Daniel Tschinder 47da5cf75a
Correctly transform spreads to use proper concat method (#9108)
* Correctly transform spreads to use proper concat method

* Add tests to ensure array spread clones elements
2018-12-13 23:24:43 -08:00

12 lines
170 B
JavaScript

const arr = [];
arr.concat = () => {
throw new Error('Should not be called');
};
let x;
expect(() => {
x = [...arr];
}).not.toThrow();
expect(x).not.toBe(arr);