cc1c2ab6b2
skipping narrowing if the old algorithm produces a type to which the assigned type is not assignable. This also means we'll no longer narrow for erroneous assignments where the assigned type is not assignable to the declared type. This is the reason for the numericLiteralTypes3 baseline change. Fixes #26405.
35 lines
483 B
TypeScript
35 lines
483 B
TypeScript
let x: string | number | boolean | RegExp;
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x = "";
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x; // string
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[x] = [true];
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x; // boolean
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[x = ""] = [1];
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x; // string | number
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({x} = {x: true});
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x; // boolean
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({y: x} = {y: 1});
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x; // number
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({x = ""} = {x: true});
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x; // string | boolean
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({y: x = /a/} = {y: 1});
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x; // number | RegExp
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let a: string[];
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for (x of a) {
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x; // string
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}
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// Repro from #26405
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type AOrArrA<T> = T | T[];
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const arr: AOrArrA<{x?: "ok"}> = [{ x: "ok" }]; // weak type
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arr.push({ x: "ok" });
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