TypeScript 'using' Keyword Automates Resource Cleanup to Prevent Memory Leaks

TypeScript's 'using' keyword, part of the ECMAScript Explicit Resource Management proposal, offers a language-level solution to resource leaks caused by unreleased database connections, file handles, and WebSocket clients. The feature works through a disposable protocol where objects implement a Symbol.dispose or Symbol.asyncDispose method that TypeScript calls automatically when a resource exits its scope. Under the hood, the compiler desugars 'using' declarations into try-finally blocks, ensuring cleanup happens regardless of early returns or thrown exceptions. Multiple resources are handled via an internal disposal stack, releasing them in reverse order of acquisition to respect natural dependency chains. The keyword eliminates the need for manual finally block management, reducing a common class of production bugs across TypeScript codebases.