javascript - '(dispatch: Dispatch 类型的参数, ownProps: OwnProps) => DispatchProps' 不可分配给“DispatchProps”类型的参数

Question

我正在使用 redux 和 typescript 作为语言创建一个反应应用程序。我按照这篇文章的建议来创建类型mapStateToProps和maptDispatchToProps功能。这是我的容器：

import { connect } from 'react-redux'
import { AppState } from 'src/store';
import { changeFilter } from 'src/store/tasks/actions';
import { Dispatch } from 'redux';
import {  VisibilityFilter } from 'src/store/tasks/types';
import * as React from 'react';

 interface OwnProps {
    filter: VisibilityFilter;
  }

  interface StateProps {
    active: boolean
  }

  interface DispatchProps {
    onClick: () => void
  }

  type Props = StateProps & DispatchProps & OwnProps

  export const Filter: React.FC<Props> = props => {
    const { active, onClick, children } = props;

    return (
      <button
        onClick={onClick}
        disabled={active}
        style={{
          marginLeft: "4px"
        }}
      >
        {children}
      </button>
    );
  };


const mapStateToProps = (state: AppState, ownProps: OwnProps): StateProps => ({
    active: ownProps.filter === state.tasksState.visibilityFilter
  })

  const mapDispatchToProps = (dispatch: Dispatch<any>, ownProps:OwnProps): DispatchProps => ({
    onClick: () => dispatch(changeFilter(ownProps.filter))
  })

  export default connect<StateProps,DispatchProps,OwnProps>(
    mapStateToProps,
    mapDispatchToProps
  )(Filter)

但是我在connect函数中出现以下错误mapDispatchToProps：

'(dispatch: Dispatch, ownProps: OwnProps) => DispatchProps' 类型的参数不可分配给'DispatchProps' 类型的参数。类型 '(dispatch: Dispatch, ownProps: OwnProps) => DispatchProps' 中缺少属性 'onClick' 但在类型 'DispatchProps'.ts(2345) Filter.tsx(17, 5) 中是必需的：此处声明了'onClick'。Filter.tsx(49, 5)：你的意思是调用这个表达式吗？

我的函数拒绝它的DispatchProps类型有什么问题吗？connect

如果您需要知道这些是我正在使用的库：

  "dependencies": {
    "react": "^16.8.6",
    "react-dom": "^16.8.6",
    "react-redux": "^7.0.2",
    "react-scripts-ts": "3.1.0",
    "redux": "^4.0.1"
  },
  "devDependencies": {
    "@types/jest": "^24.0.11",
    "@types/node": "^11.13.4",
    "@types/react": "^16.8.13",
    "@types/react-dom": "^16.8.4",
    "@types/react-redux": "^7.0.6",
    "typescript": "^3.4.3"
  }

更新

如果我删除函数中的泛型类型，connect那么错误就会在这里消失，它会推断出类型：

但是现在当我使用Filter容器时，我不得不在定义中添加 onclick 属性：

标签： javascriptreactjstypescriptreduxreact-redux

Answer 1

代替

const mapDispatchToProps = (dispatch: Dispatch<any>, ownProps:OwnProps): DispatchProps => ({
    onClick: () => dispatch(changeFilter(ownProps.filter))
  })

做这个

    //in the import section 
    import { bindActionCreators } from "redux";
        const mapDispatchToProps = (dispatch: Dispatch<any>, ownProps:OwnProps): DispatchProps => {
            return bindActionCreators ({

            changeFilter         }),
dispatch
 }

在mapDispatchToProps您的情况下，返回一个包含 onClick 函数的对象，这不是它的预期行为