fixed some type errors

src/lib/helper/shortenFileSize.ts

@@ -7,7 +7,7 @@ const GIGA = MEGA * KILO;
  * @param {number} size
  * @returns{string}
  */
-export default function shortenFileSize(size) {
+export default function shortenFileSize(size: number) {
 	const giga = Math.floor(size / GIGA);
 	let remainder = size % GIGA;
 	const mega = Math.floor(remainder / MEGA);