Question

我试图使用HOC制作一个React示例应用程序。但是因为我在Typescript中遇到错误，所以我无法继续制作了。

我在下面收到此错误消息

(34,38): Type '{ timeLeft: number; timerId?: Timer | undefined; }' is not assignable to type 'StateHandler<LStateProps>'.
  Type '{ timeLeft: number; timerId?: Timer | undefined; }' provides no match for the signature '(...payload: any[]): Partial<LStateProps> | undefined'.

您能告诉我如何解决吗？

import * as React from 'react';
import {
  compose,
  StateHandler,
  StateHandlerMap,
  withStateHandlers,
} from 'recompose';

import Timer, { TimerProps } from 'components/Timer';

interface LStateProps {
  timeLeft: number;
  timerId?: NodeJS.Timer;
}

type LStateHandlerProps = {
  reset: () => StateHandler<LStateProps>;
  tick: () => StateHandler<LStateProps>;
  setTimerId: (timerId: NodeJS.Timer) => StateHandler<LStateProps>;
} & StateHandlerMap<LStateProps>;

type EnhancedTimerProps = TimerProps & LStateProps & LStateHandlerProps;

const enhance = compose<EnhancedTimerProps, TimerProps>(
  withStateHandlers<LStateProps, LStateHandlerProps, TimerProps>(
    props => ({
      timeLeft: props.limit,
    }),
    {
      reset: (state, props) => () => ({
        ...state,
        timeLeft: props.limit,
      }),
      tick: (state, props) => () => ({
        ...state,
        timeLeft: state.timeLeft - 1,
      }),
      setTimerId: (state, props) => (timerId: NodeJS.Timer) => ({
        ...state,
        timerId,
      }),
    },
  ),
);

export default enhance(Timer as React.SFC<EnhancedTimerProps>);

Answer 1

解决方法是像这样简单地更改您的类型LStateHandlerProps

type LStateHandlerProps = {
  reset: StateHandler<LStateProps>;
  tick: StateHandler<LStateParops>;
  setTimerId: StateHandler<LStateProps>;
} & StateHandlerMap<LStateProps>;

说明：如果将鼠标悬停在该状态的任何处理程序上，您将看到类似这样的函数类型

reset(state: LStateProps, props: TimerProps): () => StateHandler<LStateProps>

这种类型的问题是StateHandler<LStateProps>的定义是一个函数

type StateHandler<TState> = (...payload: any[]) => Partial<TState> | undefined;

因此，这意味着reset函数的类型不是双箭头，而是-与您的函数ex不匹配的三箭头。

 reset: (state, props) => () => ({
     ...state,
     timeLeft: props.limit,
 })

如何解决打字稿中有关`withStateHandlers`的错误

1 个答案: