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Malte UblandClaude Opus 5.5
cd63b935e0
`id(undefined)` binds T = undefined, which the type mapper answers as VOID (the return convention), so the instance's parameter was refused (SC2001) although a declared `v: undefined` parameter compiles. Instantiated parameters are value positions and now take the unit-only slot, as declared ones do. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
20 lines
635 B
TypeScript
20 lines
635 B
TypeScript
// A generic call with a literal `undefined` argument binds T = undefined;
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// the parameter holds undefined like a declared `v: undefined` parameter.
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function kind<T>(v: T): string {
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return typeof v;
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}
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console.log(kind(undefined), kind(null), kind(1), kind("s"));
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function same<T>(a: T, b: T): boolean {
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return a === b;
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}
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console.log(same(undefined, undefined));
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function wrap<T>(v: T): { v: T } {
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return { v };
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}
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const w = wrap(undefined);
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console.log(JSON.stringify(w), w.v === undefined, "v" in w);
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function describe<T>(label: string, v: T): string {
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return `${label}=${String(v)}`;
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}
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console.log(describe("u", undefined));
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