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Infer implementation signature based on overload signatures #14972

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@vilicvane

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@vilicvane

Probably a duplicate, but I cannot find one.

function foo(p1: string): void;
function foo(p1: number, p2: boolean): void;
function foo(p1, p2) {
    // p1: string | number;
    // p2: boolean | undefined;
}

If there could be constraints among parameters via type guards, it would be awesome.

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