diff --git a/assets/ts/desktop.ts b/assets/ts/desktop.ts
index 097c13b..89baf45 100644
--- a/assets/ts/desktop.ts
+++ b/assets/ts/desktop.ts
@@ -87,7 +87,7 @@ async function enterOverlay(): Promise<void> {
 }
 
 // initialization
-export function trackMouseInit(): void {
+export const trackMouseInit = (): void => {
   window.addEventListener('mousemove', handleOnMove)
   layers[4].addEventListener(
     'click',
@@ -100,12 +100,12 @@ export function trackMouseInit(): void {
   )
 }
 
-export function globalIndexDec(): void {
+export const globalIndexDec = (): void => {
   globalIndex--
   preloader(globalIndex)
 }
 
-export function globalIndexInc(): void {
+export const globalIndexInc = (): void => {
   globalIndex++
   preloader(globalIndex)
 }
diff --git a/assets/ts/imageCache.ts b/assets/ts/imageCache.ts
index b30438f..feaa88d 100644
--- a/assets/ts/imageCache.ts
+++ b/assets/ts/imageCache.ts
@@ -3,7 +3,7 @@ import { preloadImage, calcImageIndex } from './utils'
 
 let lastIndex: number = 0
 
-export function preloader(index: number): void {
+export const preloader = (index: number): void => {
   if (lastIndex === index) {
     for (let i: number = -2; i <= 1; i++)
       preloadImage(imagesArray[calcImageIndex(index + i, imagesArrayLen)].url)
diff --git a/assets/ts/indexDisp.ts b/assets/ts/indexDisp.ts
index 0ef49f9..e772230 100644
--- a/assets/ts/indexDisp.ts
+++ b/assets/ts/indexDisp.ts
@@ -1,7 +1,7 @@
 import { duper } from './utils'
 
 // update index of displaying image
-export function imgIndexSpanUpdate(numOne: number, numTwo: number): void {
+export const imgIndexSpanUpdate = (numOne: number, numTwo: number): void => {
   // footer index number display module
   const footerIndexDisp = document.getElementsByClassName('ftid')
   const numOneString: string = duper(numOne)
diff --git a/assets/ts/main.ts b/assets/ts/main.ts
index b58ef0e..08cba8d 100644
--- a/assets/ts/main.ts
+++ b/assets/ts/main.ts
@@ -6,7 +6,7 @@ import { vwRefreshInit } from './overlay'
 import { preloader } from './imageCache'
 import { getDeviceType } from './utils'
 
-function desktopInit(): void {
+const desktopInit = (): void => {
   preloader(0)
   vwRefreshInit()
   imgIndexSpanUpdate(0, imagesArrayLen)
@@ -14,7 +14,7 @@ function desktopInit(): void {
   trackMouseInit()
 }
 
-function mobileInit(): void {
+const mobileInit = (): void => {
   console.log('mobile')
 }
 
diff --git a/assets/ts/overlay.ts b/assets/ts/overlay.ts
index 5bcb64c..f60eacc 100644
--- a/assets/ts/overlay.ts
+++ b/assets/ts/overlay.ts
@@ -28,7 +28,7 @@ const cursor = document
   .item(0) as HTMLDivElement
 
 // set cursor text
-function setCursorText(text: string): void {
+const setCursorText = (text: string): void => {
   cursor.innerText = text
 }
 
@@ -39,7 +39,7 @@ const overlayCursor = (e: MouseEvent): void => {
 }
 
 // disable listeners
-function disableListener(): void {
+const disableListener = (): void => {
   window.removeEventListener('mousemove', overlayCursor)
   closeSection = removeAllEventListeners(closeSection)
   prevSection = removeAllEventListeners(prevSection)
@@ -47,13 +47,13 @@ function disableListener(): void {
 }
 
 // enable overlay
-export function overlayEnable(): void {
+export const overlayEnable = (): void => {
   overlay.style.zIndex = '7'
   setListener()
 }
 
 // disable overlay
-export function overlayDisable(): void {
+export const overlayDisable = (): void => {
   overlay.style.zIndex = '-1'
   setCursorText('')
   disableListener()
@@ -76,14 +76,14 @@ async function handleCloseClick(): Promise<void> {
   window.addEventListener('mousemove', handleOnMove)
 }
 
-function handlePrevClick(): void {
+const handlePrevClick = (): void => {
   globalIndexDec()
   const imgIndex = calcImageIndex(globalIndex, imagesArrayLen)
   FIFO(createImgElement(imagesArray[imgIndex], false).image, layers)
   imgIndexSpanUpdate(imgIndex + 1, imagesArrayLen)
 }
 
-function handleNextClick(): void {
+const handleNextClick = (): void => {
   globalIndexInc()
   const imgIndex = calcImageIndex(globalIndex, imagesArrayLen)
   FIFO(createImgElement(imagesArray[imgIndex], false).image, layers)
@@ -91,7 +91,7 @@ function handleNextClick(): void {
 }
 
 // set event listener
-function setListener(): void {
+const setListener = (): void => {
   window.addEventListener('mousemove', overlayCursor, { passive: true })
   closeSection.addEventListener(
     'mouseover',
@@ -137,7 +137,7 @@ function setListener(): void {
   )
 }
 
-export function vwRefreshInit(): void {
+export const vwRefreshInit = (): void => {
   window.addEventListener(
     'resize',
     () => {
diff --git a/assets/ts/thresholdCtl.ts b/assets/ts/thresholdCtl.ts
index 3ab9999..086ed12 100644
--- a/assets/ts/thresholdCtl.ts
+++ b/assets/ts/thresholdCtl.ts
@@ -9,12 +9,12 @@ export const thresholdSensitivityArray: number[] = [100, 40, 18, 14, 9, 5]
 export let thresholdIndex: number = 2
 
 // update inner text of threshold display element
-function thresholdUpdate(): void {
+const thresholdUpdate = (): void => {
   thresholdDisp.innerText = duper(threshold[thresholdIndex])
 }
 
 // threshold control initialization
-export function thresholdCtlInit(): void {
+export const thresholdCtlInit = (): void => {
   thresholdUpdate()
   const dec = document.getElementById('thresholdDec') as HTMLButtonElement
   dec.addEventListener(