updated all functions to use the "const fn = () => {}" syntax

src/domUtils.ts

@@ -1,10 +1,10 @@
-export function addGlobalEventListener(
+export const addGlobalEventListener = (
     type: string,
     selector: string,
     callback: (arg0: Event) => void,
     options: boolean | AddEventListenerOptions,
     parent = document
-): void {
+): void => {
   parent.addEventListener(
       type,
       e => {
@@ -15,10 +15,10 @@ export function addGlobalEventListener(
   )
 }
 
-export function qs(selector: string, parent = document): Element {
+export const qs = (selector: string, parent = document): Element => {
   return parent.querySelector(selector)
 }
 
-export function qsa(selector: string, parent = document): Element[] {
+export const qsa = (selector: string, parent = document): Element[] => {
   return [...parent.querySelectorAll(selector)]
 }

src/formatters.ts

@@ -1,20 +1,30 @@
-const CURRENCY_FORMATTER = new Intl.NumberFormat(undefined, {
-  currency: "EUR",
-  style: "currency",
-})
-export function formatCurrency (number: number): string {
+export const formatCurrency =  (
+    number: number,
+    currency: string,
+    locale: string | undefined = undefined
+): string => {
+  const CURRENCY_FORMATTER = new Intl.NumberFormat(locale, {
+    currency: currency,
+    style: "currency",
+  })
   return CURRENCY_FORMATTER.format(number)
 }
 
-const NUMBER_FORMATTER = new Intl.NumberFormat(undefined)
-export function formatNumber (number: number): string {
+export const formatNumber =  (
+    number: number,
+    locale: string | undefined = undefined
+): string => {
+  const NUMBER_FORMATTER = new Intl.NumberFormat(locale)
   return NUMBER_FORMATTER.format(number)
 }
 
-const COMPACT_NUMBER_FORMATTER = new Intl.NumberFormat(undefined, {
-  notation: "compact"
-})
-export function formatCompactNumber (number: number): string {
+export const formatCompactNumber =  (
+    number: number,
+    locale: string | undefined = undefined
+): string => {
+  const COMPACT_NUMBER_FORMATTER = new Intl.NumberFormat(locale, {
+    notation: "compact"
+  })
   return COMPACT_NUMBER_FORMATTER.format(number)
 }
 
@@ -30,7 +40,7 @@ type DivisionsT = {
       "minute" | "minutes" |
       "second" | "seconds"
 }
-const DIVISTIONS: DivisionsT[] = [
+const DIVISIONS: DivisionsT[] = [
   { amount: 60, name: "seconds" },
   { amount: 60, name: "minutes" },
   { amount: 24, name: "hours" },
@@ -39,14 +49,18 @@ const DIVISTIONS: DivisionsT[] = [
   { amount: 12, name: "months" },
   { amount: Number.POSITIVE_INFINITY, name: "years" },
 ]
-const RELATIVE_DATE_FORMATTER = new Intl.RelativeTimeFormat(undefined, {
-  numeric: "auto"
-})
-export function formatRelativeDate(toDate: Date, fromDate: Date = new Date()) {
-  let duration = (toDate.getSeconds() - fromDate.getSeconds()) / 1000
+export const formatRelativeDate = (
+    toDate: number,
+    fromDate: number = new Date().getSeconds(),
+    locale: string | undefined = undefined
+): string => {
+  const RELATIVE_DATE_FORMATTER = new Intl.RelativeTimeFormat(locale, {
+    numeric: "auto"
+  })
+  let duration = (toDate - fromDate) / 1000
   
-  for (let i = 0; i <= DIVISTIONS.length; i++) {
-    const division = DIVISTIONS[i]
+  for (let i = 0; i <= DIVISIONS.length; i++) {
+    const division = DIVISIONS[i]
     if (Math.abs(duration) < division.amount) {
       return RELATIVE_DATE_FORMATTER.format(Math.round(duration), division.name)
     }

src/index.ts

@@ -1,3 +1,3 @@
-export * from "./utils"
-export * from "./domUtils"
-export * from "./formatters"
+export * from "./utils.js"
+export * from "./domUtils.js"
+export * from "./formatters.js"

src/utils.ts

@@ -1,3 +1,3 @@
-export function sleep (time: number): Promise<unknown> {
+export const sleep =  (time: number): Promise<unknown> => {
   return new Promise((resolve => setTimeout(resolve, time)))
 }