TypeScript 3.8 Iteration Plan #34898

DanielRosenwasser · 2019-11-04T06:52:47Z

This document outlines our focused tasks for TypeScript 3.8, as well as some of the discussion that explains how/why we prioritized certain work items. Nothing is set in stone, but we will strive to complete them in a reasonable timeframe.

Dates

Date	Event
November 5th	TypeScript 3.7 Release
January 3rd	Create 3.8 Beta (3.8.0) Build for Testing
January 8th	TypeScript 3.8 Beta Release
January 31st	Create 3.8 RC (3.8.1) Build for Testing
February 4th	TypeScript 3.8 RC Release
February 14th	Create 3.8 Final (3.8.2) Build for Testing
February 18th	TypeScript 3.8 Final Release 🚀

Work Items

Expected Work Items

Compiler Features
Performance
Command Line Tooling
- downlevel-dts
Editor Productivity
- Investigate performance improvements
  - Cross-file Go-To-Definition Fixes
  - Investigate requesting refactorings less often
- Migration tooling investigation: Elicit feedback on...
  - Editor-Triggered .ts to .js Refactorings
  - Editor-Triggered Suggestions on Introducing a .ts File
- Refactorings
- Quick Fixes
  - Add declare Modifier to Class Property
- Call Hierarchy API
Infrastructure
- JIT deoptimization analysis
  - Find common deopts and fix them
- Performance Diffs on PRs
- GitHub Package Registry Publishing for @types.
- Pull Request Debt
- TSServer Crash Dump Infrastructure
Documentation

Deferred Work Items

Interactive diagnostics

Planning Meeting Notes

Motivations

Bug backlog
Goals and current 6-month roadmap
GitHub user feedback (👍s)
Feedback from customer interviews, social media, past iteration plans
Visual Studio and Visual Studio Code feedback, as well as new functionality demands
Actionable PRs (need to make a call)

Notes

Compiler Features
- New Export Forms
- Top-Level Await
- Private Fields (Flagged?)
- Address anticipated feedback from 3.7
- Lib Updates?
- Declaration emit
  - UX
  - Performance
- Bug Squashing!
  - Debt reduction for addressing bugs
  - Awareness of release
Performance
- Investigate async file-writing
- Plugin Investigation: async plugins?
- Declaration emit
- updateGraph details in TSServer responses
  - Provides easier analysis for TSServer performance problems.
  - Requires synchronization with editor teams.
- Investigate recompilation speed
  - tsc --watch isn't as fast as gulp-tsb (because it's less accurate). Is there a fast and loose mode?
Tooling
- dts-downlevel
  - Several library authors have explained that it is hard to support older versions of TypeScript while using the latest.
  - .d.ts files keep artifacts of your version of TS even when "uninteresting" for older versions of TS.
  - Goes back to long-standing request (e.g. readonly properties broke earlier versions of TS)
  - Enabled by typesVersions
- Editor Productivity
  - Interactive diagnostics ❌
    - Probably won't be able to prioritize during this release.
  - Investigate performance improvements
    - Cross-file go-to-definition
      - Noticed in partner team codebases
    - Request refactorings less often
  - Investigate automatic editor migrations
    - Do existing tools solve the problem?
    - Can we do a good job in the editor?
      - CD & App building
  - Leave room open to refactoring discoverability and triggers.
    - Refactorings without spans might need to be triggerable.
  - Refactorings
    - Extract to constant should come first.
    - Refactoring for convert to template string.
Infrastructure
- Triage & Scheduling
- Weekly Status Mails for Bug Reduction
- JIT deoptimization analysis
  - VS Code extension
  - CI integration (e.g. @typescript-bot what deoptimizes?)
    - Will be learning here from general perf investigations. Not certain if this will be useful.
- extendedDiagnostics diffs on PRs
- GitHub Package Registry publishing for @types.
- Expand version list for crash dumps
  - We should be looking at beta and RC.
Documentation
- Handbook
- Website
- Contributing Guidelines

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mohsen1 · 2019-11-12T15:47:13Z

I see "async?" for compiler plugins. That should be the case, at least for GraphQL. GraphQL type generation is currently async because it can be dependent on a network request to the API endpoint for introspection.

dragomirtitian · 2019-12-17T13:09:15Z

@DanielRosenwasser will you be adding the feature list to the Roadmap? It is very useful to have a single spot with all major features in each version.

rusco · 2019-12-23T11:38:57Z

@DanielRosenwasser It should be February 2020 in the roadmap ! 🐛

https://github.com/microsoft/TypeScript/wiki/Roadmap#38-february-2019

Jack-Works · 2019-12-31T01:00:59Z

Hope to get any new reviews for #35148 I've fully rewritten it 🧐

Kingwl · 2020-01-03T06:53:12Z

JIT deoptimization analysis

more info? it's a bit confusing🤔

markusjohnsson · 2020-01-17T12:19:42Z

I remember seeing 3.8 on the Roadmap, but now it says Orta edited this page on 5 Nov 2019, why was it reverted?

orta · 2020-01-17T14:07:10Z

It might not have been added to the page in the TypeScript-wiki repo and got overwritten at some point, shame

ExE-Boss · 2020-01-19T11:33:55Z

Can we get #36263 into TypeScript 3.8?

w0rp · 2020-01-24T09:36:45Z

If someone could update the wiki again, I would appreciate it. I have a habit of checking the roadmap wiki page now and again to look for changes I have to plan for, if I want the latest stuff. 😄

DanielRosenwasser · 2020-01-24T18:03:27Z

Some CI task erased my work on the wiki via a force push, so please be patient as we figure that one out. Sorry for the confusion there.

orta · 2020-01-24T18:33:12Z

I've added it back with microsoft/TypeScript-wiki#246

w0rp · 2020-02-02T14:56:24Z

Thanks a lot, I appreciate that.

joscha · 2020-02-05T04:00:05Z

with the new import type syntax (I can't actually see where this is mentioned here) in 3.8, we do need to update preProcessFile to be able to resolve imports properly (e.g. produce tests for https://github.com/microsoft/TypeScript/blob/master/src/testRunner/unittests/services/preProcessFile.ts and implemement fixes) - is this already tracked somewhere?

David-Else · 2020-02-06T12:12:53Z

Bit of a delay with TypeScript 3.8 RC... coming soon?

LittleStoney · 2020-02-12T06:10:54Z

Thanks

DanielRosenwasser · 2020-02-18T21:04:33Z

Just as a heads up, because the RC moved out a bit, and because of Presidents Day yesterday, we're aiming for Thursday for the final release.

DanielRosenwasser · 2020-02-28T21:05:25Z

@typescript-bot bump release-3.8

typescript-bot · 2020-02-28T21:05:30Z

Heya @DanielRosenwasser, the branch 'release-3.8' had a package.json, but it didn't seem to be valid JSON.

DanielRosenwasser · 2020-02-28T21:05:56Z

Bad bot, I hate you.

DanielRosenwasser · 2020-02-28T21:17:36Z

@typescript-bot bump release-3.8

typescript-bot · 2020-02-28T21:17:45Z

Heya @DanielRosenwasser, I've started to update the version number on release-3.8 to 3.8.21 for you. Here's the link to my best guess at the log.

DanielRosenwasser · 2020-02-28T21:21:15Z

Good bot, you and I seem to have a good sense of how versioning works.

DanielRosenwasser · 2020-02-28T21:21:31Z

@typescript-bot bump release-3.8

typescript-bot · 2020-02-28T21:22:32Z

Heya @DanielRosenwasser, I've started to update the version number on release-3.8 to 3.8.3 for you. Here's the link to my best guess at the log.

DanielRosenwasser · 2020-03-04T19:57:50Z

The 3.9 Iteration Plan is out at #37198, thanks all!

DanielRosenwasser added the Planning Iteration plans and roadmapping label Nov 4, 2019

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Collaborate with TypeScript on 2020 roadmap microsoft/vscode#84102

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[Suggestion] Allow @ts-ignore at the end of the same line #20111

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[Discuss] Lint rule to enforce I prefix for typescript interfaces elastic/kibana#51674

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Private named instance fields #30829

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Private fields inside strings microsoft/vscode#87208

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Roadmap does not mention version 3.8 microsoft/TypeScript-wiki#245

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TypeScript 3.8 Iteration Plan #34898

TypeScript 3.8 Iteration Plan #34898

DanielRosenwasser commented Nov 4, 2019 •

edited by RyanCavanaugh

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DanielRosenwasser commented Mar 4, 2020

TypeScript 3.8 Iteration Plan #34898

TypeScript 3.8 Iteration Plan #34898

Comments

DanielRosenwasser commented Nov 4, 2019 • edited by RyanCavanaugh Loading

Dates

Work Items

Expected Work Items

Deferred Work Items

Planning Meeting Notes

Motivations

Notes

mohsen1 commented Nov 12, 2019

dragomirtitian commented Dec 17, 2019

rusco commented Dec 23, 2019

Jack-Works commented Dec 31, 2019

Kingwl commented Jan 3, 2020 • edited Loading

markusjohnsson commented Jan 17, 2020

orta commented Jan 17, 2020 • edited Loading

ExE-Boss commented Jan 19, 2020

w0rp commented Jan 24, 2020

DanielRosenwasser commented Jan 24, 2020 • edited Loading

orta commented Jan 24, 2020

w0rp commented Feb 2, 2020

joscha commented Feb 5, 2020

David-Else commented Feb 6, 2020

LittleStoney commented Feb 12, 2020

DanielRosenwasser commented Feb 18, 2020

DanielRosenwasser commented Feb 28, 2020

typescript-bot commented Feb 28, 2020

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DanielRosenwasser commented Mar 4, 2020

DanielRosenwasser commented Nov 4, 2019 •

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