moved constructUri to utils.dart

package/lib/src/beamer.dart

@@ -1,11 +1,10 @@
 import 'package:beamer/beamer.dart';
+import 'package:beamer/src/utils.dart';
 import 'package:flutter/widgets.dart';
 
 import 'package:beamer/src/path_url_strategy_nonweb.dart'
     if (dart.library.html) 'path_url_strategy_web.dart' as url_strategy;
 
-part 'path_url_query_parameters.dart';
-
 /// Represents a navigation area and is a wrapper for [Router].
 ///
 /// This is most commonly used for "nested navigation", e.g. in a tabbed view.

package/lib/src/utils.dart

@@ -309,3 +309,21 @@ extension BeamerRouteInformationExtension on RouteInformation {
     return location == other.location && state == other.state;
   }
 }
+
+/// Returns the provided `String uri` with the constructed `Map<String, dynamic>? queryParameters`
+///
+/// If `Map<String, dynamic>? queryParameters` is provided, `String uri` should not containt query parameters.
+///
+/// When `queryParameters` is used the query is built from the provided map.
+/// Each key and value in the map is percent-encoded and joined using equal and ampersand characters.
+/// A value in the map must be either a `String`, or an `Iterable<String>`, where the latter corresponds to multiple values for the same key.
+String constructUri(String uri, Map<String, dynamic>? queryParameters) {
+  final _inputQueryParameters = Uri.parse(uri).queryParameters;
+  assert(_inputQueryParameters.isEmpty || (queryParameters?.isEmpty ?? true),
+      'Avoid passing an uri that already contains query Parameters and a non-empty `queryParameters`');
+
+  if (queryParameters?.isEmpty ?? true) return uri;
+  if (_inputQueryParameters.isNotEmpty) return uri;
+
+  return uri + '?' + Uri(queryParameters: queryParameters).query;
+}

package/test/path_url_query_parameters_test.dart

@@ -1,4 +1,4 @@
-import 'package:beamer/beamer.dart';
+import 'package:beamer/src/utils.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {