javascript - 如何在带有Typescript的react-redux中正确使用'connect'

我在应用程序中使用打字稿，但是发现react-redux出现了一些问题。 “连接”方法报告了一个问题，由于我是打字稿和Redux的新秀，所以我对此一无所知。我应该怎么做或应该在代码中的什么地方进行修改？非常感谢

使用[email protected]，[email protected]，[email protected]构建的应用程序。

// article
interface IArticle {
  title: string,
  author: string
}

// state
interface MyState {
  list: [],
  article: IArticle
}

// stateMapToProps
interface MyStateProps {
  article: IArticle
}

// router match
interface MatchParams {
  id: string
}

// own props
interface MyOwnProps extends RouteComponentProps < MatchParams > {
  article: IArticle,
  dispatch: (o: object) => {}
}

class ArticleContainer extends Component < MyOwnProps, {} > {
  constructor(props: MyOwnProps) {
    super(props);
  }

  componentDidMount() {
    const {
      dispatch
    } = this.props;
    const id = this.props.match.params.id
    dispatch(fetchArticle(id))
  }

  render() {
    const {
      article
    } = this.props;
    return ( <
      Article article = {
        article
      } > < /Article>
    )
  }
}

const mapStateToProps = (state: MyState): MyStateProps => {
  return {
    article: state.article
  }
}

export default connect < MyStateProps, {}, {
  article: IArticle
} > (
  mapStateToProps
)(ArticleContainer)

这是异步动作fetchArticle的代码

function fetchArticle(id: string) {
  return function(dispatch: (action: AnyAction) => {}): Promise<void> {
    dispatch(getArticle(id))

    return axios.get(`/article/${id}`)
      .then(res => {
        dispatch(getArticleSuccess(res.data))
      })
  }
}

export行发生错误，并且消息如下：


  类型'（state：MyState）=> MyStateProps'的参数不可分配
  参数类型为“ MapStateToPropsParam”。类型'（state：MyState）=> MyStateProps'不是
  可分配给“ MapStateToPropsFactory”类型。
      参数“状态”和“初始状态”的类型不兼容。
        类型“ {}”缺少类型“ MyState”中的以下属性：list，art​​iclets（2345）

最佳答案

能够编译代码的最少步骤：


MyOwnProps应该是

import { AnyAction } from 'redux';

interface AppThunkAction<TAction> {
    (dispatch: (action: TAction) => void, getState: () => MyState): any;
}

// As you're going to dispatch thunk actions, dispatch should be overloaded
interface Dispatch<TAction> {
    (action: AppThunkAction<TAction>): any
    (action: TAction): TAction
}

// own props
interface MyOwnProps extends RouteComponentProps<MatchParams> {
    article: IArticle,
    dispatch: Dispatch<AnyAction>
}

如果要为connect函数提供类型，请添加MyState作为最后一个类型，如下所示

export default connect <MyStateProps, {}, {
        article: IArticle
    }, MyState >(
        mapStateToProps
)(ArticleContainer)

或者您可以允许编译器自己推断类型，这是首选

export default connect(
    mapStateToProps
)(ArticleContainer)

所以工作结果

import { Component } from 'react';
import { RouteComponentProps } from 'react-router-dom';
import { connect, ResolveThunks } from 'react-redux';
import { AnyAction } from 'redux';
import axios from 'axios';

// article
interface IArticle {
    title: string,
    author: string
}

// state
interface MyState {
    list: [],
    article: IArticle
}

// stateMapToProps
interface MyStateProps {
    article: IArticle
}

// router match
interface MatchParams {
    id: string
}

export interface AppThunkAction<TAction> {
    (dispatch: (action: TAction) => void, getState: () => MyState): any;
}

interface Dispatch<TAction> {
    (action: AppThunkAction<TAction>): any
    (action: TAction): TAction
}

// own props
interface MyOwnProps extends RouteComponentProps<MatchParams> {
    article: IArticle,
    dispatch: Dispatch<AnyAction>
}

function getArticle(id: string) {
    return {
        type: 'GET_ARTICLE',
        id
    }
}

function getArticleSuccess(i: any) {
    return {
        type: 'SET_ARTICLE',
        i
    }
}



const fetchArticle = (id: string): AppThunkAction<AnyAction> =>
    (dispatch, getState) => {
        dispatch(getArticle(id))

        return axios.get(`/article/${id}`)
            .then(res => {
                dispatch(getArticleSuccess(res.data))
            })
    }

class ArticleContainer extends Component<MyOwnProps, {}> {
    constructor(props: MyOwnProps) {
        super(props);
    }

    componentDidMount() {
        const {
            dispatch
        } = this.props;
        const id = this.props.match.params.id
        dispatch(fetchArticle(id))
    }

    render() {
        const {
            article
        } = this.props;
        return (<div>article: {article}</div>
          )
        }
      }

const mapStateToProps = (state: MyState): MyStateProps => {
  return {
                article: state.article
          }
        }

export default connect(
            mapStateToProps
)(ArticleContainer)

关于javascript - 如何在带有Typescript的react-redux中正确使用'connect'，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/56963211/