immer redux

.jsx

import produce from "immer"

// Reducer with initial state
const INITIAL_STATE = [
    /* bunch of todos */
]

const todosReducer = produce((draft, action) => {
    switch (action.type) {
        case "toggle":
            const todo = draft.find(todo => todo.id === action.id)
            todo.done = !todo.done
            break
        case "add":
            draft.push({
                id: "todo_" + Math.random(),
                title: "A new todo",
                done: false
            })
            break
        default:
            break
    }
})