feat: downgrade, upgrade

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

@@ -6,10 +6,16 @@ import 'base.dart';
 class BootstrapCommand extends MelosCommand {
   BootstrapCommand(super.config) {
     setupPackageFilterParser();
+    argParser.addOption(
+      'mode',
+      allowed: const ['get', 'upgrade', 'downgrade'],
+      defaultsTo: 'get',
+      help: 'Run pub get, pub upgrade, or pub downgrade',
+    );
     argParser.addFlag(
       'no-example',
       negatable: false,
-      help: 'Run pub get with/without example pub get',
+      help: 'Run with/without fetching example dependencies.',
     );
     argParser.addFlag(
       'enforce-lockfile',
@@ -21,8 +27,7 @@ class BootstrapCommand extends MelosCommand {
     argParser.addFlag(
       'offline',
       negatable: false,
-      help: 'Run pub get with --offline to resolve dependencies from local '
-          'cache.',
+      help: 'Run with --offline to resolve dependencies from local cache.',
     );
   }
 
@@ -41,6 +46,7 @@ class BootstrapCommand extends MelosCommand {
   FutureOr<void>? run() {
     final melos = Melos(logger: logger, config: config);
     return melos.bootstrap(
+      mode: BootstrapMode.fromString(argResults?['mode'] as String? ?? 'get'),
       global: global,
       packageFilters: parsePackageFilters(config.path),
       enforceLockfile: argResults?['enforce-lockfile'] as bool?,

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

@@ -7,6 +7,7 @@ mixin _BootstrapMixin on _CleanMixin {
     bool noExample = false,
     bool? enforceLockfile,
     bool offline = false,
+    BootstrapMode mode = BootstrapMode.get,
   }) async {
     final workspace =
         await createWorkspace(global: global, packageFilters: packageFilters);
@@ -21,10 +22,12 @@ mixin _BootstrapMixin on _CleanMixin {
             File(p.join(workspace.path, 'pubspec.lock')).existsSync();
         final enforceLockfileConfigValue =
             workspace.config.commands.bootstrap.enforceLockfile;
-        final shouldEnforceLockfile =
-            (enforceLockfile ?? enforceLockfileConfigValue) && hasLockFile;
+        final shouldEnforceLockfile = (mode == BootstrapMode.get) &&
+            (enforceLockfile ?? enforceLockfileConfigValue) &&
+            hasLockFile;
 
-        final pubCommandForLogging = _buildPubGetCommand(
+        final pubCommandForLogging = _buildPubCommand(
+          mode: mode,
           workspace: workspace,
           noExample: noExample,
           runOffline: runOffline,
@@ -67,6 +70,7 @@ mixin _BootstrapMixin on _CleanMixin {
           );
 
           await _runPubGetForWorkspace(
+            mode,
             workspace,
             noExample: noExample,
             runOffline: runOffline,
@@ -110,12 +114,14 @@ mixin _BootstrapMixin on _CleanMixin {
   }
 
   Future<void> _runPubGetForWorkspace(
+    BootstrapMode mode,
     MelosWorkspace workspace, {
     required bool noExample,
     required bool runOffline,
     required bool enforceLockfile,
   }) async {
     await runPubGetForPackage(
+      mode,
       workspace,
       workspace.rootPackage,
       noExample: noExample,
@@ -126,13 +132,15 @@ mixin _BootstrapMixin on _CleanMixin {
 
   @visibleForTesting
   Future<void> runPubGetForPackage(
+    BootstrapMode mode,
     MelosWorkspace workspace,
     Package package, {
     required bool noExample,
     required bool runOffline,
     required bool enforceLockfile,
   }) async {
-    final command = _buildPubGetCommand(
+    final command = _buildPubCommand(
+      mode: mode,
       workspace: workspace,
       noExample: noExample,
       runOffline: runOffline,
@@ -171,7 +179,8 @@ mixin _BootstrapMixin on _CleanMixin {
     }
   }
 
-  List<String> _buildPubGetCommand({
+  List<String> _buildPubCommand({
+    required BootstrapMode mode,
     required MelosWorkspace workspace,
     required bool noExample,
     required bool runOffline,
@@ -182,7 +191,7 @@ mixin _BootstrapMixin on _CleanMixin {
         useFlutter: workspace.isFlutterWorkspace,
         workspace: workspace,
       ),
-      'get',
+      mode.name,
       if (noExample) '--no-example',
       if (runOffline) '--offline',
       if (enforceLockfile) '--enforce-lockfile',
@@ -411,3 +420,18 @@ class BootstrapException implements MelosException {
         '${package.path}.';
   }
 }
+
+enum BootstrapMode {
+  get,
+  upgrade,
+  downgrade;
+
+  factory BootstrapMode.fromString(String value) {
+    return switch (value) {
+      'get' => BootstrapMode.get,
+      'upgrade' => BootstrapMode.upgrade,
+      'downgrade' => BootstrapMode.downgrade,
+      _ => throw ArgumentError('Invalid mode specified'),
+    };
+  }
+}

packages/melos/test/commands/bootstrap_test.dart

@@ -2,6 +2,7 @@ import 'dart:io';
 
 import 'package:melos/melos.dart';
 import 'package:melos/src/command_configs/command_configs.dart';
+import 'package:melos/src/commands/runner.dart';
 import 'package:melos/src/common/glob.dart';
 import 'package:melos/src/common/io.dart';
 import 'package:melos/src/common/utils.dart';
@@ -589,6 +590,7 @@ Generating IntelliJ IDE files...
       );
 
       await melos.runPubGetForPackage(
+        BootstrapMode.get,
         workspace,
         workspace.rootPackage,
         noExample: true,