Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

TypeScript 4.9 Iteration Plan

See original GitHub issue

This document outlines our focused tasks for TypeScript 4.9. It minimally indicates intent to investigate tasks or contribute to an implementation. Nothing is set in stone, but we will strive to complete these tasks in a reasonable timeframe.

Date Event
August 23rd TypeScript 4.8 Release
September 16th Create 4.9 Beta (4.9.1) Build for Testing
September 20th TypeScript 4.9 Beta Release
October 28th Create 4.9 RC (4.9.2) Build for Testing
November 1st TypeScript 4.9 RC Release
November 11th Create 4.9 Final (4.9.3) Build for Testing
November 15th TypeScript 4.9 Final Release 🚀
    dateFormat  YYYY-MM-DD
    TypeScript 4.8 Stabilization Period : 2022-08-05, 2022-08-25
    TypeScript 4.9 Beta Development : 2022-08-05, 2022-09-16
    TypeScript 4.9 RC Development : 2022-09-16, 2022-10-28
    TypeScript 4.9 Stabilization Period : 2022-10-28, 2022-11-15
todayMarker stroke-width:5px,stroke:#0f0,opacity:0.5

Language and Compiler Features

Editor Productivity




Issue Analytics

  • State:open
  • Created a year ago
  • Reactions:194
  • Comments:20 (13 by maintainers)

github_iconTop GitHub Comments

DanielRosenwassercommented, Aug 25, 2022

Previous iteration plan is over at

DanielRosenwassercommented, Sep 21, 2022

A few updates:

  • While decorators have reached stage 3, we saw some behavior in the spec that needed to be discussed with the champions. Between addressing that and reviewing the changes, we expect decorators will be implemented in the next version.
  • Rather than shipping pieces of module resolution, we’d like to have a cohesive story on each of the above. That will likely be going to the next version as well.
  • Caching in .tsbuildinfo files is still in flux. We’ll likely have to decide on that only if we feel like we can get sufficient coverage.
Read more comments on GitHub >

github_iconTop Results From Across the Web

Announcing TypeScript 4.9 - Microsoft Developer Blogs
Our next release will be TypeScript 5.0 – but have no fear, we believe 5.0 should be pretty easy to adopt. Keep an...
Read more >
It was in the 4.9 iteration plan [1], and is now in ... - Hacker News
conaclos 2 days ago | parent | context | favorite | on: PR that converts the TypeScript repo from namespac... It was in...
Read more >
TypeScript v4.9 Beta: Introducing the new satisfies operator
Microsoft announced the beta release of TypeScript version 4.9 on ... According to the TypeScript iteration plan, the final release for TypeScript 4.9...
Read more >
Lee Robinson on Twitter: "TypeScript 4.9 is going to be *huge ... TypeScript 4.9 Iteration Plan · Issue #50457 · microsoft/TypeScript. This document outlines our focused tasks for TypeScript 4.9.
Read more >
Did TypeScript 4.9 add merging of array values in tsconfig or ...
Doesn't seem to be quite the same as what you mention, but I did just see this in the TypeScript 5.0 iteration plan:....
Read more >

github_iconTop Related Medium Post

No results found

github_iconTop Related StackOverflow Question

No results found

github_iconTroubleshoot Live Code

Lightrun enables developers to add logs, metrics and snapshots to live code - no restarts or redeploys required.
Start Free

github_iconTop Related Reddit Thread

No results found

github_iconTop Related Hackernoon Post

No results found

github_iconTop Related Tweet

No results found

github_iconTop Related Post

No results found

github_iconTop Related Hashnode Post

No results found