Rocket.Chat/app/oembed/client/oembedYoutubeWidget.js

import { Meteor } from 'meteor/meteor';
import { Template } from 'meteor/templating';

import { getUserPreference } from '../../utils';

Template.oembedYoutubeWidget.helpers({
	collapsed() {
		if (this.collapsed) {
			return this.collapsed;
		}
		const user = Meteor.user();
		return getUserPreference(user, 'collapseMediaByDefault') === true;
	},
});