打字稿中自定義對象的類型

Question

我是打字稿的新手，我創建了這個對象：

const initialState = {
    title: {
        value: "",
        error: false
    },
    amount: {
        value: 0,
        error: false
    },
    type: "Food",
    time: new Date()
} 

我想使用 is 作為 useState 的初始狀態。 因此我現在想要將我需要作為類型傳遞給我的 useState 的內容。 const [Form, setForm] = useState< "what should come here?" >(initialState) const [Form, setForm] = useState< "what should come here?" >(initialState) ；

提前致謝，

Answer 1

interface IState {
  title: {
    value: string;
    error: boolean;
  };
  amount: {
    value: number;
    error: boolean;
  };
  type: string;
  time: Date;
}

const [Form, setForm] = useState<IState>(initialState);

Answer 2

你可以這樣做：

interface SomeName {
    value: string;
    error: boolean;
}

interface IState {
  title: SomeName;
  amount: SomeName;
  type: string;
  time: Date;
}

const initialState: IState = {
    title: {
       value: "",
       error: false
    },
    amount: {
       value: 0,
       error: false
    },
    type: "Food",
    time: new Date()
} 

const [Form, setForm] = useState<IState>(initialState);