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[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
我正在嘗試將Typescript與React和Redux結合使用。
但是我現在正在掙扎。
我收到此錯誤:
./src/containers/Hello.tsx [tsl] /home/marc/Development/TypeScript-React-Starter-master/src/containers/Hello.tsx(20,61)中的錯誤TS2345:“ typeof Hello”類型的參數不能分配給'Component <{enthusiasmLevel:number; 名稱:字符串; }&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm; }>”。 類型'Hello'的類型不能分配給'ComponentClass <{enthusiasmLevel:number; 名稱:字符串; }&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm; }>”。 類型“ Hello”不能分配給類型“ Component <{enthusiasmLevel:number; 名稱:字符串; }&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm; },ComponentState>。 屬性“ setState”的類型不兼容。 類型'{(f:(prevState:{},props:Props)=> Pick <{},K>,callback ?:(()=> any)| undefined):void; (狀態:Pick <{},K>,回調函數?:(()=> any)|未定義):void; }'不能分配給類型'{(f:(prevState:ComponentState,props:{enthusiasmLevel:number; name:string;}&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm;} = >選擇,回調?:(()=>任何)|未定義):void; (狀態:Pick <...>,回調?:(()=> any)...'。參數'f'和'f'的類型不兼容。參數'props'和'props'的類型不兼容。類型'Props'不能分配給類型'{enthusiasmLevel:number; name:string;}&{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm;}'。類型'Props'不能分配給類型'{onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm;}'。屬性'onIncrement'的類型不兼容。類型'(()=> void)|未定義'不能分配給類型'(( )=> IncrementEnthusiasm'。類型'undefined'不能分配給類型'()=> IncrementEnthusiasm'。
那是我的React組件:
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('!');
}
那是發生錯誤的文件:
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;
}
我不確定這有什么問題。 唯一可行的解決方法是:
export default connect(mapStateToProps, mapDispatchToProps)(Hello as any);
在我眼里這是一個丑陋的解決方案。
錯誤消息中指出, Props
接口的類型提示與connect()()
所需的接口不完全匹配:
類型“ Hello”不能分配給類型“ Component <{enthusiasmLevel:number; 名稱:字符串; }& {onIncrement:()=> IncrementEnthusiasm; onDecrement:()=> DecrementEnthusiasm; } ,ComponentState>。
onIncrement
和onDecrement
道具不能是可選的,並且 onIncrement
和onDecrement
道具不會返回void
而是分別返回IncrementEnthusiam
和DecrementEnthusiam
。 您的Props
界面應如下所示:
export interface Props {
name: string;
enthusiasmLevel: number;
onIncrement: () => IncrementEnthusiasm;
onDecrement: () => DecrementEnthusiasm;
}
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