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Summary: This diff removes the `sinon` dependency from `metro` and `react-native-github`. It was only used in a handful of tests and having to learn and remember another mocking API just for these cases was not worth it IMO. While doing the migration, most of the things that `sinon` provides can be done with `jest` in a very similar (and user friendly) way. I've found, though, two small things that are more user friendly with `sinon`. I'm documenting them here because it may be worth adding them to jest: With `sinon`: ``` stub.throws(new Error('foo')); ``` With `jest`: ``` mock.mockImplementation(() => { throw new Error('foo'); }); ``` Taking into account that `jest` has a `mockRejectedValue` method for mocks (to return a rejected promise) I don't see any reason why it does not have a `mockThrowError` method. With `sinon`: ``` expect(mock1.calledBefore(mock2)).toBeTruthy(); ``` With `jest`: ``` expect(mock1.mock.invocationCallOrder[0]).toBeLessThan( mock2.mock.invocationCallOrder[0], ); ``` There's a community matcher that adds this matcher in `jest-extended`: https://github.com/jest-community/jest-extended#tohavebeencalledbefore, but we're not using `jest-extended` in `xplat/js`. Reviewed By: jeanlauliac Differential Revision: D10238331 fbshipit-source-id: 5441125b69596ad85bf8f56d203cfd20759bc358