因此，我正在尝试在我的项目中设置 redux。并且在 Reducer 中出现了一个非常奇怪的问题：未捕获的 TypeError：无法读取未定义的属性（读取“type”）。 这是 Reducer.ts：

import { MarkerActionEnum, MarkerActions, MarkerState } from './types';

const initialState: MarkerState = {
  data: undefined,
};

export function MarkerReducer(
  action: MarkerActions,
  state = initialState,
): MarkerState {
  switch (action.type) {
    case MarkerActionEnum.ADD_MARKER:
      return {
        ...state,
        data: action.payload,
      };
    case MarkerActionEnum.DELETE_MARKER: {
      return { data: undefined };
    }
    default:
      return state;
  }
}

export default MarkerReducer;

以及 Reducer 的 types.ts：

import { Action } from 'redux';
import { MarkerType } from '../../pages/mapPage/components/CustomMap';

export interface MarkerState {
  data: MarkerType | undefined;
}

export enum MarkerActionEnum {
  ADD_MARKER = 'marker/ADD_MARKER',
  DELETE_MARKER = 'marker/DELETE_MARKER',
}

export interface AddMarkerInterface
  extends Action<MarkerActionEnum.ADD_MARKER> {
  type: MarkerActionEnum.ADD_MARKER;
  payload: { longitude: number; latitude: number };
}

export interface DeleteMarkerInterface
  extends Action<MarkerActionEnum.DELETE_MARKER> {
  type: MarkerActionEnum.DELETE_MARKER;
}

export type MarkerActions = AddMarkerInterface | DeleteMarkerInterface;

日志表明问题发生在 Reducer 的第 11 行，就在 switch (action.type) 中 有人知道或遇到过类似的事情吗？