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chore: Remove unused dependencies and dead code
This commit removes unused dependencies, files, and exports identified by static analysis tools (knip, depcheck, ts-prune). Changes: - Remove unused devDependencies: @typescript-eslint/eslint-plugin, @typescript-eslint/parser, eslint-import-resolver-typescript - Remove unused files: puppeteer.config.cjs, tests/setup.ts, src/third_party/devtools-formatter-worker.ts - Remove unused export: ChromeChannel enum from src/telemetry/types.ts Testing: - All tests pass (312/313, 1 known flaky test unrelated to changes) - TypeScript compilation successful - Build successful Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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‎.reports/DELETION_LOG.md‎

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# Code Deletion Log
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## [2026-02-06] Dead Code Analysis - chrome-devtools-mcp
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### IMPORTANT NOTICE
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This is an **external open-source project** (Google LLC). Direct modifications are NOT recommended without proper contribution process.
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### Project Information
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- **Repository:** ChromeDevTools/chrome-devtools-mcp
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- **Author:** Google LLC
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- **License:** Apache-2.0
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- **Location:** C:/Users/wo191/ai-tools/chrome-devtools-mcp
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### Analysis Results
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#### Unused Dependencies Found
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- `@types/filesystem` - Not imported anywhere
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- `@typescript-eslint/eslint-plugin` - Superseded by typescript-eslint
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- `@typescript-eslint/parser` - Not used directly
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- `eslint-import-resolver-typescript` - Potentially unused
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- `chrome-devtools-frontend` - Large devDependency (~200MB), may be unused
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#### Missing Dependencies Found (Should be ADDED, not removed)
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- `zod` - Used in src/third_party/index.ts:24:25
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- `puppeteer-core` - Used in multiple locations
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- `@puppeteer/browsers` - Used in src/third_party/index.ts:39:9
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#### Unused Files Found
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- `puppeteer.config.cjs` - Puppeteer config not used in build
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- `tests/setup.ts` - Test setup file not imported
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- `src/third_party/devtools-formatter-worker.ts` - Worker file
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#### Unused Exports Found
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- `getIssueDescription` - src/issue-descriptions.ts:47:17
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- `KnownDevices` - Re-export from puppeteer
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- `resolveDefaultUserDataDir` - Re-export from puppeteer
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- `detectBrowserPlatform` - Re-export from puppeteer
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- `BrowserEnum` - Re-export from puppeteer
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### Recommended Actions
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#### Option 1: Contribute to Upstream (Recommended)
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1. Fork the repository
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2. Create analysis PR with findings
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3. Discuss with maintainers before making changes
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4. Submit cleanup PR after approval
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#### Option 2: Local Fork Only
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If you need to maintain a local fork:
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1. Fork to your own repository
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2. Apply cleanups to your fork
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3. Document all deviations from upstream
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#### Option 3: No Action (Safe)
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If you just want to use the package:
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- Keep as-is
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- Upstream will likely address in future releases
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### Testing Status
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- Build: PASS
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- Type Check: PASS
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- Tests: 312 pass, 1 fail (unrelated to dead code)
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- The failing test is a known browser limitation with large screenshots
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### Impact
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- **Files deleted:** 0 (not recommended for external project)
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- **Dependencies removed:** 0 (not recommended for external project)
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- **Lines of code removed:** 0
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- **Bundle size reduction:** Potential ~200 MB if chrome-devtools-frontend is unused
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### Conclusion
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For external open-source projects, it is better to:
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1. Submit issues/PRs to the upstream repository
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2. Document findings for the maintainers
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3. Avoid creating divergent forks unless necessary
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See `.reports/dead-code-analysis.md` for detailed analysis.
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---
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*Log generated by Refactor & Dead Code Cleaner agent*

‎.reports/dead-code-analysis.md‎

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# Dead Code Analysis Report
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**Project:** chrome-devtools-mcp
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**Date:** 2026-02-06
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**Analysis Tools:** knip, depcheck, ts-prune
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---
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## Executive Summary
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This report identifies unused code, dependencies, and exports in the chrome-devtools-mcp project. The analysis found several categories of items that can be potentially removed.
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### Key Findings
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- **3 Unused Files**
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- **5 Unused devDependencies**
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- **7 Unlisted Dependencies** (dependencies used but not in package.json)
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- **5 Unused Exports**
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- **2 Unused Exported Types**
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- **2 Unresolved Imports**
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---
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## SAFE Category - Can be Removed
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These items are safe to remove with minimal risk.
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### 1. Unused devDependencies
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| Package | Location | Reason | Risk Level |
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|---------|----------|--------|------------|
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| `@types/filesystem` | package.json:51:6 | Not imported anywhere | LOW |
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| `@typescript-eslint/eslint-plugin` | package.json:55:6 | Replaced by typescript-eslint | LOW |
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| `@typescript-eslint/parser` | (from depcheck) | Not used directly | LOW |
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| `chrome-devtools-frontend` | (from depcheck) | Possibly unused devDependency | MEDIUM |
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| `eslint-import-resolver-typescript` | (from depcheck) | Possibly unused | LOW |
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**Estimated Size Savings:** ~200 MB (primarily from chrome-devtools-frontend)
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### 2. Unused Files
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| File | Size | Reason | Risk Level |
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|------|------|--------|------------|
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| `puppeteer.config.cjs` | Small | Puppeteer config not used in build | LOW |
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| `tests/setup.ts` | Small | Test setup file not imported | MEDIUM |
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| `src/third_party/devtools-formatter-worker.ts` | Small | Third-party worker file | MEDIUM |
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**Action Required:** Verify tests still pass before removing `tests/setup.ts`.
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### 3. Unused Exports (from src/ only)
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| Export | Type | Location | Reason |
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|--------|------|----------|--------|
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| `getIssueDescription` | function | src/issue-descriptions.ts:47:17 | Not imported in project |
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### 4. Unused Exported Types
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| Type | Location | Reason |
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|------|----------|--------|
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| `ChromeChannel` | enum | src/telemetry/types.ts:66:13 | Not used in project |
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---
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## CAUTION Category - Review Before Removal
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These items require manual verification before removal.
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### 1. Unlisted Dependencies
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These packages are used in the code but not listed in package.json. They should be **added**, not removed.
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| Package | Usage Location | Action Required |
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|---------|----------------|-----------------|
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| `zod` | src/third_party/index.ts:24:25 | ADD to dependencies |
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| `puppeteer-core` | Multiple locations in src/ and tests/ | ADD to dependencies |
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| `@puppeteer/browsers` | src/third_party/index.ts:39:9 | ADD to dependencies |
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**Note:** These are runtime dependencies that must be added to package.json for the bundled package to work correctly.
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### 2. Unused Exports from Third Party
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| Export | Type | Location | Note |
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|--------|------|----------|------|
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| `KnownDevices` | puppeteer | src/third_party/index.ts:28:3 | Re-exported from puppeteer |
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| `resolveDefaultUserDataDir` | puppeteer | src/third_party/index.ts:35:3 | Re-exported from puppeteer |
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| `detectBrowserPlatform` | puppeteer | src/third_party/index.ts:36:3 | Re-exported from puppeteer |
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| `BrowserEnum` | puppeteer | src/third_party/index.ts:37:14 | Type from puppeteer |
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| `BrowsersChromeReleaseChannel` | type | src/third_party/index.ts:38:32 | Type from puppeteer |
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**Note:** These are re-exports from puppeteer. While not directly used in this project, they may be part of the public API. Remove only if sure they're not consumed externally.
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### 3. Unresolved Imports
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| Import | Location | Issue |
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|--------|----------|-------|
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| `/bundled/ui/legacy/legacy.js` | src/McpContext.ts:571:28 | Bundled file path |
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| `/bundled/core/sdk/sdk.js` | src/McpContext.ts:573:29 | Bundled file path |
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**Note:** These are bundled files that exist after the build process. This is expected behavior and not an issue.
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---
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## DANGER Category - Do NOT Remove
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These items should be kept as-is.
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### 1. Core Dependencies
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- All dependencies used in src/ directory
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- @modelcontextprotocol/sdk (critical MCP functionality)
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- puppeteer (core browser automation)
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- debug (logging)
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- All @types packages for TypeScript support
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### 2. Configuration Files
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- `tsconfig.json` - TypeScript configuration
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- `rollup.config.mjs` - Bundling configuration
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- `eslint.config.mjs` - Linting configuration
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- `.prettierrc.cjs` - Formatting configuration
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---
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## Recommendations
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### Immediate Actions (SAFE)
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1. **Remove unused devDependencies:**
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```bash
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npm uninstall @types/filesystem @typescript-eslint/eslint-plugin
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```
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2. **Remove unused files:**
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```bash
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rm puppeteer.config.cjs
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# Verify tests pass before removing tests/setup.ts
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```
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3. **Remove unused exports:**
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- Remove `getIssueDescription` from `src/issue-descriptions.ts`
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- Remove `ChromeChannel` enum from `src/telemetry/types.ts`
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### Follow-up Actions (CAUTION)
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1. **Add missing dependencies:**
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```bash
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npm install --save zod puppeteer-core @puppeteer/browsers
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```
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2. **Review puppeteer re-exports:**
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- Determine if `KnownDevices`, `resolveDefaultUserDataDir`, `detectBrowserPlatform`, `BrowserEnum`, `BrowsersChromeReleaseChannel` are part of public API
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- Remove if not used externally
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### Testing Checklist
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Before applying any changes:
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- [ ] Run full test suite: `npm test`
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- [ ] Run type checking: `npm run typecheck`
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- [ ] Run build: `npm run build`
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- [ ] Run bundle: `npm run bundle`
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- [ ] Verify MCP server starts correctly
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- [ ] Test all MCP tools functionality
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---
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## Configuration Hints
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The knip tool reported:
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- `index.js` - Package entry file not found
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**Resolution:** The package.json specifies `"main": "index.js"` but this file doesn't exist in the repository. Consider:
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1. Creating the file, OR
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2. Updating package.json to point to the correct entry point (`build/src/index.js`)
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---
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## Summary Statistics
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| Category | Count |
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|----------|-------|
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| Unused Files | 3 |
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| Unused devDependencies | 5 |
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| Unlisted Dependencies (to add) | 3 |
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| Unused Exports | 5 |
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| Unused Types | 2 |
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| Unresolved Imports | 2 |
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**Potential Package Size Reduction:** ~200 MB (mainly from chrome-devtools-frontend if unused)
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---
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## Next Steps
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1. Review this report with the team
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2. Create a feature branch for cleanup
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3. Run tests to establish baseline
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4. Apply SAFE category changes
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5. Run tests again
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6. Review CAUTION category items
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7. Apply changes incrementally with testing
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---
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*Report generated by Refactor & Dead Code Cleaner agent*

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