65 lines
2 KiB
TypeScript
65 lines
2 KiB
TypeScript
// @strict: true
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type T1 = [string, number];
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type T2 = [boolean] | [string, number];
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type T3 = [string, ...number[]];
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type T4 = [boolean] | [string, ...number[]];
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type T10 = T1[0]; // string
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type T11 = T1[1]; // number
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type T12 = T1[2]; // undefined
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type T1N = T1[number]; // string | number
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type T20 = T2[0]; // string | boolean
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type T21 = T2[1]; // number | undefined
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type T22 = T2[2]; // undefined
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type T2N = T2[number]; // string | number | boolean
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type T30 = T3[0]; // string
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type T31 = T3[1]; // number
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type T32 = T3[2]; // number
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type T3N = T3[number]; // string | number
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type T40 = T4[0]; // string | boolean
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type T41 = T4[1]; // number | undefined
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type T42 = T4[2]; // number | undefined
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type T4N = T4[number]; // string | number | boolean
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function f1(t1: T1, t2: T2, t3: T3, t4: T4, x: number) {
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let [d10, d11, d12] = t1; // string, number
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let [d20, d21, d22] = t2; // string | boolean, number | undefined
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let [d30, d31, d32] = t3; // string, number, number
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let [d40, d41, d42] = t4; // string | boolean, number | undefined, number | undefined
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[d10, d11, d12] = t1;
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[d20, d21, d22] = t2;
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[d30, d31, d32] = t3;
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[d40, d41, d42] = t4;
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let t10 = t1[0]; // string
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let t11 = t1[1]; // number
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let t12 = t1[2]; // undefined
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let t1x = t1[x]; // string | number
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let t20 = t2[0]; // string | boolean
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let t21 = t2[1]; // number | undefined
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let t22 = t2[2]; // undefined
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let t2x = t2[x]; // string | number | boolean
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let t30 = t3[0]; // string
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let t31 = t3[1]; // number
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let t32 = t3[2]; // number
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let t3x = t3[x]; // string | number
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let t40 = t4[0]; // string | boolean
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let t41 = t4[1]; // number | undefined
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let t42 = t4[2]; // number | undefined
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let t4x = t4[x]; // string | number | boolean
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t1[1] = 42;
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t2[1] = 42;
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t3[1] = 42;
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t4[1] = 42;
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}
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// Repro from #27543
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type Unioned = [string] | [string, number];
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const ex: Unioned = ["hi"] as Unioned;
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const [x, y] = ex;
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