β οΈ Breaking Change
Impact Score: 7/10
TypeScript 2.9
Source available β automated, not human-reviewed
Component: typescript Β· Channel: stable. Automated analysis, not a compatibility certification. How this works.
Analysis updated: 2026-11-01.
Breaking-change evidence from the source
For breaking changes, check out the [Breaking changes in TypeScript 2.9](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-29) page.
β‘ Executive Summary (TL;DR)
TypeScript v2.9.1. Source highlight: For release notes, check out the release announcement
Who Does This Impact? (Role-Based Analysis)
π» Software Engineers & Devs
Check the source notes against the package and APIs you use before upgrading.
π Product & Engineering Leads
Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.
βοΈ DevOps & Security
Verify the target version, runtime requirements and rollback procedure in the official documentation.
β οΈ Breaking Changes & Deprecations (1)
- For breaking changes, check out the [Breaking changes in TypeScript 2.9](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-29) page.
π View Raw Release Notes (Original Developer Log)
For release notes, check out the [release announcement](https://blogs.msdn.microsoft.com/typescript/2018/05/31/announcing-typescript-2-9/)
For new features, check out the [What's new in TypeScript 2.9](https://github.com/Microsoft/TypeScript/wiki/What's-new-in-TypeScript#typescript-29).
For breaking changes, check out the [Breaking changes in TypeScript 2.9](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-29) page.
For the complete list of fixed issues, check out the issues fixed in [TypeScript 2.9 RC](https://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.9%22+label%3A%22fixed%22+) and [after TypeScript 2.9 RC](https://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.9.1%22+label%3A%22fixed%22+).
Download:
- [npm](https://www.npmjs.com/package/typescript)
- [Visual Studio 2015 plugin](https://www.microsoft.com/en-us/download/details.aspx?id=48593)
- [Visual Studio 2017](https://www.microsoft.com/en-us/download/details.aspx?id=55258) ([Select new version in project options](https://github.com/Microsoft/TypeScript/wiki/Updating-TypeScript-in-Visual-Studio-2017))
- [NuGet package](https://www.nuget.org/packages/Microsoft.TypeScript.MSBuild/2.9.1)
Special thanks to all contributors to this release:
* Aditya Daflapurkar
* Adrien Gibrat
* Alan Agius
* Alex Khomchenko
* Alex Ryan
* Alexander Tarasyuk
* Anders Hejlsberg
* Andrew Casey
* Andrew Faulkner
* Andy Hanson
* Armando Aguirre
* Artem Tyurin
* Arthur Ozga
* Benjamin Lichtman
* @bluelovers
* Bowden Kenny
* Brandon Slade
* Daniel Rosenwasser
* Derek P Sifford
* Dhruv Rajvanshi
* Ecole Keine
* @falsandtru
* Holger Jeromin
* Jack Williams
* Jordi Oliveras Rovira
* Joscha Feth
* Josh Goldberg
* Kevin Donnelly
* KhαΊ£i
* Klaus Meinhardt
* Maarten Sijm
* Matt Bierner
* Mine Starks
* Mohamed Hegazy
* Nathan Shively-Sanders
* Paul Koerbitz
* @rhysd
* Ron Buckton
* Ryan Cavanaugh
* Sheetal Nandi
* @TravCav
* Vakhurin Sergey
* Wenlu Wang
* Wesley Wigham
* @Zzzen