Convert functions to arrow functions

javascript/src/utilities/stringUtilities.js

-export function stringToUtf8ByteArray(str) {
+export const stringToUtf8ByteArray = (str) => {
   if (typeof str !== 'string') {
     str = str.toString();
   }
@@ -6,7 +6,7 @@ export function stringToUtf8ByteArray(str) {
   return res;
 }
 
-export function utf8ByteArrayToString(ba) {
+export const utf8ByteArrayToString = (ba) => {
   if (!Buffer.isBuffer(ba)) {
     ba = Buffer.from(ba);
   }
@@ -14,7 +14,7 @@ export function utf8ByteArrayToString(ba) {
   return res;
 }
 
-export function stringToUtf8Base64(str) {
+export const stringToUtf8Base64 = (str) => {
   if (!Buffer.isBuffer(str)) {
     if (typeof str !== 'string') {
       str = str.toString();
@@ -25,7 +25,7 @@ export function stringToUtf8Base64(str) {
   return res;
 }
 
-export function utf8Base64ToString(strBase64) {
+export const utf8Base64ToString = (strBase64) => {
   if (!Buffer.isBuffer(strBase64)) {
     if (typeof strBase64 !== 'string') {
       strBase64 = strBase64.toString();
@@ -36,7 +36,7 @@ export function utf8Base64ToString(strBase64) {
   return res;
 }
 
-export function base64ToByteArray(strBase64) {
+export const base64ToByteArray = (strBase64) => {
   if (typeof strBase64 !== 'string') {
     strBase64 = strBase64.toString();
   }
@@ -44,7 +44,7 @@ export function base64ToByteArray(strBase64) {
   return res;
 }
 
-export function byteArrayToBase64(ba) {
+export const byteArrayToBase64 = (ba) => {
   if (!Buffer.isBuffer(ba)) {
     ba = Buffer.from(ba);
   }