Type Alias AppendArgument<Func, Arg>

AppendArgument: Func extends (...args: infer Args) => infer ReturnType
? (...args: [...Args, Arg]) => ReturnType
: never

给函数添加参数

type Fn = (a: string) => number
type NewFn = AppendArgument<Fn, boolean> // (a: string, b: boolean) => number