feat: Expose pub get's --offline flag on the bootstrap command

docs/commands/bootstrap.mdx

@@ -91,6 +91,8 @@ melos bootstrap --diff="main"
 - The `--enforce-lockfile` flag is used to enforce versions from `.lock` files.
     - Ensure .lock files exist, as failure may occur if they're not checked in.
 - The `--skip-linking` flag is used to skip the local linking of workspace packages.
+- The `--offline` flag is used to only resolve dependencies from the local cache by running
+  `pub get` with the `--offline` flag.
 
 
 In addition to the above flags, the `melos bootstrap` command supports a few different flags that can be defined in

packages/melos/lib/src/command_runner/bootstrap.dart

@@ -22,6 +22,12 @@ class BootstrapCommand extends MelosCommand {
       negatable: false,
       help: 'Skips locally linking workspace packages.',
     );
+    argParser.addFlag(
+      'offline',
+      negatable: false,
+      help: 'Run pub get with --offline to resolve dependencies from local '
+          'cache.',
+    );
   }
 
   @override
@@ -44,6 +50,7 @@ class BootstrapCommand extends MelosCommand {
       enforceLockfile: argResults?['enforce-lockfile'] as bool? ?? false,
       noExample: argResults?['no-example'] as bool,
       skipLinking: argResults?['skip-linking'] as bool,
+      offline: argResults?['offline'] as bool,
     );
   }
 }

packages/melos/lib/src/commands/bootstrap.dart

@@ -7,6 +7,7 @@ mixin _BootstrapMixin on _CleanMixin {
     bool noExample = false,
     bool enforceLockfile = false,
     bool skipLinking = false,
+    bool offline = false,
   }) async {
     final workspace =
         await createWorkspace(global: global, packageFilters: packageFilters);
@@ -16,6 +17,7 @@ mixin _BootstrapMixin on _CleanMixin {
       CommandWithLifecycle.bootstrap,
       () async {
         final bootstrapCommandConfig = workspace.config.commands.bootstrap;
+        final runOffline = bootstrapCommandConfig.runPubGetOffline || offline;
         late final hasLockFile =
             File(p.join(workspace.path, 'pubspec.lock')).existsSync();
         final enforceLockfileConfigValue =
@@ -30,7 +32,7 @@ mixin _BootstrapMixin on _CleanMixin {
           ),
           'get',
           if (noExample) '--no-example',
-          if (bootstrapCommandConfig.runPubGetOffline) '--offline',
+          if (runOffline) '--offline',
           if (shouldEnforceLockfile) '--enforce-lockfile',
         ].join(' ');
 

packages/melos/test/commands/bootstrap_test.dart

@@ -928,6 +928,42 @@ Updating common dependencies in workspace packages...
     └> Updated environment
   > SUCCESS
 
+Generating IntelliJ IDE files...
+  > SUCCESS
+
+ -> 1 packages bootstrapped
+''',
+        ),
+      );
+    });
+  });
+
+  group('melos bs --offline', () {
+    test('should run pub get with --offline', () async {
+      final workspaceDir = await createTemporaryWorkspace();
+      await createProject(
+        workspaceDir,
+        const PubSpec(name: 'a'),
+      );
+
+      final logger = TestLogger();
+      final config = await MelosWorkspaceConfig.fromWorkspaceRoot(workspaceDir);
+      final melos = Melos(logger: logger, config: config);
+
+      await runMelosBootstrap(melos, logger, offline: true);
+
+      expect(
+        logger.output,
+        ignoringAnsii(
+          '''
+melos bootstrap
+  └> ${workspaceDir.path}
+
+Running "dart pub get --offline" in workspace packages...
+  ✓ a
+    └> packages/a
+  > SUCCESS
+
 Generating IntelliJ IDE files...
   > SUCCESS
 
@@ -943,9 +979,13 @@ Future<void> runMelosBootstrap(
   Melos melos,
   TestLogger logger, {
   bool skipLinking = false,
+  bool offline = false,
 }) async {
   try {
-    await melos.bootstrap(skipLinking: skipLinking);
+    await melos.bootstrap(
+      skipLinking: skipLinking,
+      offline: offline,
+    );
   } on BootstrapException {
     // ignore: avoid_print
     print(logger.output);