Remove unsound null safety options from classes ModuleMetadata and MetadataProvider

Author: jyameo

dwds/lib/src/debugging/metadata/module_metadata.dart

@@ -114,8 +114,8 @@ class ModuleMetadata {
   /// Module uri
   final String moduleUri;
 
-  /// True if the module corresponding to this metadata was compiled with sound
-  /// null safety enabled.
+  // Keep the soundNullSafety flag for backward compatibility
+  @Deprecated('This field is deprecated as sound null safety is enforced.')
   final bool soundNullSafety;
 
   final Map<String, LibraryMetadata> libraries = {};
@@ -124,8 +124,8 @@ class ModuleMetadata {
     this.name,
     this.closureName,
     this.sourceMapUri,
-    this.moduleUri,
-    this.soundNullSafety, {
+    this.moduleUri, {
+    this.soundNullSafety = true, // Default to true
     String? ver,
   }) {
     version = ver ?? ModuleMetadataVersion.current.version;
@@ -152,7 +152,9 @@ class ModuleMetadata {
         closureName = _readRequiredField(json, 'closureName'),
         sourceMapUri = _readRequiredField(json, 'sourceMapUri'),
         moduleUri = _readRequiredField(json, 'moduleUri'),
-        soundNullSafety = _readOptionalField(json, 'soundNullSafety') ?? false {
+        // Deprecated field still present for backward compatibility
+        // Defaults to true if missing
+        soundNullSafety = _readOptionalField(json, 'soundNullSafety') ?? true {
     if (!ModuleMetadataVersion.current.isCompatibleWith(version) &&
         !ModuleMetadataVersion.previous.isCompatibleWith(version)) {
       throw Exception('Unsupported metadata version $version. '
@@ -174,7 +176,6 @@ class ModuleMetadata {
       'sourceMapUri': sourceMapUri,
       'moduleUri': moduleUri,
       'libraries': [for (final lib in libraries.values) lib.toJson()],
-      'soundNullSafety': soundNullSafety,
     };
   }
 }

dwds/lib/src/debugging/metadata/provider.dart

@@ -15,7 +15,8 @@ class MetadataProvider {
   final AssetReader _assetReader;
   final _logger = Logger('MetadataProvider');
   final String entrypoint;
-  bool _soundNullSafety;
+  @Deprecated('This field is deprecated as sound null safety is enforced.')
+  final bool _soundNullSafety = true;
   final List<String> _libraries = [];
   final Map<String, String> _scriptToModule = {};
   final Map<String, String> _moduleToSourceMap = {};
@@ -65,8 +66,7 @@ class MetadataProvider {
         'dart:ui',
       ];
 
-  MetadataProvider(this.entrypoint, this._assetReader)
-      : _soundNullSafety = false;
+  MetadataProvider(this.entrypoint, this._assetReader);
 
   /// A sound null safety mode for the whole app.
   ///
@@ -178,8 +178,6 @@ class MetadataProvider {
 
   Future<void> _initialize() async {
     await _metadataMemoizer.runOnce(() async {
-      var hasSoundNullSafety = true;
-      var hasUnsoundNullSafety = true;
       // The merged metadata resides next to the entrypoint.
       // Assume that <name>.bootstrap.js has <name>.ddc_merged_metadata
       if (entrypoint.endsWith('.bootstrap.js')) {
@@ -199,22 +197,14 @@ class MetadataProvider {
               final metadata =
                   ModuleMetadata.fromJson(moduleJson as Map<String, dynamic>);
               _addMetadata(metadata);
-              hasUnsoundNullSafety &= !metadata.soundNullSafety;
-              hasSoundNullSafety &= metadata.soundNullSafety;
               _logger
                   .fine('Loaded debug metadata for module: ${metadata.name}');
             } catch (e) {
               _logger.warning('Failed to read metadata: $e');
               rethrow;
             }
           }
-          if (!hasSoundNullSafety && !hasUnsoundNullSafety) {
-            throw Exception('Metadata contains modules with mixed null safety');
-          }
-          _soundNullSafety = hasSoundNullSafety;
         }
-        _logger.info('Loaded debug metadata '
-            '(${_soundNullSafety ? "sound" : "weak"} null safety)');
       }
     });
   }

dwds/test/metadata_test.dart

@@ -69,7 +69,7 @@ void main() {
       await provider.libraries,
       contains('org-dartlang-app:///web/main.dart'),
     );
-    expect(await provider.soundNullSafety, false);
+    expect(await provider.soundNullSafety, true);
   });
 
   test('throws on metadata with absolute import uris', () async {
@@ -114,6 +114,6 @@ void main() {
       expect(parts.length, 1);
       expect(parts[0], 'org-dartlang-app:///web/main.dart');
     }
-    expect(metadata.soundNullSafety, false);
+    expect(metadata.soundNullSafety, true);
   });
 }