export function promiseOfCallback<T>(fun: (cb: (err: any, val?: T) => void) => void) {
	return new Promise<T>((resolve, reject) => {
		try {
			fun((e: any, v: any) => {
				if (e) {
					reject(e);
				} else {
					resolve(v);
				}
			});
		} catch (e) {
			reject(e);
		}
	});
}