javascript - Typescript:如何在 Redux 中输入 Dispatch

Question

例如，我想在此处删除 dispatch: any:

export const fetchAllAssets = () => (dispatch: any) => {
  dispatch(actionGetAllAssets);
  return fetchAll([getPrices(), getAvailableSupply()]).then((responses) =>
    dispatch(actionSetAllAssets(formatAssets(responses))));
}

我在上面分派(dispatch)了 2 个 Action ，actionsGetAllAssets 和 actionsSetAllassets。

以下是两者的接口(interface)和 actionCreators:

// Interfaces
interface IActions {
  GET_ALL_ASSETS: string;
  SET_ALL_ASSETS: string;
  GET_MARKET_PRICES: string;
  SET_MARKET_PRICES: string;
  ADD_COIN_PORTFOLIO: string;
  ADD_COINS_PORTFOLIO: string;
  UPDATE_COIN_PORTFOLIO: string;
  REMOVE_COIN_PORTFOLIO: string;
} 

interface IGetAllAssets {
  type: IActions['GET_ALL_ASSETS'];
  loading: boolean;
}

interface ISetAllAssets {
  type: IActions['SET_ALL_ASSETS'];
  assets: IAsset[];
  loading: boolean;
}

// ACTION CREATORS
const actionGetAllAssets = () => ({
  type: Actions.GET_ALL_ASSETS,
  loading: true
});

const actionSetAllAssets = (data: any) => ({
  type: Actions.SET_ALL_ASSETS,
  assets: data,
  loading: false
});

然后我尝试了以下方法:

export const fetchAllAssets = () => (dispatch: IGetAllAssets | ISetAllAssets) => {
  console.log('fetchAllAssets', dispatch);
  dispatch(actionGetAllAssets);
  return fetchAll([getPrices(), getAvailableSupply()]).then((responses) =>
    dispatch(actionSetAllAssets(formatAssets(responses))));
}

但是它会产生这个 Typescript 错误:

Cannot invoke an expression whose type lacks a call signature. Type 'IGetAllAssets | ISetAllAssets' has no compatible call signatures.ts(2349)

想法？或者是否有不同的方式来输入调度事件？

Answer 1

Redux 类型有一个通用的 Dispatch<A>您可以使用的类型，其中 A是 Action 的类型。

export const fetchAllAssets = () => (dispatch: Dispatch<IGetAllAssets | ISetAllAssets>) => {
  // ...
}