Comment configurer un environnement de dev en un instant avec Claude Code

Ever spent half a day setting up a dev environment on a new PC or for a new project? With Claude Code, it takes minutes.

1. Scaffold a New Project

Stand up a project from zero.

mkdir my-app && cd my-app
claude -p "
Set up a Next.js 15 + TypeScript + Tailwind CSS + Prisma + PostgreSQL project.

Include:
- ESLint + Prettier config
- Vitest setup
- Docker Compose (PostgreSQL)
- .env.example
- GitHub Actions CI
- CLAUDE.md

Run npm install when done.
"

In 5 minutes you get a best-practice project ready to go.

2. Bootstrap an Existing Repo

After cloning a team repo, automate the setup.

git clone https://github.com/team/project.git
cd project
claude -p "
Set up the dev environment for this project.
Read README.md and package.json, then:
- Install dependencies
- Set up env vars (.env.example -> .env)
- Set up the database
- Run migrations
- Start the dev server to verify

If errors occur, fix them automatically.
"

It reads the README, parses package.json, runs commands in order, and auto-fixes errors along the way.

3. Docker Environment

Docker Compose config in one shot.

claude -p "
Create a docker-compose.yml with:
- PostgreSQL 16 (port 5432)
- Redis 7 (port 6379)
- MinIO S3-compatible (ports 9000/9001)

Include health checks, volume persistence, and .env variable loading.
Run docker compose up -d.
"

4. Editor Config Standardization

Align everyone’s editor settings.

claude -p "
Create VS Code config files:

.vscode/settings.json:
- Auto-format on save with Prettier
- TypeScript strict mode
- Auto-sort imports

.vscode/extensions.json:
- Recommended extensions for the team

.editorconfig:
- 2-space indent
- Trim trailing whitespace
- Final newline
"

Commit to Git and every team member works with the same settings. See Team Collaboration Guide.

5. CI/CD Pipeline

Auto-generate GitHub Actions.

claude -p "
Create a GitHub Actions workflow for this project:
- On push: lint -> typecheck -> test -> build
- On PR: above + coverage report
- On main merge: above + deploy to Cloudflare Pages
"

See CI/CD Setup Guide.

6. Environment Variable Management

Keep .env.example in sync automatically.

claude -p "
Scan all files for process.env.XXX references.
Output a complete .env.example with dummy values.
If .env.example exists, only add missing vars.
"

Never forget to update .env.example when adding new env vars.

7. Record Setup Steps in CLAUDE.md

Save the setup procedure so it auto-replays for new members.

claude -p "
Add a '## Environment Setup' section to CLAUDE.md.
Document every step from clone to running dev server.
"

Next time someone joins, Claude Code reads CLAUDE.md and sets up automatically. See CLAUDE.md Best Practices.

Gotchas

Node.js Version Management

Use .nvmrc or .node-version — Claude Code auto-detects them.

Docker Permission Issues

On Linux/WSL, permission errors are common. Just tell Claude Code “fix this Docker error.”

Apple Silicon vs Intel

Build behavior differs. Note it in CLAUDE.md and Claude Code adapts.

Conclusion

• New project scaffolding in 5 minutes
• Existing project setup automated (including error recovery)
• Docker, editor, CI/CD configs generated in one shot
• Env var management with zero drift
• CLAUDE.md preserves setup steps for the team

Dev environment setup has moved from “manual labor” to “ask Claude Code.” See the Anthropic Claude Code docs.