checkPropTypes: add argument that allows external logging

When specified, the argument `warningLogger` will be called with the
same arguments as `warning`. Instead of logging errors to the fbjs
warning logger, we are able to handle them externally.

Fixes #34

__tests__/PropTypesDevelopmentStandalone-test.js

@@ -146,6 +146,27 @@ describe('PropTypesDevelopmentStandalone', () => {
       expect(console.error.calls.argsFor(0)[0]).toContain('some error');
       expect(returnValue).toBe(undefined);
     });
+
+    it('calls the passed in warning logger', () => {
+      const warningLogger = jest.fn()
+      const propTypes = {
+        foo(props, propName, componentName) {
+          throw new Error('some error');
+        },
+      };
+      const props = {foo: 'foo'};
+      const returnValue = PropTypes.checkPropTypes(
+        propTypes,
+        props,
+        'prop',
+        'testComponent',
+        null,
+        warningLogger,
+      );
+
+      expect(warningLogger).toBeCalledWith(false, 'Failed %s type: %s%s', 'prop', 'some error', '');
+      expect(returnValue).toBe(undefined);
+    });
   });
 
   describe('Primitive Types', () => {

checkPropTypes.js

@@ -27,7 +27,7 @@ if (process.env.NODE_ENV !== 'production') {
  * @param {?Function} getStack Returns the component stack.
  * @private
  */
-function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
+function checkPropTypes(typeSpecs, values, location, componentName, getStack, warningLogger = null) {
   if (process.env.NODE_ENV !== 'production') {
     for (var typeSpecName in typeSpecs) {
       if (typeSpecs.hasOwnProperty(typeSpecName)) {
@@ -51,7 +51,11 @@ function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
 
           var stack = getStack ? getStack() : '';
 
-          warning(false, 'Failed %s type: %s%s', location, error.message, stack != null ? stack : '');
+          if (warningLogger) {
+            warningLogger(false, 'Failed %s type: %s%s', location, error.message, stack != null ? stack : '');
+          } else {
+            warning(false, 'Failed %s type: %s%s', location, error.message, stack != null ? stack : '');
+          }
         }
       }
     }