⚠️ Breaking Change
Impact Score: 7/10
TypeScript 1.5
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 1.5](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-15) page.
For breaking changes in the compiler API, check out the [API Breaking Changes in TypeScript 1.5](https://github.com/Microsoft/TypeScript/wiki/API-Breaking-Changes#typescript-15) page.
⚡ Executive Summary (TL;DR)
TypeScript v1.5.3. Source highlight: For release notes, and links to installing for various platforms, 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 (2)
- For breaking changes, check out the [Breaking changes in TypeScript 1.5](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-15) page.
- For breaking changes in the compiler API, check out the [API Breaking Changes in TypeScript 1.5](https://github.com/Microsoft/TypeScript/wiki/API-Breaking-Changes#typescript-15) page.
📄 View Raw Release Notes (Original Developer Log)
For release notes, and links to installing for various platforms, check out the [release announcement](http://blogs.msdn.com/b/typescript/archive/2015/07/20/announcing-typescript-1-5.aspx)
> Note: This release has the version tag of `1.5.2.0` for Visual Studio 2015 and `1.5.3.0` for Visual Studio 2013.
For new features, checkout the [what's new in TypeScript 1.5](https://github.com/Microsoft/TypeScript/wiki/What's-new-in-TypeScript#typescript-15) page.
For breaking changes, check out the [Breaking changes in TypeScript 1.5](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-15) page.
For breaking changes in the compiler API, check out the [API Breaking Changes in TypeScript 1.5](https://github.com/Microsoft/TypeScript/wiki/API-Breaking-Changes#typescript-15) page.
For the complete list of fixed issues, check out the [fixed issues query for TypeScript 1.5](https://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+1.5%22+label%3A%22fixed%22+).
Special thanks to all contributers to this release:
- Arnav Singh
- Basarat Ali Syed
- Bryan Forbes
- Caitlin Potter
- Chris Bubernak
- Colin Snover
- Dick van den Brink
- Dirk Bäumer
- Frank Wallis
- Guillaume Salles
- Ivo Gabe de Wolff
- James Whitney
- Johannes Rieken
- Jonathan Bond-Caron
- Kagami Sascha Rosylight
- Keith Mashinter
- Lorant Pinter
- Masahiro Wakame
- Oleg Mihailik
- Pedro Maltez
- Shengping Zhong
- Stan Thomas
- Thomas Vitkauskas
- Tingan Ho
- TruongSinh Tran-Nguyen
- Zev Spitz