anki/ts/lib/nightmode.ts

// Copyright: Ankitects Pty Ltd and contributors
// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

/** Add night-mode class to documentElement if hash location is #night, and
    return true if added. */
export function checkNightMode(): boolean {
    const nightMode = window.location.hash == "#night";
    if (nightMode) {
        document.documentElement.className = "night-mode";
        document.documentElement.dataset.bsTheme = "dark";
    }
    return nightMode;
}