first commit

resources/js/lib/currentUrl.svelte.ts

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+import type { LinkComponentBaseProps } from '@inertiajs/core';
+import { page } from '@inertiajs/svelte';
+import { toUrl } from '@/lib/utils';
+
+export type CurrentUrlState = {
+    readonly currentUrl: string;
+    isCurrentUrl: (
+        urlToCheck: NonNullable<LinkComponentBaseProps['href']>,
+        currentUrl: string,
+    ) => boolean;
+    isCurrentOrParentUrl: (
+        urlToCheck: NonNullable<LinkComponentBaseProps['href']>,
+        currentUrl: string,
+    ) => boolean;
+    whenCurrentUrl: <TIfTrue, TIfFalse>(
+        urlToCheck: NonNullable<LinkComponentBaseProps['href']>,
+        currentUrl: string,
+        ifTrue: TIfTrue,
+        ifFalse: TIfFalse,
+    ) => TIfTrue | TIfFalse;
+};
+
+export function currentUrlState(): CurrentUrlState {
+    const currentUrl = $derived.by(() => {
+        const origin =
+            typeof window === 'undefined'
+                ? 'http://localhost'
+                : window.location.origin;
+
+        try {
+            return new URL(page.url, origin).pathname;
+        } catch {
+            return page.url;
+        }
+    });
+
+    function isCurrentUrl(
+        urlToCheck: NonNullable<LinkComponentBaseProps['href']>,
+        current: string,
+    ): boolean {
+        const resolved = toUrl(urlToCheck);
+
+        if (typeof resolved !== 'string') {
+            return false;
+        }
+
+        return current === resolved;
+    }
+
+    function isCurrentOrParentUrl(
+        urlToCheck: NonNullable<LinkComponentBaseProps['href']>,
+        current: string,
+    ): boolean {
+        const resolved = toUrl(urlToCheck);
+
+        if (typeof resolved !== 'string') {
+            return false;
+        }
+
+        return current.startsWith(resolved);
+    }
+
+    function whenCurrentUrl<TIfTrue, TIfFalse>(
+        urlToCheck: NonNullable<LinkComponentBaseProps['href']>,
+        current: string,
+        ifTrue: TIfTrue,
+        ifFalse: TIfFalse,
+    ): TIfTrue | TIfFalse {
+        return isCurrentUrl(urlToCheck, current) ? ifTrue : ifFalse;
+    }
+
+    return {
+        get currentUrl() {
+            return currentUrl;
+        },
+        isCurrentUrl,
+        isCurrentOrParentUrl,
+        whenCurrentUrl,
+    };
+}