyContext = React.createContext('test');
+      typeCheckPass(PropTypes.elementType, MyContext.Provider);
+    });
+
+    (React.createContext ? it : it.skip)('should support context consumer component', () => {
+      const MyContext = React.createContext('test');
+      typeCheckPass(PropTypes.elementType, MyContext.Consumer);
+    });
+
+    it('should warn for invalid types', () => {
+      typeCheckFail(
+        PropTypes.elementType,
+        true,
+        'Invalid prop `testProp` of type `boolean` supplied to ' +
+          '`testComponent`, expected a single ReactElement type.',
+      );
+
+      typeCheckFail(
+        PropTypes.elementType,
+        {},
+        'Invalid prop `testProp` of type `object` supplied to ' +
+          '`testComponent`, expected a single ReactElement type.',
+      );
+
+      typeCheckFail(
+        PropTypes.elementType,
+        [],
+        'Invalid prop `testProp` of type `array` supplied to ' +
+          '`testComponent`, expected a single ReactElement type.',
+      );
+
+      it('should warn for missing required values', () => {
+        typeCheckFailRequiredValues(PropTypes.elementType.isRequired);
+      });
+    });
+
+    it('should warn for React element', () => {
+      typeCheckFail(
+        PropTypes.elementType,
+        <div />,
+        'Invalid prop `testProp` of type `object` supplied to ' +
+          '`testComponent`, expected a single ReactElement type.',
+      );
+    });
+  });
+
   describe('Instance Types', () => {
     it('should warn for invalid instances', () => {
       function Person() {}

__tests__/PropTypesProductionStandalone-test.js

@@ -162,6 +162,13 @@ describe('PropTypesProductionStandalone', function() {
     });
   });
 
+  describe('React ElementType Type', function() {
+    it('shoud be a no-op', function() {
+      expectThrowsInProduction(PropTypes.elementType.isRequired, false);
+      expectThrowsInProduction(PropTypes.elementType.isRequired, {});
+    });
+  });
+
   describe('ObjectOf Type', function() {
     it('should be a no-op', function() {
       expectThrowsInProduction(PropTypes.objectOf({foo: PropTypes.string}), {

factoryWithThrowingShims.js

@@ -45,6 +45,7 @@ module.exports = function() {
     any: shim,
     arrayOf: getShim,
     element: shim,
+    elementType: shim,
     instanceOf: getShim,
     node: shim,
     objectOf: getShim,

factoryWithTypeCheckers.js

@@ -7,6 +7,7 @@
 
 'use strict';
 
+var ReactIs = require('react-is');
 var assign = require('object-assign');
 
 var ReactPropTypesSecret = require('./lib/ReactPropTypesSecret');
@@ -123,6 +124,7 @@ module.exports = function(isValidElement, throwOnDirectAccess) {
     any: createAnyTypeChecker(),
     arrayOf: createArrayOfTypeChecker,
     element: createElementTypeChecker(),
+    elementType: createElementTypeTypeChecker(),
     instanceOf: createInstanceTypeChecker,
     node: createNodeChecker(),
     objectOf: createObjectOfTypeChecker,
@@ -276,6 +278,18 @@ module.exports = function(isValidElement, throwOnDirectAccess) {
     return createChainableTypeChecker(validate);
   }
 
+  function createElementTypeTypeChecker() {
+    function validate(props, propName, componentName, location, propFullName) {
+      var propValue = props[propName];
+      if (!ReactIs.isValidElementType(propValue)) {
+        var propType = getPropType(propValue);
+        return new PropTypeError('Invalid ' + location + ' `' + propFullName + '` of type ' + ('`' + propType + '` supplied to `' + componentName + '`, expected a single ReactElement type.'));
+      }
+      return null;
+    }
+    return createChainableTypeChecker(validate);
+  }
+
   function createInstanceTypeChecker(expectedClass) {
     function validate(props, propName, componentName, location, propFullName) {
       if (!(props[propName] instanceof expectedClass)) {

index.js

@@ -6,21 +6,12 @@
  */
 
 if (process.env.NODE_ENV !== 'production') {
-  var REACT_ELEMENT_TYPE = (typeof Symbol === 'function' &&
-    Symbol.for &&
-    Symbol.for('react.element')) ||
-    0xeac7;
-
-  var isValidElement = function(object) {
-    return typeof object === 'object' &&
-      object !== null &&
-      object.$$typeof === REACT_ELEMENT_TYPE;
-  };
+  var ReactIs = require('react-is');
 
   // By explicitly using `prop-types` you are opting into new development behavior.
   // http://fb.me/prop-types-in-prod
   var throwOnDirectAccess = true;
-  module.exports = require('./factoryWithTypeCheckers')(isValidElement, throwOnDirectAccess);
+  module.exports = require('./factoryWithTypeCheckers')(ReactIs.isElement, throwOnDirectAccess);
 } else {
   // By explicitly using `prop-types` you are opting into new production behavior.
   // http://fb.me/prop-types-in-prod

package.json

@@ -25,7 +25,8 @@
   },
   "homepage": "https://facebook.github.io/react/",
   "dependencies": {
-    "object-assign": "^4.1.1"
+    "object-assign": "^4.1.1",
+    "react-is": "^16.8.1"
   },
   "scripts": {
     "test": "jest",

yarn.lock

@@ -2356,6 +2356,11 @@ randombytes@^2.0.0, randombytes@^2.0.1:
   dependencies:
     safe-buffer "^5.1.0"
 
+react-is@^16.8.1:
+  version "16.8.1"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.8.1.tgz#a80141e246eb894824fb4f2901c0c50ef31d4cdb"
+  integrity sha512-ioMCzVDWvCvKD8eeT+iukyWrBGrA3DiFYkXfBsVYIRdaREZuBjENG+KjrikavCLasozqRWTwFUagU/O4vPpRMA==
+
 react@^15.5.1:
   version "15.6.2"
   resolved "https://registry.yarnpkg.com/react/-/react-15.6.2.tgz#dba0434ab439cfe82f108f0f511663908179aa72"