Daniel Rosenwasser

Senior Program Manager, TypeScript

Daniel Rosenwasser is the program manager of the TypeScript team. He has a passion for programming languages, compilers, and great developer tooling.

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Announcing TypeScript 5.1

June 1st, 2023
Today we're excited to announce the release of TypeScript 5.1! If you're not yet familiar with TypeScript, it's a language that builds on JavaScript by adding constructs called types. These types can describe some details about our program, and can be checked by TypeScript before they're compiled away in order to catch possible typos, logic ...

Announcing TypeScript 5.1 RC

May 18th, 2023
Today we're excited to announce our Release Candidate of TypeScript 5.1! Between now and the stable release of TypeScript 5.1, we expect no further changes apart from critical bug fixes. To get started using the RC, you can get it through NuGet, or through npm with the following command: Here's a quick list of what's new in TypeScript 5.1...

Announcing TypeScript 5.1 Beta

April 18th, 2023
Today we're announcing our beta release of TypeScript 5.1! To get started using the beta, you can get it through NuGet, or through npm with the following command: Here's a quick list of what's new in TypeScript 5.1! Easier Implicit Returns for undefined-Returning Functions In JavaScript, if a function finishes ...

Announcing TypeScript 5.0

March 16th, 2023
Today we're excited to announce the release of TypeScript 5.0! This release brings many new features, while aiming to make TypeScript smaller, simpler, and faster. We've implemented the new decorators standard, added functionality to better support ESM projects in Node and bundlers, provided new ways for library authors to control generic ...

TypeScript’s Migration to Modules

March 9th, 2023
One of the most impactful things we've worked on in TypeScript 5.0 isn't a feature, a bug fix, or a data structure optimization. Instead, it's an infrastructure change. In TypeScript 5.0, we restructured our entire codebase to use ECMAScript modules, and switched to a newer emit target. What to Know Now, before we dive in, we want to set ...

Announcing TypeScript 5.0 RC

March 1st, 2023
Today we're excited to announce our Release Candidate of TypeScript 5.0! Between now and the stable release of TypeScript 5.0, we expect no further changes apart from critical bug fixes. This release brings many new features, while aiming to make TypeScript, smaller, simpler, and faster. We've implemented the new decorators standard, ...
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Announcing TypeScript 5.0 Beta

January 26th, 2023
Today we're excited to announce our beta release of TypeScript 5.0! This release brings many new features, while aiming to make TypeScript, smaller, simpler, and faster. We've implemented the new decorators standard, functionality to better support ESM projects in Node and bundlers, new ways for library authors to control generic inference, ...

Announcing TypeScript 4.9

November 15th, 2022
Today we are excited to announce the availability of TypeScript 4.9! If you're not familiar with TypeScript, it's a language that builds on JavaScript by adding types and type-checking. Types can describe things like the shapes of our objects, how functions can be called, and whether a property can be null or undefined. TypeScript can check...

Announcing TypeScript 4.9 RC

November 1st, 2022
Today we're excited to announce our Release Candidate (RC) of TypeScript 4.9. Between now and the stable release of TypeScript 4.9, we expect no further changes apart from critical bug fixes. To get started using the RC, you can get it through NuGet, or use npm with the following command: You can also get editor support by Here's...

Ten Years of TypeScript

October 1st, 2022
Today is TypeScript's birthday! But this birthday is a special one - 10 years ago today, on October 1st, 2012, TypeScript was unveiled publicly for the first time. The Early Days When TypeScript first debuted, there was a lot of skepticism - and understandably so. To some JavaScript users, a team trying to bring static types to JavaScript ...