⚠️ Breaking Change
Impact Score: 7/10
TypeScript 3.4.1
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 3.4](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-34) page.
⚡ Executive Summary (TL;DR)
TypeScript v3.4.1. 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 3.4](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-34) page.
🔧 Bug Fixes & Patches (2)
- fixed issues query for Typescript v3.4 RC.
- fixed issues query for Typescript v3.4.1.
📄 View Raw Release Notes (Original Developer Log)
For release notes, check out the [release announcement](https://devblogs.microsoft.com/typescript/announcing-typescript-3-4/).
For new features, check out the [What's new in TypeScript 3.4](https://github.com/Microsoft/TypeScript/wiki/What's-new-in-TypeScript#typescript-34).
For breaking changes, check out the [Breaking changes in TypeScript 3.4](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-34) page.
For the complete list of fixed issues, check out the
* [fixed issues query for Typescript v3.4 RC](https://github.com/Microsoft/TypeScript/issues?utf8=%E2%9C%93&q=is%3Aissue+milestone%3A%22TypeScript+3.4%22+is%3Aclosed+).
* [fixed issues query for Typescript v3.4.1](https://github.com/Microsoft/TypeScript/issues?utf8=%E2%9C%93&q=is%3Aissue+milestone%3A%22TypeScript+3.4.1%22+is%3Aclosed+).
Downloads are available on:
* [npm](https://www.npmjs.com/package/typescript)
* [Visual Studio 2017](https://marketplace.visualstudio.com/items?itemName=TypeScriptTeam.typescript-341-vs2017) ([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)
Special thanks to all of our contributors this release:
* [@AnyhowStep](https://github.com/AnyhowStep)
* Alan Pierce
* Alexander Tarasyuk
* Anders Hejlsberg
* Andy Hanson
* Benedikt Meurer
* Benjamin Lichtman
* Collins Abitekaniza
* Daniel Krom
* Daniel Rosenwasser
* [@fullheightcoding](https://github.com/fullheightcoding)
* Gabriela Araujo Britto
* [@ispedals](https://github.com/ispedals)
* Jack Williams
* Jesse Trinity
* Jordi Oliveras Rovira
* Joseph Wunderlich
* K. Preißer
* Kagami Sascha Rosylight
* Klaus Meinhardt
* Masahiro Wakame
* Matt McCutchen
* Matthew Aynalem
* Mine Starks
* Nathan Shively-Sanders
* Ron Buckton
* Ryan Cavanaugh
* Sheetal Nandi
* Titian Cernicova-Dragomir
* [@tomholub](https://github.com/tomholub)
* Wenlu Wang
* Wesley Wigham