59976680df
* Extract for-of iterator handling to a helper Dis greatly recudes the code size when for-of is used multiple times across the codebase. Also, makes it easier to read what's happening in a compiled loop. * Unify spec and loose code * Legacy implementation fallback * Update tmp var name * Updates from review and after rebase
36 lines
645 B
JavaScript
36 lines
645 B
JavaScript
let done = false, value = 0;
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// jest.fn isn't available in exec tests
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function fn(impl = () => {}) {
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function f() {
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f.calls++;
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return impl();
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}
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f.calls = 0;
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return f;
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}
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const iterator = {
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next: fn(() => ({ done, value })),
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throw: fn(),
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return: fn(() => { throw {} }),
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};
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const obj = {
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[Symbol.iterator]: fn(() => iterator),
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};
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const err = new Error();
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expect(() => {
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for (const x of obj) {
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value++;
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if (value == 2) throw err;
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}
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}).toThrow(err);
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expect(obj[Symbol.iterator].calls).toBe(1);
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expect(iterator.next.calls).toBe(2);
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expect(iterator.throw.calls).toBe(0);
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expect(iterator.return.calls).toBe(1);
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