JavaScript

Best practices for writing modern, type-safe JavaScript using JSDoc annotations checked by TypeScript. Covers type modeling, modern language features (ES2024/2025), web APIs, error handling, and module patterns.

This skill targets plain .js files with checkJs: true in jsconfig.json. It does not cover TypeScript .ts files.

Project Setup

jsconfig.json

Every JS project using typed JSDoc should have a jsconfig.json: