How can I achieve the reverse of joining two function signatures together in TypeScript?

type A = (v1: number, v2: number) => number
type B = (v1: string, v2: string) => string

type C = A & B;

declare const c: C;

c(1, 2);
c("a", "b");
c(1, "b"); // <- gives error as expected

type D = Exclude // never

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