Rocket.Chat/packages/rocketchat-lib/client/lib/callMethod.js

/**
 * Wraps a Meteor method into a Promise.
 * This is particularly useful for creating information dialogs after execution of a Meteor method
 * @param {The Meteor method to be calls} method
 * @param {the method's parameters} params
 */
export const call = (method, ...params) => new Promise((resolve, reject) => {
	Meteor.call(method, ...params, (err, result) => {
		if (err) {
			handleError(err);
			return reject(err);
		}
		return resolve(result);
	});
});