# NodeJS-Native Pre-commit Setup Migration

## Overview

Successfully migrated from Python's `pre-commit` framework to a 100% NodeJS-native solution using Husky and lint-staged.

## What Was Removed

- `.pre-commit-config.yaml` - Python pre-commit configuration
- `.secrets.baseline` - Python detect-secrets baseline
- Python `pre-commit` dependency requirement
- Python `detect-secrets` dependency requirement

## What Was Added

### Core Tools

- **Husky v9** - Modern Git hooks manager
- **lint-staged** - Run tools on staged files only (performance optimization)

### NodeJS Alternatives for Previous Python Tools

| Python Tool        | NodeJS Alternative          | Purpose                                |
| ------------------ | --------------------------- | -------------------------------------- |
| `pre-commit-hooks` | Built into Husky hook       | File checks, trailing whitespace, etc. |
| `mirrors-prettier` | `prettier` (direct)         | Code formatting                        |
| `eslint` (local)   | `eslint` (direct)           | JavaScript/TypeScript linting          |
| `tsc` (local)      | `typescript` (direct)       | Type checking                          |
| `hadolint`         | `dockerfilelint`            | Dockerfile linting                     |
| `shellcheck-py`    | Custom shell checks in hook | Shell script validation                |
| `markdownlint-cli` | `markdownlint-cli2`         | Markdown linting                       |
| `detect-secrets`   | `@secretlint/node`          | Secret detection                       |

## New Package.json Scripts

```json
{
  "lint:markdown": "markdownlint-cli2 \"**/*.md\"",
  "lint:markdown:fix": "markdownlint-cli2 --fix \"**/*.md\"",
  "lint:docker": "dockerfilelint docker/Dockerfile",
  "check:secrets": "secretlint \"**/*\"",
  "check:editorconfig": "eclint check .",
  "fix:editorconfig": "eclint fix ."
}
```

## Enhanced lint-staged Configuration

```json
{
  "lint-staged": {
    "*.{js,jsx,ts,tsx}": ["eslint --fix", "prettier --write"],
    "*.{json,yaml,yml,md,css,scss,html}": ["prettier --write"],
    "*.md": ["markdownlint-cli2 --fix"],
    "docker/Dockerfile": ["dockerfilelint"],
    "*": ["eclint fix"]
  }
}
```

## Husky Hooks

### `.husky/pre-commit`

- Runs lint-staged for efficient file-specific checks
- TypeScript type checking
- Large file detection (>500KB)
- Merge conflict marker detection
- Basic private key detection

### `.husky/commit-msg`

- Basic commit message validation

## Key Benefits

1. **No Python Dependencies** - Pure NodeJS ecosystem
2. **Better Performance** - lint-staged only processes changed files
3. **Simpler Setup** - No Python virtual environment needed
4. **Consistent Toolchain** - Everything uses npm/bun
5. **Modern Tooling** - Latest versions of all tools
6. **Easier CI/CD** - Same tools in development and CI

## Usage

### Setup

```bash

./scripts/setup-pre-commit.sh
```

### Manual Commands

```bash
bun run format                # Format all files
bun run lint:fix             # Fix linting issues
bun run lint:markdown:fix    # Fix markdown issues

bun run check:secrets        # Check for secrets
bun run type-check           # TypeScript validation
```

### What Happens on Commit

1. **lint-staged** processes only changed files:
   - ESLint auto-fix + Prettier for JS/TS files
   - Prettier for JSON/YAML/MD/CSS files
   - Markdownlint for Markdown files
   - Dockerfilelint for Dockerfile
   - EditorConfig fixes for all files
2. **TypeScript** type checking on entire project
3. **Security checks** for large files, merge conflicts, private keys

## Migration Complete ✅

The project now uses a modern, efficient, NodeJS-native pre-commit setup that provides the same (and better) functionality as the previous Python-based solution.