model.js

import { action } from "easy-peasy";

let id = 0;

export default {
  todos: {},
  // actions
  add: action((state, text) => {
    const todo = {
      id: id++,
      done: false,
      text
    };
    state.todos[todo.id] = todo;
  }),
  toggle: action((state, id) => {
    state.todos[id] = { ...state.todos[id], done: !state.todos[id].done };
  }),
  delete: action((state, id) => {
    // 🤯 don't worry, we're using immer under the hood.
    // All immutable pitchforks can be put down!
    delete state.todos[id];
  })
};