feat: Add isRouteActive() function

src/lib/index.test.ts

@@ -17,6 +17,7 @@ describe('index', () => {
             'initFull',
             'getRouterContext',
             'setRouterContext',
+            'isRouteActive',
         ];
 
         // Act.

src/lib/index.ts

@@ -12,3 +12,4 @@ export type * from "./types.js";
 export { location } from "./core/Location.js";
 export * from './RouterTrace/RouterTrace.svelte';
 export { default as RouterTrace } from './RouterTrace/RouterTrace.svelte';
+export * from "./public-utils.js";

src/lib/public-utils.ts

@@ -0,0 +1,18 @@
+import { RouterEngine } from "./core/RouterEngine.svelte.js";
+import type { RouteStatus } from "./types.js";
+
+/**
+ * Checks if a specific route is active according to the provided router engine or route status record.
+ *
+ * **Note:** `false` is also returned if no router engine is provided or if no route key is specified.
+ * @param rsOrRouter A router engine or a router engine's route status record.
+ * @param key The route key to check for activity.
+ * @returns `true` if the specified route is active; otherwise, `false`.
+ */
+export function isRouteActive(
+    rsOrRouter: RouterEngine | Record<string, RouteStatus> | null | undefined,
+    key: string | null | undefined
+): boolean {
+    const rs = rsOrRouter instanceof RouterEngine ? rsOrRouter.routeStatus : rsOrRouter;
+    return !!rs?.[key ?? '']?.match;
+}