diff --git a/util.js b/util.js
index 0b613af..0ee71a3 100644
--- a/util.js
+++ b/util.js
@@ -20,10 +20,10 @@ export const noop = () => {}
 
 export const delay = (n = 550) => new Promise(resolve => setTimeout(resolve, n))
 
-export const isObject = obj => Object.prototype.toString.call(obj) === '[object Object]'
+export const isObject = obj => { return Object.prototype.toString.call(obj) === '[object Object]' }
 
-export const convertToDuration = (milliseconds: number) => {
-  const stringifyTime = (time: number): string => String(time).padStart(2, '0')
+export const convertToDuration = (milliseconds) => {
+  const stringifyTime = (time) => String(time).padStart(2, '0')
   const seconds = Math.floor(milliseconds / 1000)
   const minutes = Math.floor(seconds / 60)
   const hours = Math.floor(minutes / 60)
@@ -32,7 +32,7 @@ export const convertToDuration = (milliseconds: number) => {
   )}:${stringifyTime(seconds % 60)}`
 }
 
-export const convertToTimeWorked = (milliseconds: number) => {
+export const convertToTimeWorked = (milliseconds) => {
   const seconds = Math.floor(milliseconds / 1000)
   const minutes = Math.floor(seconds / 60)
   const hours = Math.floor(minutes / 60)