Question

我在应用程序中使用打字稿，但发现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typescript@3.3，react@16.8.5，react-redux@7.1.0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)

这是异步操作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))
      })
  }
}

错误发生在export行，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，articlets（2345）

Answer 1

最少的步骤即可编译代码：

MyOwnProps应该

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>
}

如果要提供connect函数的类型，请像这样添加MyState作为最后一个类型

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)

工作结果如此

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)

Answer 2

这是一个有效的示例，根据您的示例，如何在使用redux时键入反应文件。

// article-container.js file
import { connect, DispatchProp } from "react-redux";
import { Component } from "react";

// import the real RouteComponent, this is just a demo example
interface RouteComponentProps<T> {
  match: { params: T };
}
// article
interface IArticle {
  title: string;
  author: string;
}
// import the real Article, this is just a demo example

const Article = ({ article }: { article: IArticle }) => {
  return <div>{article.title}</div>;
};

// import the real fetchArticle, this is just a demo example

const fetchArticle = (id: string) => {
  return {
    type: "SOME_ACTION",
    payload: {
      id,
    },
  };
};

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

// stateMapToProps
interface MyStateProps {
  article: IArticle;
}

// router match
interface MatchParams {
  id: string;
}

// own props
interface MyOwnProps {
  article: IArticle;
}
type AllProps = MyOwnProps & RouteComponentProps<MatchParams> & DispatchProp;

class ArticleContainer extends Component<AllProps> {
  constructor(props: AllProps) {
    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} />;
  }
}

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

export default connect(
  mapStateToProps
)(ArticleContainer);

并像这样使用它


import ArticleContainer from "./article-container";

export default () => {
  // this is coming from router, just an example for demonstration
  const match = { params: { id: "23" } };
  return (
    <div>
      <ArticleContainer match={match} />
    </div>
  );
};

Answer 3

最后解决了删除create table #T(Id int, Dept varchar(10),Amount int) insert into #T values(1,'Accounting',10000),(2,'Catering',5000),(3,'Cleaning',5000) declare @Totll float = (Select sum(Amount) from #T) Select * from #T union select Id,Convert(varchar(50), (Amount/@Totll)*100)+'%',0 from #T order by Id,Amount desc方法的泛型声明，并将connect与异步操作创建者一起使用的问题。代码如下。

ThunkDispatch

感谢您的帮助！

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

3 个答案: