Change some required nullable parameters in tool to non-null (#114115)

packages/flutter_tools/lib/src/commands/precache.dart

@@ -14,7 +14,7 @@ import '../runner/flutter_command.dart';
 class PrecacheCommand extends FlutterCommand {
   PrecacheCommand({
     bool verboseHelp = false,
-    required Cache? cache,
+    required Cache cache,
     required Platform platform,
     required Logger logger,
     required FeatureFlags featureFlags,
@@ -58,7 +58,7 @@ class PrecacheCommand extends FlutterCommand {
         help: 'Precache the unsigned macOS binaries when available.', hide: !verboseHelp);
   }
 
-  final Cache? _cache;
+  final Cache _cache;
   final Logger _logger;
   final Platform _platform;
   final FeatureFlags _featureFlags;
@@ -133,21 +133,21 @@ class PrecacheCommand extends FlutterCommand {
   Future<FlutterCommandResult> runCommand() async {
     // Re-lock the cache.
     if (_platform.environment['FLUTTER_ALREADY_LOCKED'] != 'true') {
-      await _cache!.lock();
+      await _cache.lock();
     }
     if (boolArgDeprecated('force')) {
-      _cache!.clearStampFiles();
+      _cache.clearStampFiles();
     }
 
     final bool includeAllPlatforms = boolArgDeprecated('all-platforms');
     if (includeAllPlatforms) {
-      _cache!.includeAllPlatforms = true;
+      _cache.includeAllPlatforms = true;
     }
     if (boolArgDeprecated('use-unsigned-mac-binaries')) {
-      _cache!.useUnsignedMacBinaries = true;
+      _cache.useUnsignedMacBinaries = true;
     }
     final Set<String> explicitlyEnabled = _explicitArtifactSelections();
-    _cache!.platformOverrideArtifacts = explicitlyEnabled;
+    _cache.platformOverrideArtifacts = explicitlyEnabled;
 
     // If the user did not provide any artifact flags, then download
     // all artifacts that correspond to an enabled platform.
@@ -164,8 +164,8 @@ class PrecacheCommand extends FlutterCommand {
         requiredArtifacts.add(artifact);
       }
     }
-    if (!await _cache!.isUpToDate()) {
-      await _cache!.updateAll(requiredArtifacts);
+    if (!await _cache.isUpToDate()) {
+      await _cache.updateAll(requiredArtifacts);
     } else {
       _logger.printStatus('Already up-to-date.');
     }

packages/flutter_tools/lib/src/ios/code_signing.dart

@@ -97,17 +97,13 @@ final RegExp _certificateOrganizationalUnitExtractionPattern = RegExp(r'OU=([a-z
 /// Will return null if none are found, if the user cancels or if the Xcode
 /// project has a development team set in the project's build settings.
 Future<Map<String, String>?> getCodeSigningIdentityDevelopmentTeamBuildSetting({
-  required Map<String, String>? buildSettings,
+  required Map<String, String> buildSettings,
   required ProcessManager processManager,
   required Platform platform,
   required Logger logger,
   required Config config,
   required Terminal terminal,
 }) async {
-  if (buildSettings == null) {
-    return null;
-  }
-
   // If the user already has it set in the project build settings itself,
   // continue with that.
   if (_isNotEmpty(buildSettings[_developmentTeamBuildSettingName])) {

packages/flutter_tools/lib/src/isolated/devfs_web.dart

@@ -83,11 +83,11 @@ const String _kDefaultIndex = '''
 /// This is only used in development mode.
 class WebExpressionCompiler implements ExpressionCompiler {
   WebExpressionCompiler(this._generator, {
-    required FileSystem? fileSystem,
+    required FileSystem fileSystem,
   }) : _fileSystem = fileSystem;
 
   final ResidentCompiler _generator;
-  final FileSystem? _fileSystem;
+  final FileSystem _fileSystem;
 
   @override
   Future<ExpressionCompilationResult> compileExpressionToJs(
@@ -106,7 +106,7 @@ class WebExpressionCompiler implements ExpressionCompiler {
 
     if (compilerOutput != null && compilerOutput.outputFilename != null) {
       final String content = utf8.decode(
-          _fileSystem!.file(compilerOutput.outputFilename).readAsBytesSync());
+          _fileSystem.file(compilerOutput.outputFilename).readAsBytesSync());
       return ExpressionCompilationResult(
           content, compilerOutput.errorCount > 0);
     }

packages/flutter_tools/lib/src/test/flutter_web_goldens.dart

@@ -27,7 +27,7 @@ class TestGoldenComparator {
   TestGoldenComparator(this.shellPath, this.compilerFactory, {
     required Logger logger,
     required FileSystem fileSystem,
-    required ProcessManager? processManager,
+    required ProcessManager processManager,
     required this.webRenderer,
   }) : tempDir = fileSystem.systemTempDirectory.createTempSync('flutter_web_platform.'),
        _logger = logger,
@@ -39,7 +39,7 @@ class TestGoldenComparator {
   final TestCompiler Function() compilerFactory;
   final Logger _logger;
   final FileSystem _fileSystem;
-  final ProcessManager? _processManager;
+  final ProcessManager _processManager;
   final WebRendererMode webRenderer;
 
   TestCompiler? _compiler;
@@ -95,7 +95,7 @@ class TestGoldenComparator {
       'FLUTTER_TEST_BROWSER': 'chrome',
       'FLUTTER_WEB_RENDERER': webRenderer == WebRendererMode.html ? 'html' : 'canvaskit',
     };
-    return _processManager!.start(command, environment: environment);
+    return _processManager.start(command, environment: environment);
   }
 
   Future<String?> compareGoldens(Uri testUri, Uint8List bytes, Uri goldenKey, bool? updateGoldens) async {

packages/flutter_tools/test/general.shard/ios/code_signing_test.dart

@@ -39,7 +39,7 @@ void main() {
 
     testWithoutContext('No auto-sign if Xcode project settings are not available', () async {
       final Map<String, String>? signingConfigs = await getCodeSigningIdentityDevelopmentTeamBuildSetting(
-        buildSettings: null,
+        buildSettings: <String, String>{},
         processManager: FakeProcessManager.empty(),
         platform: macosPlatform,
         logger: logger,