[Fix] fix crash when a custom propType return lacks .data; call hasOwnProperty properly

Fixes #369

Author: ljharb

__tests__/PropTypesDevelopmentReact15.js

@@ -1385,6 +1385,37 @@ describe('PropTypesDevelopmentReact15', () => {
       );
       expectWarningInDevelopment(PropTypes.element, <div />);
     });
+
+    it('works with oneOfType', () => {
+      typeCheckPass(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: 42 }
+      );
+      typeCheckPass(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: '42' }
+      );
+      typeCheckFail(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: 42, bar: 'what is 6 * 7' },
+        `Warning: Failed prop type: Invalid prop \`testProp\` key \`bar\` supplied to \`testComponent\`.
+Bad object: {
+  "foo": 42,
+  "bar": "what is 6 * 7"
+}
+Valid keys: [
+  "foo"
+]`
+      );
+    });
+
+    it('works with a custom propType', () => {
+      typeCheckFail(
+        PropTypes.oneOfType([() => new Error('hi')]),
+        {},
+        'Warning: Failed prop type: Invalid prop `testProp` supplied to `testComponent`.'
+      )
+    });
   });
 
   describe('Symbol Type', () => {

__tests__/PropTypesDevelopmentStandalone-test.js

@@ -1456,6 +1456,37 @@ describe('PropTypesDevelopmentStandalone', () => {
       );
       expectThrowsInDevelopment(PropTypes.element, <div />);
     });
+
+    it('works with oneOfType', () => {
+      typeCheckPass(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: 42 }
+      );
+      typeCheckPass(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: '42' }
+      );
+      typeCheckFail(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: 42, bar: 'what is 6 * 7' },
+        `Warning: Failed prop type: Invalid prop \`testProp\` key \`bar\` supplied to \`testComponent\`.
+Bad object: {
+  "foo": 42,
+  "bar": "what is 6 * 7"
+}
+Valid keys: [
+  "foo"
+]`
+      );
+    });
+
+    it('works with a custom propType', () => {
+      typeCheckFail(
+        PropTypes.oneOfType([() => new Error('hi')]),
+        {},
+        'Warning: Failed prop type: Invalid prop `testProp` supplied to `testComponent`.'
+      )
+    });
   });
 
   describe('Symbol Type', () => {

__tests__/PropTypesProductionReact15-test.js

@@ -1112,6 +1112,28 @@ describe('PropTypesProductionReact15', () => {
       );
       expectNoop(PropTypes.element, <div />);
     });
+
+    it('works with oneOfType', () => {
+      expectNoop(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: 42 }
+      );
+      expectNoop(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: '42' }
+      );
+      expectNoop(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: 42, bar: 'what is 6 * 7' }
+      );
+    });
+
+    it('works with a custom propType', () => {
+      expectNoop(
+        PropTypes.oneOfType([() => new Error('hi')]),
+        {}
+      )
+    });
   });
 
   describe('Symbol Type', () => {

__tests__/PropTypesProductionStandalone-test.js

@@ -326,6 +326,37 @@ describe('PropTypesProductionStandalone', () => {
         PropTypes.exact({key: PropTypes.number}).isRequired,
       );
     });
+
+    it('works with oneOfType', () => {
+      typeCheckPass(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: 42 }
+      );
+      typeCheckPass(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: '42' }
+      );
+      expectThrowsInProduction(
+        PropTypes.exact({ foo: PropTypes.oneOfType([PropTypes.number, PropTypes.string]) }),
+        { foo: 42, bar: 'what is 6 * 7' },
+        `Warning: Failed prop type: Invalid prop \`testProp\` key \`bar\` supplied to \`testComponent\`.
+Bad object: {
+  "foo": 42,
+  "bar": "what is 6 * 7"
+}
+Valid keys: [
+  "foo"
+]`
+      );
+    });
+
+    it('works with a custom propType', () => {
+      expectThrowsInProduction(
+        PropTypes.oneOfType([() => new Error('hi')]),
+        {},
+        'Warning: Failed prop type: Invalid prop `testProp` supplied to `testComponent`.'
+      )
+    });
   });
 
   describe('Symbol Type', () => {

factoryWithTypeCheckers.js

@@ -390,7 +390,7 @@ module.exports = function(isValidElement, throwOnDirectAccess) {
         if (checkerResult == null) {
           return null;
         }
-        if (checkerResult.data.hasOwnProperty('expectedType')) {
+        if (checkerResult.data && has(checkerResult.data, 'expectedType')) {
           expectedTypes.push(checkerResult.data.expectedType);
         }
       }