02d1bcc047
Summary: This PR fixes a bug in `deepFreezeAndThrowOnMutationInDev` which did not take into account that objects passed to it may have been created with `Object.create(null)` and thus may not have a prototype. Such objects don't have the methods `hasOwnProperty`, `__defineGetter__`, or `__defineSetter__` on the instance. I ran into an unrecoverable error in React Native when passing this type of object across the bridge because `deepFreezeAndThrowOnMutationInDev` attempts to call `object.hasOwnProperty(key)`, `object.__defineGetter__` and `object__defineSetter__` on objects passed to it. But my object instance does not have these prototype methods. Changes: * Defined `Object.prototype.hasOwnProperty` as a `const` (pattern used elsewhere in React Native) * Modified calls to `object.hasOwnProperty(key)` to use `hasOwnProperty.call(object, key)` (Per ESLint rule [here](https://eslint.org/docs/rules/no-prototype-builtins)) * Modified calls to deprecated methods `object.__defineGetter__` and `object.__defineSetter__` to instead use `Object.defineProperty` to define get and set methods on the object. (Per guidance on [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__)) * Added a new test to `deepFreezeAndThrowOnMutationInDev-test` to verify the fix. I tried to create a reproducible example to post to Snack by passing prototype-less objects to a `Text` component, in various ways, but they appear to be converted to plain objects before crossing the bridge and therefore they do not throw an error. However, I was able to create a new test to reproduce the issue. I added the following test to `deepFreezeAndThrowOnMutationInDev-test`: ```JavaScript it('should not throw on object without prototype', () => { __DEV__ = true; var o = Object.create(null); o.key = 'Value'; expect(() => deepFreezeAndThrowOnMutationInDev(o)).not.toThrow(); }); ``` The changes in this PR include this new test. ESLint test produced no change in Error count (3) or Warnings (671) N/A Other areas with _possibly_ the same issue: |
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| .. | ||
| MatrixMath-test.js | ||
| Platform-test.js | ||
| SceneTracker-test.js | ||
| buildStyleInterpolator-test.js | ||
| deepFreezeAndThrowOnMutationInDev-test.js | ||
| groupByEveryN-test.js | ||
| mapWithSeparator-test.js | ||
| truncate-test.js | ||