Reselect Redux函数返回的TypeScript类型？

Question

是否可以在Redux的重新选择中定义createSelector函数的返回类型？

我无法从官方文档中了解到这一点：https://github.com/reduxjs/reselect#q-are-there-typescript-typings

这个小抄似乎也没有提供这一点：https://github.com/piotrwitek/react-redux-typescript-guide#selectors-with-reselect

import { createSelector } from 'reselect';

import { TodosState } from './reducer';

export const getTodos = (state: TodosState) => state.todos;

export const getTodosFilter = (state: TodosState) => state.todosFilter;

export const getFilteredTodos = createSelector(getTodos, getTodosFilter, (todos, todosFilter) => {
  switch (todosFilter) {
    case 'completed':
      return todos.filter(t => t.completed);
    case 'active':
      return todos.filter(t => !t.completed);

    default:
      return todos;
  }
});

如果我知道从getFilteredTodos返回的结果是这样的：

type Return = {
  text: string;
  completed: boolean;
}[]

那么我可以定义这个吗？

Answer 1

您可以像这样定义返回：

export const getFilteredTodos = createSelector(getTodos, getTodosFilter, (todos, todosFilter) : { text: string; completed: boolean; }[] => {
  switch (todosFilter) {
    case 'completed':
      return todos.filter(t => t.completed);
    case 'active':
      return todos.filter(t => !t.completed);

    default:
      return todos;
  }
});