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// Repros from #43425
type Transform1<T> = ((value: string) => T) | (string extends T ? undefined : never);
type Transform2<T> = string extends T ? ((value: string) => T) | undefined : (value: string) => T;
function test<T>(f1: Transform1<T>, f2: Transform2<T>) {
f1?.("hello");
f2?.("hello");
}
function f1<T>(x: T | (string extends T ? null | undefined : never)) {
let z = x!; // NonNullable<T>
}
function f2<T, U extends null | undefined>(x: T | U) {
let z = x!; // NonNullable<T>
}
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