Home / DEVTOOLS / TypeScript / v4.5.5
TypeScript v4.5.5stable Released Jan 20, 2022
Impact Score: 5/10

TypeScript 4.5.5

Source available — automated, not human-reviewed

Component: typescript · Channel: stable. Automated analysis, not a compatibility certification. How this works.

Analysis updated: 2026-11-01.

Compatibility not verified — check source notes
$ npm install --save-dev --save-exact [email protected]
📄 .MD
🔧 Bug Fixes 6
⚡ Executive Summary (TL;DR)

TypeScript v4.5.5. Source highlight: This patch release includes a number of fixes to language service crashes and assertion violations, along with improvements to JSX attribute snippets.

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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.

🔧 Bug Fixes & Patches (6)

  • fixed issues query for Typescript 4.5.0 (Beta).
  • fixed issues query for Typescript 4.5.1 (RC).
  • fixed issues query for Typescript 4.5.2 (Stable).
  • fixed issues query for Typescript 4.5.3 (Stable).
  • fixed issues query for Typescript 4.5.4 (Stable).
  • fixed issues query for Typescript 4.5.5 (Stable).
📄 View Raw Release Notes (Original Developer Log)
This [patch release](https://github.com/microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+4.5.5%22+is%3Aclosed) includes a number of fixes to language service crashes and assertion violations, along with improvements to JSX attribute snippets. For the complete list of fixed issues, check out the * [fixed issues query for Typescript 4.5.0 (Beta)](https://github.com/microsoft/TypeScript/issues?q=milestone%3A%22TypeScript+4.5.0%22+). * [fixed issues query for Typescript 4.5.1 (RC)](https://github.com/microsoft/TypeScript/issues?q=milestone%3A%22TypeScript+4.5.1%22+). * [fixed issues query for Typescript 4.5.2 (Stable)](https://github.com/microsoft/TypeScript/issues?q=milestone%3A%22TypeScript+4.5.2%22+). * [fixed issues query for Typescript 4.5.3 (Stable)](https://github.com/microsoft/TypeScript/issues?q=milestone%3A%22TypeScript+4.5.3%22+). * [fixed issues query for Typescript 4.5.4 (Stable)](https://github.com/microsoft/TypeScript/issues?q=milestone%3A%22TypeScript+4.5.4%22+). * [fixed issues query for Typescript 4.5.5 (Stable)](https://github.com/microsoft/TypeScript/issues?q=milestone%3A%22TypeScript+4.5.5%22+). Downloads are available on: * [npm](https://www.npmjs.com/package/typescript) <!-- * [NuGet package](https://www.nuget.org/packages/Microsoft.TypeScript.MSBuild) -->
← Older Version TypeScript v4.5.4