[React Typescript] Function overload in React hook

import { useState } from "react";
import { Equal, Expect } from "../helpers/type-utils";

type UseStateReturnValue<T> = {
  value: T;
  set: React.Dispatch<React.SetStateAction<T>>;
};

export function useStateAsObject<T>(): UseStateReturnValue<T | undefined>;
export function useStateAsObject<T>(initial: T): UseStateReturnValue<T>;
export function useStateAsObject<T>(initial?: T) {
  const [value, set] = useState(initial);

  return {
    value,
    set,
  };
}

const notUndefined = useStateAsObject({ name: "Matt" });

type ExampleTests = [
  Expect<Equal<typeof notUndefined.value, { name: string }>>,
  Expect<
    Equal<
      typeof notUndefined.set,
      React.Dispatch<React.SetStateAction<{ name: string }>>
    >
  >,
];

const hasUndefined = useStateAsObject<number>();

type NumTests = [
  Expect<Equal<typeof hasUndefined.value, number | undefined>>,
  Expect<
    Equal<
      typeof hasUndefined.set,
      React.Dispatch<React.SetStateAction<number | undefined>>
    >
  >,
];

 

posted @   Zhentiw  阅读(19)  评论(0编辑  收藏  举报
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