我正在尝试将 Typescript 与 React 和 Redux 相结合。
但我现在很挣扎。
我遇到了这个错误:
./src/containers/Hello.tsx [tsl] ERROR in /home/marc/Development/TypeScript-React-Starter-master/src/containers/Hello.tsx(20,61) TS2345: Argument of type 'typeof Hello' is not assignable to parameter of type 'Component<{ enthusiasmLevel: number; name: string; } & { onIncrement: () => IncrementEnthusiasm; onDecrement: () => DecrementEnthusiasm; }>'. Type 'typeof Hello' is not assignable to type 'ComponentClass<{ enthusiasmLevel: number; name: string; } & { onIncrement: () => IncrementEnthusiasm; onDecrement: () => DecrementEnthusiasm; }>'. Type 'Hello' is not assignable to type 'Component<{ enthusiasmLevel: number; name: string; } & { onIncrement: () => IncrementEnthusiasm; onDecrement: () => DecrementEnthusiasm; }, ComponentState>'. Types of property 'setState' are incompatible. Type '{ (f: (prevState: {}, props: Props) => Pick<{}, K>, callback?: (() => any) | undefined): void; (state: Pick<{}, K>, callback?: (() => any) | undefined): void; }' is not assignable to type '{ (f: (prevState: ComponentState, props: { enthusiasmLevel: number; name: string; } & { onIncrement: () => IncrementEnthusiasm; onDecrement: () => DecrementEnthusiasm; }) => Pick, callback?: (() => any) | undefined): void; (state: Pick<...>, callback?: (() => any)...'. Types of parameters 'f' and 'f' are incompatible. Types of parameters 'props' and 'props' are incompatible. Type 'Props' is not assignable to type '{ enthusiasmLevel: number; name: string; } & { onIncrement: () => IncrementEnthusiasm; onDecrement: () => DecrementEnthusiasm; }'. Type 'Props' is not assignable to type '{ onIncrement: () => IncrementEnthusiasm; onDecrement: () => DecrementEnthusiasm; }'. Types of property 'onIncrement' are incompatible. Type '(() => void) | undefined' is not assignable to type '() => IncrementEnthusiasm'. Type 'undefined' is not assignable to type '() => 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('!');
}
这是发生错误的文件:
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(interface):
export interface StoreState {
languageName: string;
enthusiasmLevel: number;
}
我不确定那有什么问题。 唯一可行的解决方法是:
export default connect(mapStateToProps, mapDispatchToProps)(Hello as any);
在我看来这是一个丑陋的解决方案。
最佳答案
Props
接口(interface)的类型提示与 connect()()
预期的接口(interface)不完全匹配,如错误消息所示:
Type 'Hello' is not assignable to type 'Component<{ enthusiasmLevel: number; name: string; } & { onIncrement: () => IncrementEnthusiasm; onDecrement: () => DecrementEnthusiasm; }, ComponentState>'.
onIncrement
和onDecrement
Prop 不能是可选的,并且onIncrement
和onDecrement
Prop 不返回void
但返回IncrementEnthusiam
和DecrementEnthusiam
分别。
你的 Props
界面应该是这样的:
export interface Props {
name: string;
enthusiasmLevel: number;
onIncrement: () => IncrementEnthusiasm;
onDecrement: () => DecrementEnthusiasm;
}
关于javascript - 带有 Typescript 和 react-redux 的有状态组件 : Argument of type 'typeof MyClass' is not assignable to parameter of type Component,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54148861/