Announcing TypeScript 5.1

June 1, 2023 Jun 1, 2023 06/1/23
Daniel Rosenwasser
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 18, 2023 May 18, 2023 05/18/23
Daniel Rosenwasser
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...

Introducing Deopt Explorer

May 12, 2023 May 12, 2023 05/12/23
Ron Buckton
Over the past few months, during the lead-up to the TypeScript 5.0 beta, our team spent a good portion of our time looking for ways to improve the performance of our compiler so that your projects build faster. One of the ways we improved was by looking into an oft overlooked aspect of many JavaScript VMs: inline caching. A Brief Primer on ...

Announcing TypeScript 5.1 Beta

April 18, 2023 Apr 18, 2023 04/18/23
Daniel Rosenwasser
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 16, 2023 Mar 16, 2023 03/16/23
Daniel Rosenwasser
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 9, 2023 Mar 9, 2023 03/9/23
authorsDaniel Rosenwasser, Jake Bailey
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 1, 2023 Mar 1, 2023 03/1/23
Daniel Rosenwasser
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 26, 2023 Jan 26, 2023 01/26/23
Daniel Rosenwasser
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 15, 2022 Nov 15, 2022 11/15/22
Daniel Rosenwasser
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 1, 2022 Nov 1, 2022 11/1/22
Daniel Rosenwasser
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...