43 lines
989 B
TypeScript
43 lines
989 B
TypeScript
// @strict: true
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function f1(obj: { a?: string }) {
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if (obj.a) {
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obj = {};
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let a1 = obj["a"]; // string | undefined
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let a2 = obj.a; // string | undefined
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}
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}
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function f2(obj: [number, string] | null[]) {
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let a0 = obj[0]; // number | null
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let a1 = obj[1]; // string | null
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let [b0, b1] = obj;
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([a0, a1] = obj);
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if (obj[0] && obj[1]) {
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let c0 = obj[0]; // number
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let c1 = obj[1]; // string
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let [d0, d1] = obj;
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([c0, c1] = obj);
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}
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}
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function f3(obj: { a?: number, b?: string }) {
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if (obj.a && obj.b) {
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let { a, b } = obj; // number, string
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({ a, b } = obj);
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}
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}
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function f4() {
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let x: boolean;
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({ x } = 0); // Error
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({ ["x"]: x } = 0); // Error
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({ ["x" + ""]: x } = 0); // Errpr
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}
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// Repro from #31770
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type KeyValue = [string, string?];
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let [key, value]: KeyValue = ["foo"];
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value.toUpperCase(); // Error
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