Due to the popularity of the open web, JavaScript is becoming an essential language and since 2009 it has been running on servers too thanks to NodeJS. The problem is that due to JavaScript's dynamic type system, it is hard to create great tooling around the language such as sensible auto-completion, refactoring support, type-checking and modularisation.

TypeScript is an open source lanaguage from Microsoft that solves this problem by introducing an optional type system and class-based object-orientation, which make great tooling for large applications possible.

TypeScript let's you write JavaScript that is robust enough for the enterprise and that can run in any browser, on any host and on any operating system.

Free download