Support compiling with weak null-safety with the Frontend Server

dwds/test/utils/version_compatibility.dart

@@ -13,8 +13,10 @@ bool supportedMode(
     required NullSafety nullSafetyMode}) {
   final isDart3 = Version.parse(Platform.version.split(' ')[0]).major == 3;
   // TODO(https://github.com/dart-lang/webdev/issues/1818): Support compiling to
-  // to weak null-safety for both FrontendServer and BuildDaemon.
-  if (isDart3 && nullSafetyMode == NullSafety.weak) {
+  // weak null-safety for BuildDaemon.
+  if (isDart3 &&
+      compilationMode == CompilationMode.buildDaemon &&
+      nullSafetyMode == NullSafety.weak) {
     return false;
   }
   // TODO(https://github.com/dart-lang/webdev/issues/1591): Support compiling to

fixtures/_test/pubspec.yaml

@@ -9,10 +9,10 @@ description: >-
 publish_to: none
 
 environment:
-  sdk: ">=2.5.0 <3.0.0"
+  sdk: ">=2.18.0 <3.0.0"
 
 dependencies:
-  intl: ^0.16.0
+  intl: ^0.18.0
   path: ^1.6.1
 
 dev_dependencies:

fixtures/_testCircular1/pubspec.yaml

@@ -9,10 +9,10 @@ description: >-
 publish_to: none
 
 environment:
-  sdk: ">=2.5.0 <3.0.0"
+  sdk: ">=2.18.0 <3.0.0"
 
 dependencies:
-  intl: ^0.16.0
+  intl: ^0.18.0
   path: ^1.6.1
   _test_circular2:
     path: ../_testCircular2

fixtures/_testCircular1Sound/pubspec.yaml

@@ -5,10 +5,10 @@ description: >-
 publish_to: none
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.18.0 <3.0.0'
 
 dependencies:
-  intl: ^0.17.0
+  intl: ^0.18.0
   path: ^1.6.1
   _test_circular2_sound:
     path: ../_testCircular2Sound

fixtures/_testCircular2/pubspec.yaml

@@ -9,7 +9,7 @@ description: >-
 publish_to: none
 
 environment:
-  sdk: ">=2.10.0 <3.0.0"
+  sdk: ">=2.18.0 <3.0.0"
 
 dependencies:
   _test_circular1:

fixtures/_testCircular2Sound/pubspec.yaml

@@ -5,7 +5,7 @@ description: >-
 publish_to: none
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.18.0 <3.0.0'
 
 dependencies:
   _test_circular1_sound:

fixtures/_testPackage/pubspec.yaml

@@ -9,7 +9,7 @@ description: >-
 publish_to: none
 
 environment:
-  sdk: ">=2.10.0 <3.0.0"
+  sdk: ">=2.18.0 <3.0.0"
 
 dependencies:
   _test:

fixtures/_testPackageSound/pubspec.yaml

@@ -5,7 +5,7 @@ description: >-
 publish_to: none
 
 environment:
-  sdk: '>=2.13.0 <3.0.0'
+  sdk: '>=2.18.0 <3.0.0'
 
 dependencies:
   _test_sound:

fixtures/_testSound/pubspec.yaml

@@ -5,10 +5,10 @@ description: >-
 publish_to: none
 
 environment:
-  sdk: '>=2.13.0 <3.0.0'
+  sdk: '>=2.18.0 <3.0.0'
 
 dependencies:
-  intl: ^0.17.0
+  intl: ^0.18.0
   path: ^1.8.2
 
 dev_dependencies:

frontend_server_common/lib/src/frontend_server_client.dart

@@ -259,6 +259,7 @@ class ResidentCompiler {
     required this.fileSystemRoots,
     required this.fileSystemScheme,
     required this.platformDill,
+    required this.soundNullSafety,
     this.verbose = false,
     CompilerMessageConsumer compilerMessageConsumer = defaultConsumer,
   }) : _stdoutHandler = StdoutHandler(consumer: compilerMessageConsumer);
@@ -269,6 +270,7 @@ class ResidentCompiler {
   final List<Uri> fileSystemRoots;
   final String fileSystemScheme;
   final String platformDill;
+  final bool soundNullSafety;
   final bool verbose;
 
   /// The path to the root of the Dart SDK used to compile.
@@ -386,6 +388,7 @@ class ResidentCompiler {
       ],
       if (useDebuggerModuleNames) '--debugger-module-names',
       '--experimental-emit-debug-metadata',
+      '--${soundNullSafety ? '' : 'no-'}sound-null-safety',
       if (verbose) '--verbose'
     ];
 

frontend_server_common/lib/src/resident_runner.dart

@@ -45,6 +45,7 @@ class ResidentWebRunner {
           soundNullSafety ? '$platformDillSound' : '$platformDillUnsound',
       fileSystemRoots: fileSystemRoots,
       fileSystemScheme: fileSystemScheme,
+      soundNullSafety: soundNullSafety,
       verbose: verbose,
     );
     expressionCompiler = TestExpressionCompiler(generator);