TypeScript 3.4 Release

The TypeScript project provides a compiler that checks your programs based on these types to prevent certain classes of errors, and then strips them out of your program so you can get clean readable JavaScript code that will run in any ECMAScript runtime (like your favorite browser, or Node.js). TypeScript also leverages this type information to provide a language server, which can be used for powerful cross-platform editor tooling like code completions, find-all-references, quick fixes, and refactorings. TypeScript 3.4 introduces a new syntax for using a new modifier for array types.

Source: devblogs.microsoft.com