TypeScript 3.8 Iteration Plan

TypeScript 3.8 Iteration Plan

TypeScript 3.8 Iteration Plan: 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.

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

TypeScript 3.8

Work Items

Expected Work Items

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
  • 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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