converse.js/src/plugins/rootview/utils.js

Browser based XMPP chat client

import { api } from "@converse/headless";

export function getTheme() {
    if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
        return api.settings.get("dark_theme");
    } else {
        return api.settings.get("theme");
    }
}

export function ensureElement() {
    if (!api.settings.get("auto_insert")) {
        return;
    }
    const root = api.settings.get("root");
    if (!root.querySelector("converse-root") && !root.matches?.("converse-root")) {
        const el = document.createElement("converse-root");
        const body = root.querySelector("body");
        if (body) {
            body.appendChild(el);
        } else {
            root.appendChild(el); // Perhaps inside a web component?
        }
    }
}