Question

设置reuder，

之一时出现以下错误

/Users/Lxinyang/Desktop/angular/breakdown/ui/app/src/reducers/filters.spec.ts
(12,9): error TS2345: Argument of type '{}' is not assignable to parameter of type '{ selectionState: { source: string; timeRange: Date[]; }; } | undefined'.
  Type '{}' is not assignable to type '{ selectionState: { source: string; timeRange: Date[]; }; }'.
    Property 'selectionState' is missing in type '{}'.

reducer的代码，

const DATE_IN_MILLISECONDS = 60 * 60 * 24 * 1000
const todayDate = new Date()
const startDate = new Date(todayDate.getTime() - 6 * DATE_IN_MILLISECONDS)
const defaultFiltersState = {
  selectionState: { source: 'all', timeRange: [startDate, todayDate] }
}

export function filters(state = defaultFiltersState, action: any) {}

我不确定为什么会遇到此问题，因为我从未将{}指定为默认状态。

以下代码是根，

export default combineReducers({ dataSource, filters, filtersVideo })

Answer 1

原因是我在创建商店时设置了空{}状态，

const configureStore = (initialState: any) => {
  return createStore(rootReducer, initialState, applyMiddleware(thunk))
}

当app init，

const store = configureStore({})

TypeScript无法为缩减器

1 个答案: