Add proper object creator

Author: mattphillips

src/utils/index.js

@@ -1,3 +1,4 @@
 export const isDate = d => d instanceof Date;
 export const isEmpty = o => Object.keys(o).length === 0;
 export const isObject = o => o != null && typeof o === 'object';
+export const properObject = o => isObject(o) && !o.hasOwnProperty ? { ...o } : o;

src/utils/index.test.js

@@ -1,6 +1,6 @@
 import forEach from 'jest-each';
 
-import { isDate, isEmpty, isObject } from './';
+import { isDate, isEmpty, isObject, properObject } from './';
 
 describe('utils', () => {
 
@@ -72,4 +72,27 @@ describe('utils', () => {
       expect(isObject(value)).toBe(false);
     });
   });
+
+  describe('.properObject', () => {
+    it('returns given object when object has keys and hasOwnProperty function', () => {
+      const o = { a: 1 };
+      const a = [1];
+      expect(properObject(o)).toBe(o);
+      expect(properObject(a)).toBe(a);
+    });
+
+    it('returns given value when value is not an object', () => {
+      const o = 'hello';
+      expect(properObject(o)).toBe(o);
+    });
+
+    it('returns object that has given keys and hasOwnProperty function when given object is created from a null', () => {
+      const o = Object.create(null);
+      o.a = 1;
+      const actual = properObject(o);
+      expect(actual).toEqual({ a: 1 });
+      expect(typeof actual.hasOwnProperty === 'function').toBe(true);
+      expect(actual).not.toBe(o);
+    });
+  });
 });