⚠️ Breaking Change
Impact Score: 7/10
TypeScript 3.1
Source available — automated, not human-reviewed
Component: typescript · 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 3.1](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-31) page.
⚡ Executive Summary (TL;DR)
TypeScript v3.1.1. Source highlight: For release notes, check out the release announcement
Who Does This Impact? (Role-Based Analysis)
💻 Software Engineers & Devs
Check the source notes against the package and APIs you use before upgrading.
📊 Product & Engineering Leads
Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.
⚙️ DevOps & Security
Verify the target version, runtime requirements and rollback procedure in the official documentation.
⚠️ Breaking Changes & Deprecations (1)
- For breaking changes, check out the [Breaking changes in TypeScript 3.1](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-31) page.
📄 View Raw Release Notes (Original Developer Log)
For release notes, check out the [release announcement](https://blogs.msdn.microsoft.com/typescript/2018/09/27/announcing-typescript-3-1)
For new features, check out the [What's new in TypeScript 3.1](https://github.com/Microsoft/TypeScript/wiki/What's-new-in-TypeScript#typescript-31).
For breaking changes, check out the [Breaking changes in TypeScript 3.1](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-31) page.
For the complete list of fixed issues, check out the [fixed issues query for Typescript 3.1](https://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+3.1%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/3.1.0)
Special thanks to all contributors to this release:
* Alexander Tarasyuk
* Anders Hejlsberg
* Andrew Casey
* Andy Hanson
* Benjamin Lichtman
* Brian Terlson
* @csigs
* Dan Rollo
* Daniel Imms
* Daniel Rosenwasser
* David Sherret
* Elizabeth Dinella
* Frederico Bittencourt
* Jack Williams
* James Keane
* Jordi Oliveras Rovira
* Klaus Meinhardt
* Martin Probst
* Matt McCutchen
* Mine Starks
* Minh Nguyen
* Nathan Day
* Mohamed Hegazy
* Nathan Shively-Sanders
* Ron Buckton
* Rhys van der Waerden
* Ryan Cavanaugh
* Sam Lanning
* Sheetal Nandi
* Wenlu Wang
* Wesley Wigham
* Tim Schaub