[英]Typescript error on React Component: Argument of type 'Element' is not assignable to parameter of type
[英]Stateful Component with Typescript and react-redux: Argument of type 'typeof MyClass' is not assignable to parameter of type Component
我正在尝试将Typescript与React和Redux结合使用。
但是我现在正在挣扎。
我收到此错误:
./src/containers/Hello.tsx [tsl] /home/marc/Development/TypeScript-React-Starter-master/src/containers/Hello.tsx(20,61)中的错误TS2345:“ typeof Hello”类型的参数不能分配给'Component <{enthusiasmLevel:number; 名称:字符串; }&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm; }>”。 类型'Hello'的类型不能分配给'ComponentClass <{enthusiasmLevel:number; 名称:字符串; }&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm; }>”。 类型“ Hello”不能分配给类型“ Component <{enthusiasmLevel:number; 名称:字符串; }&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm; },ComponentState>。 属性“ setState”的类型不兼容。 类型'{(f:(prevState:{},props:Props)=> Pick <{},K>,callback ?:(()=> any)| undefined):void; (状态:Pick <{},K>,回调函数?:(()=> any)|未定义):void; }'不能分配给类型'{(f:(prevState:ComponentState,props:{enthusiasmLevel:number; name:string;}&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm;} = >选择,回调?:(()=>任何)|未定义):void; (状态:Pick <...>,回调?:(()=> any)...'。参数'f'和'f'的类型不兼容。参数'props'和'props'的类型不兼容。类型'Props'不能分配给类型'{enthusiasmLevel:number; name:string;}&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm;}'。类型'Props'不能分配给类型'{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm;}'。属性'onIncrement'的类型不兼容。类型'(()=> void)|未定义'不能分配给类型'(( )=> IncrementEnthusiasm'。类型'undefined'不能分配给类型'()=> IncrementEnthusiasm'。
那是我的React组件:
import * as React from 'react';
import './Hello.css';
export interface Props {
name: string;
enthusiasmLevel: number;
onIncrement?: () => void;
onDecrement?: () => void;
}
class Hello extends React.Component<Props, {}> {
render(){
const { enthusiasmLevel, onIncrement, onDecrement } = this.props;
if (enthusiasmLevel <= 0) {
throw new Error('You could be a little more enthusiastic. :D');
}
return (
<div className="hello">
<div className="greeting">
Hello {name + getExclamationMarks(enthusiasmLevel)}
</div>
<div>
<button onClick={onDecrement}>-</button>
<button onClick={onIncrement}>+</button>
</div>
</div>
);
}
}
export default Hello;
// helpers
function getExclamationMarks(numChars: number) {
return Array(numChars + 1).join('!');
}
那是发生错误的文件:
import Hello from '../components/Hello';
import * as actions from '../actions/';
import { StoreState } from '../types/index';
import { connect, Dispatch } from 'react-redux';
export function mapStateToProps({ enthusiasmLevel, languageName }: StoreState) {
return {
enthusiasmLevel,
name: languageName,
};
}
export function mapDispatchToProps(dispatch: Dispatch<actions.EnthusiasmAction>) {
return {
onIncrement: () => dispatch(actions.incrementEnthusiasm()),
onDecrement: () => dispatch(actions.decrementEnthusiasm()),
};
}
export default connect(mapStateToProps, mapDispatchToProps)(Hello);
StoreState接口:
export interface StoreState {
languageName: string;
enthusiasmLevel: number;
}
我不确定这有什么问题。 唯一可行的解决方法是:
export default connect(mapStateToProps, mapDispatchToProps)(Hello as any);
在我眼里这是一个丑陋的解决方案。
错误消息中指出, Props
接口的类型提示与connect()()
所需的接口不完全匹配:
类型“ Hello”不能分配给类型“ Component <{enthusiasmLevel:number; 名称:字符串; }& {onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm; } ,ComponentState>。
onIncrement
和onDecrement
道具不能是可选的,并且 onIncrement
和onDecrement
道具不会返回void
而是分别返回IncrementEnthusiam
和DecrementEnthusiam
。 您的Props
界面应如下所示:
export interface Props {
name: string;
enthusiasmLevel: number;
onIncrement: () => IncrementEnthusiasm;
onDecrement: () => DecrementEnthusiasm;
}
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