uBlock/platform/mv3/extension/js/theme.js

/*******************************************************************************

    uBlock Origin - a browser extension to block requests.
    Copyright (C) 2014-present Raymond Hill

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see {http://www.gnu.org/licenses/}.

    Home: https://github.com/gorhill/uBlock
*/

/* jshint esversion:11 */

'use strict';

import { dom } from './dom.js';

/******************************************************************************/

const mql = self.matchMedia('(prefers-color-scheme: dark)');
const theme = mql instanceof Object && mql.matches === true
    ? 'dark'
    : 'light';
dom.cl.toggle(dom.html, 'dark', theme === 'dark');
dom.cl.toggle(dom.html, 'light', theme !== 'dark');