updux/src/tutorial.test.ts

import Updux, { createAction, withPayload } from './index.js';
import u from '@yanick/updeep-remeda';

export const expectType = <T>(value: T) => value;

test('initialState state', () => {
    const initialState = {
        next_id: 1,
        todos: [],
    };
    const dux = new Updux({
        initialState,
    });

    expectType<{
        next_id: number;
        todos: unknown[];
    }>(dux.initialState);

    expect(dux.initialState).toEqual(initialState);

    const store = dux.createStore();

    expect(store.getState()).toEqual(initialState);
});

test('actions', () => {
    const addTodo = createAction('addTodo', withPayload<string>());
    const todoDone = createAction('todoDone');

    const todosDux = new Updux({
        actions: {
            addTodo,
            todoDone,
        },
    });

    expect(todosDux.actions.addTodo('write tutorial')).toEqual({
        type: 'addTodo',
        payload: 'write tutorial',
    });
});

test('mutation', () => {
    const addTodo = createAction('addTodo', withPayload<string>());

    type Todo = {
        description: string;
        id: number;
        done: boolean;
    };

    const dux = new Updux({
        initialState: { nextId: 0, todos: [] as Todo[] },
    });

    dux.addMutation(addTodo, (description) => (state) => {
        state.todos.unshift({ description, id: state.nextId, done: false });
        state.nextId++;
    });
});