FPFn2
import type { FPFn2 } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";
FP function interface with 2 arguments.
interface FPFn2 <Result, Arg2, Arg1> {
(): FPFn2<Result, Arg2, Arg1>;
(arg2: Arg2): FPFn1<Result, Arg1>;
(arg2: Arg2, arg1: Arg1): Result;
}