Local Bug Finder

Local Bug Finder is a VS Code extension that detects common JavaScript and TypeScript issues entirely offline using static analysis.

Features

• Real-time diagnostics for JavaScript and TypeScript
• Detects assignment inside conditionals like if (x = 5)
• Detects empty blocks in if, loops, and other statements
• Detects duplicate declarations in the same scope
• Detects unused variables
• Detects undefined variables
• Optional console.log warnings
• Optional strict semicolon checking
• Output channel report for issue details

Project Structure

• package.json
• tsconfig.json
• src/extension.ts
• src/diagnosticEngine.ts
• src/rules/jsRules.ts

Setup

1. Open this folder in VS Code.
2. Run npm install.
3. Run npm run compile.

Run in VS Code

1. Open the project in VS Code.
2. Press F5 to launch a development host.
3. Open a JavaScript or TypeScript file.
4. The extension will analyze the file automatically and show diagnostics.
5. Use the Bug Finder Report output channel to see the issue list.

Package as .vsix

npm install
npm run compile
npx @vscode/vsce package

Publish to Marketplace

1. Create a publisher in the Visual Studio Code Marketplace.
2. Run npx @vscode/vsce publish.
3. Provide your Personal Access Token when prompted.

Settings

In VS Code settings, search for localBugFinder.

• localBugFinder.strictMode: enable stricter analysis rules.
• localBugFinder.enableConsoleLogWarning: warn on console.log usage.
• localBugFinder.enabledRules.*: enable or disable specific checks.

Monetization Ideas

• Offer paid rule packs for advanced security patterns.
• Provide premium rule sets for team code quality enforcement.
• Bundle Local Bug Finder with developer tooling or refactoring helpers.

Notes

• No external APIs are used.
• All analysis runs locally.
• The rule engine uses AST parsing and custom validation logic.