feat: add find method to abstract tree service

npm/ng-packs/packages/core/src/lib/services/routes.service.ts

@@ -77,6 +77,13 @@ export abstract class AbstractTreeService<T extends object> {
     return this.publish(flatItems, visibleItems);
   }
 
+  find(predicate: (item: TreeNode<T>) => boolean, tree = this.tree) {
+    return tree.reduce(
+      (acc, node) => (acc ? acc : predicate(node) ? node : this.find(predicate, node.children)),
+      null,
+    );
+  }
+
   patch(identifier: string, props: Partial<T>): T[] | false {
     const flatItems = this._flat$.value;
     const index = flatItems.findIndex(item => item[this.id] === identifier);

npm/ng-packs/packages/core/src/lib/tests/routes.service.spec.ts

@@ -52,6 +52,22 @@ describe('Routes Service', () => {
     });
   });
 
+  describe('#find', () => {
+    it('should return node found based on query', () => {
+      service.add(routes);
+      const result = service.find(route => route.invisible);
+      expect(result.name).toBe('bar');
+      expect(result.children.length).toBe(1);
+      expect(result.children[0].name).toBe('baz');
+    });
+
+    it('should return null when query is not found', () => {
+      service.add(routes);
+      const result = service.find(route => route.requiredPolicy === 'X');
+      expect(result).toBe(null);
+    });
+  });
+
   describe('#remove', () => {
     it('should remove routes based on given routeNames', () => {
       service.add(routes);