How to generate a .gitignore for common stacks

1. Choose presets

   "Presets (comma)" accepts a comma-separated list from `node, python, java, vscode, idea, macos, windows, linux`. Unknown tokens are silently dropped — only recognised ones produce rules.

2. Press Run

   Result is a single `gitignore` field with concatenated blocks. Each preset block is preceded by a `# === preset ===` header so the source is obvious when you commit the file.

3. What goes in each preset

   `node` covers `node_modules`, `dist`, `.npm`, `.pnpm-store`, `.next`. `python` covers `__pycache__/`, `*.pyc`, `.venv`, `*.egg-info`. `vscode` ignores `.vscode/` plus a `!.vscode/settings.json` allow. `macos` adds `.DS_Store`; `windows` adds `Thumbs.db`.

4. Layering on your own rules

   After running, append your project-specific lines (`.env*`, `coverage/`, build outputs, secrets) below the generated blocks. Order doesn't matter for ignore vs allow — git uses the last matching pattern.