45 builder options across 8 categories.
JavaScript is the language of the web, running in browsers, Node.js servers, and edge runtimes. Agent rules for JavaScript typically enforce module format (ESM vs CJS), linting standards (ESLint, StandardJS), and async patterns to prevent common runtime errors.
Architecture patterns and principles
Select libraries used in your project
Code quality tools
Performance optimization guidelines
Community-sourced coding standards
CSS approach and styling tools
Testing frameworks and conventions