pipe.ts

export function pipe<I, R1, R>(f1: (a: I) => R1, f2: (a: R1) => R): (a: I) => R;
export function pipe<I, I1, R1, R>(f1: (a: I, b: I1) => R1, f2: (a: R1) => R): (a: I, b: I1) => R;
export function pipe<I, R1, R2, R>(
    f1: (a: I) => R1,
    f2: (a: R1) => R2,
    f3: (a: R2) => R
): (a: I) => R;
export function pipe<I, I1, R1, R2, R>(
    f1: (a: I, b?: I1) => R1,
    f2: (a: R1) => R2,
    f3: (a: R2) => R
): (a: I, b?: I1) => R;
export function pipe<I, R>(): (a: I) => R {
    const args = Array.from(arguments);
    return function executer(...a) {
        return args.reduce(
            (prevResult, f) => (Array.isArray(prevResult) ? f(...prevResult) : f(prevResult)),
            a
        );
    };
}