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41 lines
1.1 KiB
JavaScript
41 lines
1.1 KiB
JavaScript
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test("parse optional-chaining", () => {
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expect(`a?.b`).toEval();
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expect(`a?.4:.5`).toEval();
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expect(`a?.[b]`).toEval();
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expect(`a?.b[b]`).toEval();
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expect(`a?.b(c)`).toEval();
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expect(`a?.b?.(c, d)`).toEval();
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expect(`a?.b?.()`).toEval();
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expect("a?.b``").not.toEval();
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expect("a?.b?.``").not.toEval();
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expect("new Foo?.bar").not.toEval();
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expect("new (Foo?.bar)").toEval();
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// FIXME: This should pass.
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// expect("(new Foo)?.bar").toEval();
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});
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test("evaluate optional-chaining", () => {
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for (let nullishObject of [null, undefined]) {
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expect((() => nullishObject?.b)()).toBeUndefined();
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}
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expect(
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(() => {
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let a = {};
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return a?.foo?.bar?.baz;
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})()
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).toBeUndefined();
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expect(
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(() => {
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let a = { foo: { bar: () => 42 } };
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return `${a?.foo?.bar?.()}-${a?.foo?.baz?.()}`;
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})()
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).toBe("42-undefined");
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expect(() => {
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let a = { foo: { bar: () => 42 } };
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return a.foo?.baz.nonExistentProperty;
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}).toThrow();
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});
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