48 lines
893 B
TypeScript
48 lines
893 B
TypeScript
// @strict: true
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// @declaration: true
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type T1 = [number, string, boolean];
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type T2 = [number, string, boolean?];
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type T3 = [number, string?, boolean?];
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type T4 = [number?, string?, boolean?];
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type L1 = T1["length"];
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type L2 = T2["length"];
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type L3 = T3["length"];
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type L4 = T4["length"];
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type T5 = [number, string?, boolean]; // Error
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function f1(t1: T1, t2: T2, t3: T3, t4: T4) {
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t1 = t1;
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t1 = t2; // Error
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t1 = t3; // Error
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t1 = t4; // Error
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t2 = t1;
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t2 = t2;
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t2 = t3; // Error
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t2 = t4; // Error
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t3 = t1;
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t3 = t2;
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t3 = t3;
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t3 = t4; // Error
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t4 = t1;
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t4 = t2;
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t4 = t3;
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t4 = t4;
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}
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let t2: T2;
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let t3: T3;
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let t4: T4;
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t2 = [42, "hello"];
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t3 = [42, "hello"];
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t3 = [42,,true]
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t3 = [42];
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t4 = [42, "hello"];
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t4 = [42,,true];
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t4 = [,"hello", true];
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t4 = [,,true];
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t4 = [];
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