Using Git Worktrees for Flutter Development

Overview

Git worktrees let you work on multiple branches simultaneously in separate directories. Each worktree is fully independent - you can run different Flutter versions, have different dependencies, without affecting your main workspace.

Core principle: Isolated workspace = safe experimentation + parallel development

Announce at start: "I'm using the flutter-worktrees skill to create an isolated workspace."

When to Use

• Starting a new feature that needs isolation
• Working on experimental changes
• Need to compare implementations side-by-side
• Want to keep main workspace clean
• Running long-running tests in background

The Process

Step 1: Create Worktree

# From main repository
git worktree add ../flutter-app-feature-auth feature/auth

# Or create new branch
git worktree add -b feature/auth ../flutter-app-feature-auth main

Naming convention: ../[project-name]-[feature-name]

Step 2: Navigate to Worktree

cd ../flutter-app-feature-auth

Step 3: Flutter Setup (Critical for Flutter Projects!)

# Install dependencies
flutter pub get

# Verify Flutter is working
flutter doctor

# If needed, run code generation
dart run build_runner build --delete-conflicting-outputs

Step 4: Verify Setup

# Check project state
flutter analyze
flutter test

# Should show no issues if setup is correct

Step 5: Work on Feature

Follow normal development workflow:

• flutter-brainstorming
• flutter-planning
• flutter-executing

All changes stay isolated in this worktree.

Step 6: Cleanup (After Merge/Discard)

# From main repository
cd ../flutter-app  # Back to main

# Remove worktree
git worktree remove ../flutter-app-feature-auth

# If branch was merged, it's already in main
# If discarded, the branch still exists and can be deleted:
git branch -D feature/auth

Worktree Directory Structure

parent-directory/
├── flutter-app/                  # Main repository
│   ├── lib/
│   ├── test/
│   ├── pubspec.yaml
│   └── .git/                     # Main git directory
├── flutter-app-feature-auth/     # Worktree 1
│   ├── lib/
│   ├── test/
│   ├── pubspec.yaml
│   └── .git                      # File pointing to main .git
└── flutter-app-feature-profile/  # Worktree 2
    ├── lib/
    ├── test/
    ├── pubspec.yaml
    └── .git

Flutter-Specific Considerations

Dependencies

Each worktree has its own:

• .dart_tool/ directory
• pubspec.lock (can differ if experimenting with versions)
• Build cache

Always run flutter pub get after creating worktree!

Code Generation

If project uses code generation (freezed, json_serializable, etc.):

dart run build_runner build --delete-conflicting-outputs

IDE Setup

VS Code: Open worktree folder as new workspace Android Studio: Open worktree folder as new project

Platform-Specific Builds

Each worktree can have different:

• iOS simulator running
• Android emulator connected
• Web server running

No conflicts between worktrees!

Example Workflow

# 1. Create isolated workspace for auth feature
git worktree add -b feature/auth ../flutter-app-auth main

# 2. Navigate and setup
cd ../flutter-app-auth
flutter pub get
dart run build_runner build --delete-conflicting-outputs

# 3. Verify
flutter analyze
flutter test

# 4. Work on feature (using flutter-craft skills)
# ... implement auth feature ...

# 5. When done, back to main
cd ../flutter-app

# 6. Merge if ready
git merge feature/auth

# 7. Cleanup
git worktree remove ../flutter-app-auth

Red Flags

Never:

• Forget flutter pub get in new worktree
• Edit main repository while expecting changes in worktree
• Delete worktree directory manually (use git worktree remove)
• Have same file open in IDE from both main and worktree

If worktree has issues:

# List all worktrees
git worktree list

# Prune stale worktree references
git worktree prune

Integration with Other Skills

After creating worktree:

• Use flutter-brainstorming to design feature
• Use flutter-planning to create implementation plan
• Use flutter-executing or flutter-subagent-dev to implement

After feature complete:

• Use flutter-finishing to decide merge/PR/keep/discard
• Cleanup worktree after merge

Quick Reference