Rocket.Chat/ee/app/license/client/index.ts

import { CachedCollectionManager } from '../../../../app/ui-cached-collection';
import { callMethod } from '../../../../app/ui-utils/client/lib/callMethod';

const allModules = new Promise<Set<string>>((resolve, reject) => {
	CachedCollectionManager.onLogin(async () => {
		try {
			const features: string[] = await callMethod('license:getModules');
			resolve(new Set(features));
		} catch (e) {
			console.error('Error getting modules', e);
			reject(e);
		}
	});
});

export async function hasLicense(feature: string): Promise<boolean> {
	try {
		const features = await allModules;
		return features.has(feature);
	} catch (e) {
		return false;
	}
}