This document outlines our focused tasks for TypeScript 3.9, 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.

Work Items

Expected Work Items

• Stability
  • Eliminate crashes
    • Address compiler-bound crashes first, typically impact the LS too.
    • Assign priorities to crashes from telemetry and fuzzing
    • Compiler team addresses work items
  • Investigate better TSServer logging for easier issue reports
• Performance
  • Investigative
    • Work with users
  • Improve build times for popular libraries
    • Giant unions (MUI and styled-components)
  • Update Perf Suite
    • Current Compiler
    • Code using popular libraries
  • Parallelized --build mode for project references
  • Lazy-loading projects in preview tabs
• Infrastructure
  • Moving to modules
    • Helps us catch module issues sooner
    • Eventually can be the basis of solving package size issues
  • Pull Request Debt
  • Automate more release activities
• Compiler work
  • The awaited type
  • Live bindings for getters
  • lib.d.ts Updates
  • Bug Squashing!
• Editor Productivity and Language Service
  • VS Code Priority bugs
  • Investigate Discoverability for Refactorings/Quick Fixes
  • Switch ATA to GitHub Package Registry
    • Tentative: blocked on un-authenticated downloads
• Command Line Tooling
  • downlevel-dts
    • Move to Microsoft organization
    • Set out policies/contribution guidelines
    • Provide documentation and workflow guidance
• Documentation
  • Handbook
  • Website
  • Clarify Contributing Guidelines