Daniel Rosenwasser

Announcing TypeScript 2.2 RC

February 2nd, 2017

TypeScript 2.2 is just around the corner, and today we're announcing its release candidate! If you're first hearing about it, TypeScript is a language that just takes JavaScript and adds optional static types. Being built on JavaScript means that you don't have to learn much more beyond what you know from JavaScript, and all your existing ...

Writing Declaration Files for @types

December 14th, 2016

A while back we talked about how TypeScript 2.0 made it easier to grab declaration files for your favorite library. Declaration files, if you're not familiar, are just files that describe the shape of an existing JavaScript codebase to TypeScript. By using declaration files (also called .d.ts files), you can avoid misusing libraries and get ...

Announcing TypeScript 2.1

December 7th, 2016

We spread ourselves thin, but this is the moment you've been awaiting - TypeScript 2.1 is here! For those who are unfamiliar, TypeScript is a language that brings you all the new features of JavaScript, along with optional static types. This gives you an editing experience that can't be beat, along with stronger checks against typos and ...

TypeScript 2.1 RC: Better Inference, Async Functions, and More

November 8th, 2016

Today we're happy to announce our release candidate for TypeScript 2.1! If you aren't familiar with it, TypeScript is a language that adds optional static types to JavaScript, and brings new features from ES6 and later to whatever JavaScript runtime you're using. As usual you can get the RC through NuGet, or just by running You can then ...

TypeScript 2.0 is now available!

September 22nd, 2016

Today we're excited to announce the final release of TypeScript 2.0! TypeScript 2.0 has been a great journey for the team, with several contributions from the community and partners along the way. It brings several new features that enhance developer productivity, advances TypeScript's alignment with ECMAScript's evolution, provides wide ...

Announcing TypeScript 2.0 RC

August 30th, 2016

TypeScript 2.0 is almost out, and today we're happy to show just how close we are with our release candidate! If you haven't used TypeScript yet, check out the intro tutorial on our website to get started. To start using the RC now, you can download TypeScript 2.0 RC for Visual Studio 2015 (which requires VS Update 3), grab it through NuGet, ...

Announcing TypeScript 2.0 Beta

July 11th, 2016

Today we're excited to roll out our beta release of TypeScript 2.0. If you're not familiar with TypeScript yet, you can start learning it today on our website. To get your hands on the beta, you can download TypeScript 2.0 Beta for Visual Studio 2015 (which will require VS 2015 Update 3), or just run This release includes plenty of new ...

The Future of Declaration Files

June 15th, 2016

Declaration files (.d.ts files) are a fundamental part of using existing JavaScript libraries in TypeScript, but getting them has always been a place where we've known there was room for improvement. As we get closer to TypeScript 2.0, we're very excited to show off a sneak peak of our plan to simplify things. Getting type declarations in ...

Making New TypeScript Projects a Breeze

May 10th, 2016

One of the goals of TypeScript has always been to make writing JavaScript projects a clean, easy, and simple process. We're always looking at where things could be improved and listening to the community to get ideas on how to do this better. You may've recently heard the term "JavaScript fatigue" thrown around to describe the feeling of ...