TypeScript
TypeScript is a strongly typed, object-oriented programming language that builds on JavaScript by adding static type definitions. It compiles to plain JavaScript and is designed for the development of large-scale applications, providing enhanced tooling and error checking at compile time. Developed and maintained by Microsoft, it is widely used in web development, particularly with frameworks like Angular, React, and Vue.js.
Developers should learn TypeScript when building complex, scalable web applications where type safety and maintainability are critical, such as in enterprise projects or large codebases. It helps catch errors early during development, improves code readability through explicit types, and integrates seamlessly with existing JavaScript libraries and frameworks. Use cases include front-end development with React or Angular, back-end Node.js applications, and full-stack projects requiring robust type checking.