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Chris Tate
eccb061a12
The capture into an index-signature record consults a record's kept source
view only when some checked conversion in the program can keep one. That
scan accepted a closed record target and looked through union arms,
promises and arrays, but stopped at an index-signature record or a record
whose fields hold closed records. A conversion into
`Record<string, { x: string }>` keeps each value's undeclared keys, so a
program whose only such conversion had that shape dropped them in the
capture. The scan now looks through record fields and index-signature
values too, memoizing records by shape as it does unions.
20 lines
887 B
TypeScript
20 lines
887 B
TypeScript
// A checked conversion into an index-signature record whose values are
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// closed records keeps each value's undeclared source keys, so converting
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// such a value into an index-signature record later copies them. This
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// program has no checked conversion into a closed record itself, so the
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// capture learns that kept sources are possible from the index signature's
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// values. Node prints "extra,x".
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type H = Record<string, string | null>;
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interface T {
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transformHeaders?: (h: H) => H | Promise<H>;
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}
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const parsed: Record<string, { x: string }> = JSON.parse('{"p":{"x":"1","extra":"e"}}');
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async function viaArrow<O extends T>(o: O | undefined): Promise<H> {
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let h: H = { accept: "a" };
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if (o?.transformHeaders) h = await o.transformHeaders(h);
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return h;
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}
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viaArrow({ transformHeaders: async (h) => parsed["p"]! }).then((r) =>
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console.log(Object.keys(r).sort().join(",")),
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);
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