Bad function overloadingJS-0388

Warns for any two overloads that could be unified into one by using a union or an optional/rest parameter.

Bad Practice

function f(x: number): void;
function f(x: string): void;

f(): void;
f(...x: number[]): void;

Recommended

function f(x: number | string): void;

function f(x?: ...number[]): void;