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Malte UblandClaude Opus 5.5
41364d9c08
`[...maybe]` over a source the checker typed wider than the iterable it holds at run time (`T | undefined` from an indexed read under indexed-access strictness, an optional local) and `push(...value)` over an untyped or widened source were SC1090 refusals. They now drain through the checked iterator walk, validating each element into the target slot, and throw Node's not-iterable TypeError for null/undefined. `widenedIterableType` recognises a union of exactly one iterable arm plus unit arms; `checkedIteratorPack` is exported so the array-method spread path reuses the same walk. Corpus 8504 covers `[...digit]` from a `string | undefined`, a `[...any]` array literal, a `push(...any)`, and `push(...(provider.x ?? []))`. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
40 lines
1.3 KiB
TypeScript
40 lines
1.3 KiB
TypeScript
// Array spreads of sources the checker types wider than the iterable they
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// hold: a `string | undefined` indexed read, and an untyped value. Node
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// iterates whatever the value is; each element validates into the literal's
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// element slot.
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function expand(hex: string): string[] {
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const digit: string | undefined = hex[1];
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return [...digit];
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}
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console.log(JSON.stringify(expand("#0f0")));
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console.log(JSON.stringify(expand("#abcdef")));
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function doubled(hex: string): string {
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const digits = [...hex[1]].map((digit) => digit + digit).join("");
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return digits;
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}
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console.log(doubled("#0f0"));
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interface Item {
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api: string;
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id: number;
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}
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function collect(source: any): Item[] {
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return [...source];
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}
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console.log(JSON.stringify(collect([{ api: "a", id: 1 }, { api: "b", id: 2 }])));
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function pushAll(target: Item[], source: any): number {
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return target.push(...source);
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}
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const items: Item[] = [{ api: "seed", id: 0 }];
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console.log(pushAll(items, [{ api: "c", id: 3 }]), JSON.stringify(items));
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function collectStrings(provider: any): string[] {
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const triggerCharacters: string[] = [];
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triggerCharacters.push(...(provider.triggerCharacters ?? []));
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return triggerCharacters;
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}
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console.log(JSON.stringify(collectStrings({ triggerCharacters: ["@", "#"] })));
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console.log(JSON.stringify(collectStrings({})));
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