TypeScript获取函数参数类型

function updata(state) {
    return {
        router: state.router
    }
}

type ArrType = Parameters<typeof state>
// ArrType => [state: any]

type GetType<T> = T extends (arg: infer P) => void ? P : string;
type StateType = GetType<typeof state>
//  StateType => any
// 因为state没有设置类型，所以ts推断state的类型为any

type Return = ReturnType<typeof state>
// ReturnType => 
// {
//     router: any;
//}