fix further type problems

src/lib/helper/timeElapsed.ts

@@ -4,12 +4,7 @@ const DAY = 24 * HOUR;
 const YEAR = 365 * DAY;
 const MONTH = YEAR / 12;
 
-/**
- * get readable string of time elapsed since date
- * @param {Date} date
- * @returns string
- */
-export default function timeElapsed(date: Date) {
+export default function timeElapsed(date: Date): string {
 	const now = new Date();
 	const age = Math.floor((now.getTime() - date.getTime()) / 1000);