[flutter_tools] display message for current null safety mode (#70718)

packages/flutter_tools/lib/src/base/logger.dart

@@ -418,7 +418,8 @@ class WindowsStdoutLogger extends StdoutLogger {
                .replaceAll('🖼️', '')
                .replaceAll('✗', 'X')
                .replaceAll('✓', '√')
-               .replaceAll('🔨', '');
+               .replaceAll('🔨', '')
+               .replaceAll('💪', '');
     _stdio.stdoutWrite(windowsMessage);
   }
 }

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

@@ -723,7 +723,7 @@ class _ResidentWebRunner extends ResidentWebRunner {
         ?? debuggingOptions.buildInfo.packageConfig,
     );
     final Status devFSStatus = globals.logger.startProgress(
-      'Syncing files to device ${device.device.name}...',
+      'Waiting for connection from debug service on ${device.device.name}...',
     );
     final UpdateFSReport report = await device.devFS.update(
       mainUri: await _generateEntrypoint(
@@ -833,6 +833,18 @@ class _ResidentWebRunner extends ResidentWebRunner {
           ..writeAsStringSync(websocketUri.toString());
       }
       globals.printStatus('Debug service listening on $websocketUri');
+      globals.printStatus('');
+      if (debuggingOptions.buildInfo.nullSafetyMode ==  NullSafetyMode.sound) {
+        globals.printStatus('💪 Running with sound null safety 💪', emphasis: true);
+      } else {
+        globals.printStatus(
+          'Running with unsound null safety',
+          emphasis: true,
+        );
+        globals.printStatus(
+          'For more information see https://dart.dev/null-safety/unsound-null-safety',
+        );
+      }
     }
     appStartedCompleter?.complete();
     connectionInfoCompleter?.complete(DebugConnectionInfo(wsUri: websocketUri));

packages/flutter_tools/lib/src/resident_runner.dart

@@ -1219,15 +1219,8 @@ abstract class ResidentRunner {
         ipv6: ipv6,
         disableServiceAuthCodes: debuggingOptions.disableServiceAuthCodes
       );
-      // This will wait for at least one flutter view before returning.
-      final Status status = globals.logger.startProgress(
-        'Waiting for ${device.device.name} to report its views...',
-      );
-      try {
-        await device.vmService.getFlutterViews();
-      } finally {
-        status.stop();
-      }
+      await device.vmService.getFlutterViews();
+
       // This hooks up callbacks for when the connection stops in the future.
       // We don't want to wait for them. We don't handle errors in those callbacks'
       // futures either because they just print to logger and is not critical.

packages/flutter_tools/lib/src/run_hot.dart

@@ -1095,13 +1095,24 @@ class HotRunner extends ResidentRunner {
       printHelpDetails();
     }
     for (final FlutterDevice device in flutterDevices) {
-      final String dname = device.device.name;
       // Caution: This log line is parsed by device lab tests.
       globals.printStatus(
-        'An Observatory debugger and profiler on $dname is available at: '
+        'An Observatory debugger and profiler on ${device.device.name} is available at: '
         '${device.vmService.httpAddress}',
       );
     }
+    globals.printStatus('');
+    if (debuggingOptions.buildInfo.nullSafetyMode ==  NullSafetyMode.sound) {
+      globals.printStatus('💪 Running with sound null safety 💪', emphasis: true);
+    } else {
+      globals.printStatus(
+        'Running with unsound null safety',
+        emphasis: true,
+      );
+      globals.printStatus(
+        'For more information see https://dart.dev/null-safety/unsound-null-safety',
+      );
+    }
   }
 
   Future<void> _evictDirtyAssets() async {

packages/flutter_tools/test/general.shard/resident_runner_test.dart

@@ -1510,6 +1510,7 @@ void main() {
           commandHelp.P,
           commandHelp.a,
           'An Observatory debugger and profiler on null is available at: null',
+          '\n💪 Running with sound null safety 💪',
           ''
         ].join('\n')
     ));