la-visitor/assets/core.js

import { color_mode } from "./color-mode.js";
import { push } from "./push.js";

document.addEventListener("DOMContentLoaded", () => {
    const app = document.querySelector(".app");
    const colors_state = new color_mode(app);
    const colors_changer = push("change-color", () => {
        colors_state.reverse();
    });

    app.appendChild(colors_changer);
});