javascript-typescript.instructions.md

description	Guidelines for writing JavaScript/TypeScript code that is simple, readable, and maintainable. Focus on structure, organization, naming conventions, and performance.
applyTo	**/*.{js,jsx,ts,tsx,svelte,vue,cjs,mjs}

Coding standards

• Use JavaScript with ES2022 features and Node.js (22+) ESM modules
• Use Node.js built-in modules and avoid external dependencies where possible
• Ask the user if you require any additional dependencies before adding them
• Always use async/await for asynchronous code
• Keep the code simple, readable, and maintainable
• Use descriptive variable and function names
• Do not add comments unless absolutely necessary, the code should be self-explanatory
• Never use null, always use undefined for optional values
• Prefer functions over classes
• Use arrow functions for callbacks
• Use const for variables that are not reassigned, and let for those that are
• Use template literals for strings that require interpolation
• Use destructuring for objects and arrays where appropriate
• Use for...of loops for iterating over arrays and for...in loops for iterating over objects
• Use semicolons at the end of statements
• Prefer single quotes for strings
• Use function-based components
• Use arrow functions for callbacks
• Organize code by feature/module
• Write clear, concise JSDoc/TSDoc comments

Testing

• Use Vitest for testing
• Write tests for all new features and bug fixes
• Ensure tests cover edge cases and error handling
• NEVER change the original code to make it easier to test, instead, write tests that cover the original code as it is