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| 1 | +# CLAUDE.md |
| 2 | + |
| 3 | +🚨 **CRITICAL**: This file contains MANDATORY guidelines for Claude Code (claude.ai/code). You MUST follow these guidelines EXACTLY as specified. Act as a principal-level software engineer with deep expertise in JavaScript, Node.js, and package URL parsing. |
| 4 | + |
| 5 | +## 📚 Self-Learning Protocol |
| 6 | +Claude Code should periodically scan and learn from CLAUDE.md files across Socket repositories: |
| 7 | +- `socket-cli/CLAUDE.md` |
| 8 | +- `socket-packageurl-js/CLAUDE.md` |
| 9 | +- `socket-registry/CLAUDE.md` |
| 10 | +- `socket-sdk-js/CLAUDE.md` |
| 11 | + |
| 12 | +When working in any Socket repository, check for updates and patterns in other claude.md files to ensure consistency across the ecosystem. |
| 13 | + |
| 14 | +## 🎯 Your Role |
| 15 | +You are a **Principal Software Engineer** responsible for: |
| 16 | +- Writing production-quality, maintainable code |
| 17 | +- Making architectural decisions with long-term impact in mind |
| 18 | +- Ensuring code follows established patterns and conventions |
| 19 | +- Mentoring through code examples and best practices |
| 20 | +- Prioritizing system reliability, performance, and developer experience |
| 21 | +- Taking ownership of technical decisions and their consequences |
| 22 | + |
| 23 | +## Commands |
| 24 | + |
| 25 | +### Development Commands |
| 26 | +- **Build**: `pnpm build` |
| 27 | +- **Test**: `pnpm test` (runs all tests) |
| 28 | +- **Test unit**: `pnpm test:unit` |
| 29 | +- **Type check**: `pnpm check:tsc` |
| 30 | +- **Lint**: `pnpm check:lint` |
| 31 | +- **Check all**: `pnpm check` (runs all checks in parallel) |
| 32 | +- **Fix linting**: `pnpm check:lint:fix` or `pnpm fix` |
| 33 | +- **Coverage**: `pnpm coverage` |
| 34 | +- **Coverage percentage**: `pnpm coverage:percent` |
| 35 | +- **Clean**: `pnpm clean` (removes cache, coverage, node_modules) |
| 36 | + |
| 37 | +### Testing Best Practices - CRITICAL: NO -- FOR FILE PATHS |
| 38 | +- **🚨 NEVER USE `--` BEFORE TEST FILE PATHS** - This runs ALL tests, not just your specified files! |
| 39 | +- **Test single file**: ✅ CORRECT: `pnpm test:unit path/to/file.test.js` |
| 40 | + - ❌ WRONG: `pnpm test:unit -- path/to/file.test.js` (runs ALL tests!) |
| 41 | +- **Test with pattern**: `pnpm test:unit -t "pattern"` |
| 42 | +- **Update snapshots**: `pnpm test:unit -u` or `pnpm testu` |
| 43 | +- **Coverage report**: `pnpm test:unit:coverage` |
| 44 | + |
| 45 | +### Git Commit Guidelines |
| 46 | +- **🚨 FORBIDDEN**: NEVER add Claude co-authorship or Claude signatures to commits |
| 47 | +- **🚨 FORBIDDEN**: Do NOT include "Generated with Claude Code" or similar AI attribution in commit messages |
| 48 | +- **Commit messages**: Should be written as if by a human developer, focusing on the what and why of changes |
| 49 | +- **Professional commits**: Write clear, concise commit messages that describe the actual changes made |
| 50 | +- **Commit without tests**: `git commit --no-verify` (skips pre-commit hooks including tests) |
| 51 | + |
| 52 | +### Package Management |
| 53 | +- **Package Manager**: This project uses pnpm |
| 54 | +- **Install dependencies**: `pnpm install` |
| 55 | +- **Add dependency**: `pnpm add <package>` |
| 56 | +- **Add dev dependency**: `pnpm add -D <package>` (use `--save-exact` for exact versions) |
| 57 | +- **Update dependencies**: `pnpm update` |
| 58 | + |
| 59 | +## Important Project-Specific Rules |
| 60 | + |
| 61 | +### 1. Package URL (purl) Standards |
| 62 | +- This project implements the [Package URL specification](https://github.com/package-url/purl-spec) |
| 63 | +- Maintain strict compliance with purl spec |
| 64 | +- Test against reference implementations |
| 65 | +- Document any deviations or extensions |
| 66 | + |
| 67 | +### 2. Performance Critical |
| 68 | +- This is a high-performance parser used in security scanning |
| 69 | +- Optimize for speed without sacrificing correctness |
| 70 | +- Benchmark changes against existing performance |
| 71 | +- Avoid unnecessary allocations |
| 72 | + |
| 73 | +### 3. Testing |
| 74 | +- Always run lint and typecheck before committing: |
| 75 | + - `pnpm check:lint` |
| 76 | + - `pnpm check:tsc` |
| 77 | +- Run tests with: `pnpm test` |
| 78 | +- Test coverage is critical - maintain high coverage |
| 79 | + |
| 80 | +### 4. Git Workflow |
| 81 | +- **DO NOT commit automatically** - let the user review changes first |
| 82 | +- Use `--no-verify` flag only when explicitly requested |
| 83 | +- Always provide clear, descriptive commit messages |
| 84 | + |
| 85 | +### 5. Code Style |
| 86 | +- Follow existing patterns in the codebase |
| 87 | +- Don't add comments unless specifically requested |
| 88 | +- Maintain consistency with surrounding code |
| 89 | +- Use existing utilities from @socketsecurity/registry where available |
| 90 | + |
| 91 | +### 6. Error Handling |
| 92 | +- Parser errors should be descriptive and actionable |
| 93 | +- Validate inputs thoroughly |
| 94 | +- Handle edge cases gracefully |
| 95 | +- Never throw on valid purls |
| 96 | + |
| 97 | +## Architecture |
| 98 | + |
| 99 | +This is a JavaScript implementation of the Package URL (purl) specification for parsing and constructing package URLs. |
| 100 | + |
| 101 | +### Core Structure |
| 102 | +- **Main entry**: `src/index.js` - Main exports and API |
| 103 | +- **Parser**: Core parsing logic for purl strings |
| 104 | +- **Normalizer**: Normalization logic for different package types |
| 105 | +- **Validator**: Input validation and sanitization |
| 106 | +- **Types**: Type-specific handling for npm, pypi, maven, etc. |
| 107 | +- **Scripts**: `scripts/` - Build and utility scripts |
| 108 | +- **Tests**: `test/` - Comprehensive test suite |
| 109 | + |
| 110 | +### Key Features |
| 111 | +- Full purl specification compliance |
| 112 | +- High-performance parsing |
| 113 | +- Type-specific normalization |
| 114 | +- Comprehensive validation |
| 115 | +- Extensive test coverage |
| 116 | + |
| 117 | +## 🔧 Code Style (MANDATORY) |
| 118 | + |
| 119 | +### 📁 File Organization |
| 120 | +- **File extensions**: Use `.js` for JavaScript files, `.mjs` for ES modules |
| 121 | +- **Import order**: Node.js built-ins first, then third-party packages, then local imports |
| 122 | +- **Import grouping**: Group imports by source (Node.js, external packages, local modules) |
| 123 | +- **Type imports**: When using JSDoc, keep type imports organized |
| 124 | + |
| 125 | +### Naming Conventions |
| 126 | +- **Constants**: Use `UPPER_SNAKE_CASE` for constants |
| 127 | +- **Files**: Use kebab-case for filenames |
| 128 | +- **Variables**: Use camelCase for variables and functions |
| 129 | +- **Classes**: Use PascalCase for classes |
| 130 | + |
| 131 | +### 🏗️ Code Structure (CRITICAL PATTERNS) |
| 132 | +- **Error handling**: 🚨 REQUIRED - Use try-catch blocks and handle errors gracefully |
| 133 | +- **Array destructuring**: Use object notation `{ 0: key, 1: data }` instead of array destructuring `[key, data]` |
| 134 | +- **Comment periods**: 🚨 MANDATORY - ALL comments MUST end with periods. This includes single-line comments, multi-line comments, and inline comments. No exceptions. |
| 135 | +- **Comment placement**: Place comments on their own line, not to the right of code |
| 136 | +- **Comment formatting**: Use fewer hyphens/dashes and prefer commas, colons, or semicolons for better readability |
| 137 | +- **Sorting**: 🚨 MANDATORY - Always sort lists, exports, and items alphabetically for consistency |
| 138 | +- **Await in loops**: When using `await` inside for-loops, add `// eslint-disable-next-line no-await-in-loop` when sequential processing is intentional |
| 139 | +- **If statement returns**: Never use single-line return if statements; always use proper block syntax with braces |
| 140 | +- **List formatting**: Use `-` for bullet points in text output, not `•` or other Unicode characters |
| 141 | +- **Existence checks**: Perform simple existence checks first before complex operations |
| 142 | +- **Destructuring order**: Sort destructured properties alphabetically in const declarations |
| 143 | +- **Function ordering**: Place functions in alphabetical order, with private functions first, then exported functions |
| 144 | +- **Object mappings**: Use objects with `__proto__: null` for static mappings to prevent prototype pollution |
| 145 | +- **Array length checks**: Use `!array.length` instead of `array.length === 0` |
| 146 | +- **Catch parameter naming**: Use `catch (e)` instead of `catch (error)` for consistency |
| 147 | +- **Number formatting**: 🚨 REQUIRED - Use underscore separators (e.g., `20_000`) for large numeric literals |
| 148 | + |
| 149 | +### 🗑️ Safe File Operations (SECURITY CRITICAL) |
| 150 | +- **File deletion**: 🚨 ABSOLUTELY FORBIDDEN - NEVER use `rm -rf`. 🚨 MANDATORY - ALWAYS use `pnpm dlx trash-cli` |
| 151 | +- **Examples**: |
| 152 | + - ❌ CATASTROPHIC: `rm -rf directory` (permanent deletion - DATA LOSS RISK) |
| 153 | + - ❌ REPOSITORY DESTROYER: `rm -rf "$(pwd)"` (deletes entire repository) |
| 154 | + - ✅ SAFE: `pnpm dlx trash-cli directory` (recoverable deletion) |
| 155 | +- **Why this matters**: trash-cli enables recovery from accidental deletions via system trash/recycle bin |
| 156 | + |
| 157 | +### 🔧 Formatting Rules |
| 158 | +- **Indentation**: 2 spaces (no tabs) |
| 159 | +- **Quotes**: Single quotes for strings preferred |
| 160 | +- **Semicolons**: No semicolons preferred |
| 161 | +- **Variables**: Use camelCase for variables and functions |
| 162 | +- **Linting**: Uses ESLint, Oxlint, and Biome |
| 163 | +- **Line length**: Target 80 character line width where practical |
| 164 | + |
| 165 | +## Debugging and Troubleshooting |
| 166 | +- **Performance testing**: Use benchmarks to verify parsing speed |
| 167 | +- **Spec compliance**: Test against purl-spec test suite |
| 168 | +- **Edge cases**: Test with unusual but valid package URLs |
| 169 | + |
| 170 | +--- |
| 171 | + |
| 172 | +# 🚨 CRITICAL BEHAVIORAL REQUIREMENTS |
| 173 | + |
| 174 | +## 🎯 Principal Engineer Mindset |
| 175 | +- Act with the authority and expertise of a principal-level software engineer |
| 176 | +- Make decisions that prioritize long-term maintainability over short-term convenience |
| 177 | +- Anticipate edge cases and potential issues before they occur |
| 178 | +- Write code that other senior engineers would be proud to review |
| 179 | +- Take ownership of technical decisions and their consequences |
| 180 | + |
| 181 | +## 🛡️ ABSOLUTE RULES (NEVER BREAK THESE) |
| 182 | +- 🚨 **NEVER** create files unless absolutely necessary for the goal |
| 183 | +- 🚨 **ALWAYS** prefer editing existing files over creating new ones |
| 184 | +- 🚨 **FORBIDDEN** to proactively create documentation files (*.md, README) unless explicitly requested |
| 185 | +- 🚨 **MANDATORY** to follow ALL guidelines in this CLAUDE.md file without exception |
| 186 | +- 🚨 **REQUIRED** to do exactly what was asked - nothing more, nothing less |
| 187 | + |
| 188 | +## 🎯 Quality Standards |
| 189 | +- Code MUST pass all existing lints and type checks |
| 190 | +- Changes MUST maintain backward compatibility unless explicitly breaking changes are requested |
| 191 | +- All patterns MUST follow established codebase conventions |
| 192 | +- Error handling MUST be robust and user-friendly |
| 193 | +- Performance considerations MUST be evaluated for any changes |
| 194 | + |
| 195 | +## Notes |
| 196 | + |
| 197 | +- This project is critical infrastructure for Socket's package analysis |
| 198 | +- Performance is paramount - this code runs millions of times |
| 199 | +- Maintain strict purl specification compliance |
| 200 | +- Always run lint and typecheck before committing |
| 201 | +- Test coverage should remain high |
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