Develop web frontends and backends with JavaScript/TypeScript. Covers implementing new features, reading and refactoring existing code, writing tests, and working with package managers, debugging tools and the ecosystem's tooling.Develop web frontends and backends with JavaScript/TypeScript. Covers implementing new features, reading and refactoring existing code, writing tests, and working with package managers, debugging tools and the ecosystem's tooling.Develop web frontends and backends with JavaScript/TypeScript. Covers implementing new features, reading and refactoring existing code, writing tests, and working with package managers, debugging tools and the ecosystem's tooling. moreDevelop web frontends and backends with JavaScript/TypeScript. Covers implementing new features, reading and refactoring existing code, writing tests, and working with package managers, debugging tools and the ecosystem's tooling.