21 lines
423 B
TypeScript
21 lines
423 B
TypeScript
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// @strict: true
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// Repro from #35655
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interface Box<T> { data: T }
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type BoxTypes = Box<{ x: string }> | Box<{ y: string }>;
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type BoxFactoryFactory<TBox> = TBox extends Box<infer T> ? {
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(arg: T): BoxFactory<TBox> | undefined
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} : never;
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interface BoxFactory<A> {
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getBox(): A,
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}
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declare const f: BoxFactoryFactory<BoxTypes>;
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const b = f({ x: "", y: "" })?.getBox();
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if (b) {
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const x = b.data;
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}
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