Add initial Code

resources/js/lib/utils.ts

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+import { InertiaLinkProps } from '@inertiajs/vue3';
+import { clsx, type ClassValue } from 'clsx';
+import { twMerge } from 'tailwind-merge';
+
+export function cn(...inputs: ClassValue[]) {
+    return twMerge(clsx(inputs));
+}
+
+export function urlIsActive(urlToCheck: NonNullable<InertiaLinkProps['href']>, currentUrl: string) {
+    return toUrl(urlToCheck) === currentUrl;
+}
+
+export function toUrl(href: NonNullable<InertiaLinkProps['href']>) {
+    return typeof href === 'string' ? href : href?.url;
+}
+
+const currencyFormatter = new Intl.NumberFormat('de-DE', {
+    style: 'currency',
+    currency: 'EUR',
+    minimumFractionDigits: 2,
+})
+
+export function toCurrency(value: number | undefined) {
+    if (!value) return currencyFormatter.format(0);
+    return currencyFormatter.format(value);
+}
+
+export function toLocalDate(value: string) {
+    const date = new Date(value);
+    return date.toLocaleDateString('de-DE', { day: '2-digit', month: 'short', year: 'numeric' });
+    // return date.toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric'  });
+    // return date.toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: '2-digit'  });
+}
+
+export function toShortISOString(date: Date | string) {
+    let tempDate = (typeof date === 'string') ? new Date(date) : date
+    return tempDate.toISOString().split('T')[0]
+}
+
+export function calcDueDate(date: Date, daysAfterInvoice: number): Date {
+    let dueDate = new Date(date);
+    dueDate.setDate(date.getDate() + daysAfterInvoice);
+    return dueDate;
+}
+
+export function randomInt(max: number) {
+    return Math.floor(Math.random() * max);
+}
+
+const randomColors = [
+    'bg-rose-200 dark:bg-rose-700',
+    'bg-lime-200 dark:bg-lime-700',
+    'bg-orange-200 dark:bg-orange-700',
+    'bg-sky-200 dark:bg-sky-700',
+    'bg-amber-200 dark:bg-amber-700',
+    'bg-blue-200 dark:bg-blue-700',
+    'bg-purple-200 dark:bg-purple-700'
+]
+
+export function bgColorForString(input: string): string {
+    let charCodeSum = 0;
+    for (let i = 0; i < input.length; i++) {
+        charCodeSum += input.charCodeAt(i)
+    }
+    return randomColors[charCodeSum % randomColors.length];
+}