urlTunneler can be null (#1700)

Author: elliette

frontend_server_common/lib/src/asset_server.dart

@@ -63,7 +63,7 @@ class TestAssetServer implements AssetReader {
     String index,
     String hostname,
     int port,
-    UrlEncoder urlTunneller,
+    UrlEncoder? urlTunneler,
     PackageConfig packageConfig,
   ) async {
     var address = (await InternetAddress.lookup(hostname)).first;

frontend_server_common/lib/src/devfs.dart

@@ -26,8 +26,8 @@ class WebDevFS {
     required this.projectDirectory,
     required this.packageConfigFile,
     required this.index,
-    required this.urlTunneller,
     required this.soundNullSafety,
+    this.urlTunneler,
   });
 
   final FileSystem fileSystem;
@@ -37,7 +37,7 @@ class WebDevFS {
   final Uri projectDirectory;
   final Uri packageConfigFile;
   final String index;
-  final UrlEncoder urlTunneller;
+  final UrlEncoder? urlTunneler;
   final bool soundNullSafety;
   late final Directory _savedCurrentDirectory;
   late final PackageConfig _packageConfig;
@@ -51,7 +51,7 @@ class WebDevFS {
         loader: (Uri uri) => fileSystem.file(uri).readAsBytes());
 
     assetServer = await TestAssetServer.start(
-        fileSystem, index, hostname, port, urlTunneller, _packageConfig);
+        fileSystem, index, hostname, port, urlTunneler, _packageConfig);
     return Uri.parse('http://$hostname:$port');
   }
 

frontend_server_common/lib/src/resident_runner.dart

@@ -26,7 +26,7 @@ class ResidentWebRunner {
 
   ResidentWebRunner(
       this.mainUri,
-      this.urlTunneller,
+      this.urlTunneler,
       this.projectDirectory,
       this.packageConfigFile,
       this.fileSystemRoots,
@@ -47,7 +47,7 @@ class ResidentWebRunner {
     expressionCompiler = TestExpressionCompiler(generator);
   }
 
-  final UrlEncoder urlTunneller;
+  final UrlEncoder? urlTunneler;
   final Uri mainUri;
   final Uri projectDirectory;
   final Uri packageConfigFile;
@@ -70,7 +70,7 @@ class ResidentWebRunner {
       projectDirectory: projectDirectory,
       packageConfigFile: packageConfigFile,
       index: index,
-      urlTunneller: urlTunneller,
+      urlTunneler: urlTunneler,
       soundNullSafety: soundNullSafety,
     );
     uri = await devFS.create();