Repository navigation
TypeScript 4.8 Iteration Plan #49074
Description
This document outlines our focused tasks for TypeScript 4.8. 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 |
|---|---|
| May 24th | TypeScript 4.7 Release |
| June 17th | Create 4.8 Beta (4.8.0) Build for Testing |
| June 21st | TypeScript 4.8 Beta Release |
| August 5th | Create 4.8 RC (4.8.1) Build for Testing |
| August 9th | TypeScript 4.8 RC Release |
| August 19th | Create 4.8 Final (4.8.2) Build for Testing |
| August 23th | TypeScript 4.8 Final Release 🚀 |
Language and Compiler Features
- ECMAScript Decorators
- Improved Inference for
inferTypes in Template String Types - Investigate Contextually Typed And Compatible Operator
- Continue Investing in Type Annotations Proposal
- Investigate
--isolatedDeclarationEmit Mode - Improve Conformance for Arrow Functions in Conditional Expressions
- Investigate Narrowing Generics By Truthiness
- Investigate
--watchIssues on Checkouts lib.d.tsUpdates
Editor Productivity
- Prototype Virtual File System Support in TSServer
- Investigate Cancellation in Browser Contexts
- Prototype Automatic Type Acquisition in Web Contexts
- Provide Walkthroughs in Visual Studio Code Welcome View
- Easy Run/Debug for Loose TypeScript Files
- Investigate TS Server Plugins on the Web
Performance
- Investigate Tooling for JIT Deoptimizations
- Investigate Outstanding Performance Issues
- Enrich TS Server Tracepoint
Infrastructure
- Determining Module Migration and Shipping Strategy
- Fuzzer Improvements and Addressing Crashes
- TSServer Performance Testing Infrastructure
- Expand Perf Suite
Website
Reacted by Rob Palmer, whzx5byb, electron-space, Maxime Richard, ExE Boss, why520crazy, Bert Verhelst, Kirill Groshkov, C. T. Lin, Hugo and 68 more
Reacted by NarupoomChaisawat
Reacted by electron-space, South Drifter, Esdras Amora, Narcis Bugeag, Juraj Mäsiar, Roger Padilla, Julian Meinking, Clément Nerma, Nikolay, qinxiaosen_ccc and 16 more
Reacted by NarupoomChaisawat
Activity
ghiscoding commentedon May 18, 2022
I wonder when will any of the opened issues related to Scenario: Monorepos & Cross-Project References will ever be worked and/or looked into? I'd be really interested to see this one in particular #30235, to build with multi-threads, and it's been open for so long without any real tractions. Are there any plans short term? When should we expect any movements in Monorepo subjects from TypeScript team? When will TypeScript ever take advantage of multi-threaded compilations? I'm sure plenty of users would enjoy the perf boost when doing a build... Anywho, I'm still happy to see plenty of features ship every couple months, keep up the good work TS Team 🚀
JustFly1984 commentedon May 18, 2022
Please include #17002 Array.isArray with ReadonlyArray
Jack-Works commentedon May 27, 2022
please consider #49077!
arendjr commentedon May 29, 2022
Please consider addressing #37582 and #49083.
Eliav2 commentedon Jun 16, 2022
#10571 (Allow skipping generics) would be highly appreciated
DanielRosenwasser commentedon Jun 17, 2022
Ghislain B. (@ghiscoding) the multithreaded build issue is something that is unfortunately hard with the synchronous foundation we have. There is also some amount of work sharing between project builds that we would likely lose. On the flip side, we did land some great optimizations between
--build/--watch/--incrementalin time for the beta. You can try them in our current nightlies.DanielRosenwasser commentedon Jun 17, 2022
TypeScript Bot (@typescript-bot) create release-4.8
typescript-bot commentedon Jun 17, 2022
Heya Daniel Rosenwasser (@DanielRosenwasser), I've started to create the
release-4.8branch for you. Here's the link to my best guess at the log.kasperpeulen commentedon Jun 18, 2022
Daniel Rosenwasser (@DanielRosenwasser) Is there any chance that the satisfies operator will land in 4.8?
ostrowr commentedon Jun 21, 2022
Wesley Wigham (@weswigham) Looks like the beta release (https://github.com/microsoft/TypeScript/releases/tag/v4.8-beta) has a link to the 4.7 blog instead of the 4.8 blog. Excited for 4.8!
DanielRosenwasser commentedon Jun 21, 2022
Fixed, thanks!
dnalborczyk commentedon Jun 28, 2022
decoratorsupport is being listed in v4.9 of the roadmap: https://github.com/microsoft/TypeScript/wiki/Roadmap#49-november-2022, as well as for v4.8 in this iteration plan issue. which is correct? I assume v4.9 as there was no mention ofdecoratorsupport in the v4.8 beta release announcement: https://devblogs.microsoft.com/typescript/announcing-typescript-4-8-beta/.voxpelli commentedon Jul 5, 2022
Would love to get #49639 merged for TS 4.8 so that me and Jordan Harband (@ljharb) can stop getting complaints about not following the spec in our polyfill a when it's actually TS that isn't.
4 remaining items
typescript-bot commentedon Aug 6, 2022
Heya Daniel Rosenwasser (@DanielRosenwasser), I've started to update the version number on
release-4.8to4.8.1-rcfor you. Here's the link to my best guess at the log.crisbeto commentedon Aug 25, 2022
When is 4.8 final going to be released? The table above says that it was supposed to be on the 23rd.
wegry commentedon Aug 25, 2022
Kristiyan Kostadinov (@crisbeto) for typescript 4.7, at least, the date planned for the final was ~5 days earlier than the final release date.
DanielRosenwasser commentedon Aug 25, 2022
The plan changed for a release for today, in part due to the RC going out a little later.
DanielRosenwasser commentedon Aug 25, 2022
TypeScript Bot (@typescript-bot) bump release-4.8
typescript-bot commentedon Aug 25, 2022
Heya Daniel Rosenwasser (@DanielRosenwasser), I've started to update the version number on
release-4.8to4.8.2for you. Here's the link to my best guess at the log.DanielRosenwasser commentedon Aug 25, 2022
4.9 Iteration Plan is available at #50457
andrewbranch commentedon Sep 7, 2022
TypeScript Bot (@typescript-bot) bump release-4.8
typescript-bot commentedon Sep 7, 2022
Heya Andrew Branch (@andrewbranch), I've started to update the version number on
release-4.8to4.8.3for you. Here's the link to my best guess at the log.DanielRosenwasser commentedon Sep 23, 2022
TypeScript Bot (@typescript-bot) bump release-4.8
typescript-bot commentedon Sep 23, 2022
Heya Daniel Rosenwasser (@DanielRosenwasser), I've started to update the version number on
release-4.8to4.8.4for you. Here's the link to my best guess at the log.jkowalleck commentedon Sep 27, 2022
the NPMJS 4.8.4 release was flagged 2 hours ago - https://www.npmjs.com/package/typescript/v/4.8.4 ,
but no git tag "v4.8.4" was pushed to github, and no github release was flagged. Without a git tag it is hard to review the delta to v4.8.3
Daniel Rosenwasser (@DanielRosenwasser) was this indented behavior?
DanielRosenwasser commentedon Sep 27, 2022
The GitHub release is pending. For the future, you can take a look at our milestones view.