TypeScript 3.7 Iteration Plan

[DanielRosenwasser]

This document outlines our focused tasks for TypeScript 3.7, 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
--------------|------------------------
August 28th | TypeScript 3.6 Release
September 27th| Create 3.7 Beta (3.7.0) Build for Testing
October 1st | TypeScript 3.7 Beta Release
October 18th | Create 3.7 RC (3.7.1) Build for Testing
October 22nd | TypeScript 3.7 RC Release
November 1st | Create 3.7 Final (3.7.2) Build for Testing
November 5th | TypeScript 3.7 Final Release 🚀

Work Items

Expected Work Items

• Language
  
  
  
  • Optional Chaining
  
  
  • Nullish Coalescing
  
  
  • Assertion Signatures
  
  
  • Recursive Type References
  
  
  • ECMAScript Private Fields
  
  
  • Top-Level await
  
  
  • Compiler
  
  
  • --declaration and --allowJs
  
  
  • --declaration and --isolatedModules
  
  
• Editor Features
  
  
  
  • Call hierarchy
  
  
  • Polishing auto-import functionality (fixing issues, adding functionality)
  
  
  • Project references improvements
    
    
    
    
    
    • Opening unbuilt project reference solutions (for fresh git clone scenarios)
    
    
    
    • Delayed loading of projects (improving performance and memory consumption)
    
    
    
  
  
• Performance
  
  
  
  • Rolling Issues
  
  
  • Experiments in Perf
  
  
  • Customer Development/Investigation
  
  
  • Get performance data from TSServer crawler work.
  
  
• Infrastructure
  
  
  
  • Automated testing infrastructure for the language service on real world code
  
  
  • Migrate repo to ESLint
  
  
  • Investigate smaller package publish
  
  
  • Dual-publishing @types on GitHub package registry
  
  
• Website and Documentation
  
  
  
  • New Handbook
  
  
  • Redesign
  
  

Deferred Work Items

None from planning meeting

---

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)

• Language

  • Type System Innovation
    
    
    
    • Assertion Signatures
    
    
    • Recursive Type References
    
    
  • Standards Conformance
    
    
    
    • ECMAScript Private Fields
    
    
    • Nullish Coalescing
    
    
    • Optional Chaining
    
    
    • Top level await
    
    
    • Transition plan for class fields
    
    
• Compiler
  
  
  
  • --declaration and --allowJs
  
  
  • --declaration and --isolatedModules
  
  
  • Investigate compiler plugin API
  
  
• Infrastructure
  
  
  
  • Migrate repo to ESLint
  
  
  • Investigate smaller package publish
    
    
    
    
    
    • Might have ideas for removing unnecessary files.
    
    
    
  
  
  • Dual-publishing @types on GitHub package registry
    
    
    
    
    
    • Today, types packages are automatically fetched to power IntelliSense in VS and VS Code.
    
    
    
    • GitHub now provides its own registry.
    
    
    
    • We want to ensure that there is some level of redundancy.
    
    
    
  
  
• Editor Productivity
  
  
  
  • Call hierarchy
  
  
  • Polishing auto-import functionality (fixing issues, adding functionality)
    
    
    
    
    
    • Just expect more to come in.
    
    
    
  
  
  • Project references improvements
    
    
    
    
    
    • Opening unbuilt project reference solutions (git clone scenarios)
    
    
    
    • Delayed loading of projects (improving performance and memory consumption)
    
    
    
  
  
• Website and Documentation
  
  
  
  • New Handbook
    
    
    
    
    
    • Finishing up chapters (Enums and Modules) in core handbook
    
    
    
  
  
  • Redesign
    
    
    
    
    
    • Core messaging
    
    
    
    • Samples
    
    
    
    • New community page for meetups/conferences
    
    
    
    • Integrating the new handbook into the site
    
    
    
    • Ensure full accessibility
    
    
    
  
  
• Stability
  
  
  
  • TSServer crawler
    
    
    
    
    
    • Currently takes a fixed set of repos
      
      
      
      
      
      
      
      • That's fine.
      
      
      
      
    
    
    
  
  
• Performance
  
  
  
  • Rolling Issues
  
  
  • Experiments in Perf
    
    
    
    
    
    • Can we incrementally bind, reuse checking results, etc.?
    
    
    
  
  
  • Customer Development/Investigation
    
    
    
    
    
    • Establish hypotheses
    
    
    
    • Validate/invalidate
    
    
    
    • Concept/value testing
    
    
    
    • Implementation
    
    
    
  
  
  • Get performance data from TSServer crawler work.
  
  

[AnyhowStep]

Nullish Coalescing

Links to "Top Level Await" issue

[ahejlsberg]

@DanielRosenwasser Fixed link to Nullish Coalescing and added Recursive Type References.

[DanielRosenwasser]

Thanks @AnyhowStep and @ahejlsberg. Additionally, I've made a change to the schedule. We will be reducing the feature period given that there's a convenient opportunity to align with Visual Studio, and we feel like the planned features are all individually in a good place.

[j-oliveras]

Someone should move --declaration and --isolatedModules on roadmap to version 3.7 (currently on 3.6).

[vvakame]

Does Auto-inserted await for completions and Call Hierarchy support on roadmap move to v3.7? It's not included in v3.6.3. right?

[anymost]

So when will TypeScript 3.7 RC Release come out, looks It delay for 3 days.

[DanielRosenwasser]

It went out yesterday. Just published via GitHub.

[anymost]

Thanks a lot, I'll try it.

[ExE-Boss]

Can we still get #34065 into this?

[krvajal]

today is the day?

[motss]

I guess so. Hurray!!! 🎉🎊

[samwx]

Can't wait!!

[DanielRosenwasser]

Hey everyone - as you've all likely heard, TypeScript 3.7 is now available!

As a few follow-ups:

• We will likely have a 3.7.4 servicing release.
• The Iteration Plan for TypeScript 3.8 is also now available: https://github.com/microsoft/TypeScript/issues/34898
• The PRs asked about above will likely make it into 3.8.

Thanks everyone!