TypeScript 4.6 Iteration Plan

[DanielRosenwasser]

This document outlines our focused tasks for TypeScript 4.6. 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
November 16th	TypeScript 4.5 Release
January 14th	Create 4.6 Beta (4.6.0) Build for Testing
January 18th	TypeScript 4.6 Beta Release
February 4th	Create 4.6 RC (4.6.1) Build for Testing
February 8th	TypeScript 4.6 RC Release
February 18th	Create 4.6 Final (4.6.2) Build for Testing
February 22nd	TypeScript 4.6 Final Release 🚀

Language and Compiler Features

• Narrowing Destructured Discriminated Unions
• Investigate Contextually Typed And Compatible Operator
• lib.d.ts Updates
• Bug Fixing

Editor Productivity

• Object Member Snippet Completions
• Provide Grammar Errors in JavaScript Files
• Investigate IPC Communication for TSServer
• Enable Automatic Type Acquisition in Web Contexts
• Investigate Workspace Support in Web Contexts
• Welcome Page Contributions in Visual Studio Code
• Easy Run/Debug for Loose TypeScript Files

Performance

• Investigate Outstanding Performance Issues
• Transfer ts-analyze-trace to Microsoft
• Supporting Additional Trace Points
• Profiling/Tracing Mode Improvements
• Investigate Tooling for JIT Deoptimizations

Infrastructure

• Migrate to Modules
• Expand Perf Suite
• Fuzzer Improvements and Addressing Crashes
• Improving User Suite Reports

Website

• Migrate to Static Web Apps
• Investigate Playground as a VS Code Extension

DefinitelyTyped

• @types/web Integration and Testing

[daKmoR]

iirc support for Nodes package exports was planned for TypeScript 4.5 but it did not happen/work out... any plan to add it to 4.6?

Sort of clarification of this comment by @RyanCavanaugh

@jaydenseric we're committed to shipping this as soon as it's ready; ideally 4.6, but the possibility of a further slip is always present

[danielrentz]

Why aren't there any updates on the roadmap wiki page anymore?
https://github.com/microsoft/TypeScript/wiki/Roadmap

[DanielRosenwasser]

@danielrentz I have to update that, sorry!

[DanielRosenwasser]

@typescript-bot create release-4.6

[typescript-bot]

Heya @DanielRosenwasser, I've started to create the release-4.6 branch for you. Here's the link to my best guess at the log.

[danielrentz]

Thank you Daniel :)

[rishipal]

Typically the npm release has a corresponding TypeScript release with the same tag. Why is there no "TypeScript 4.6 Beta Release" under https://github.com/microsoft/TypeScript/releases?

[DanielRosenwasser]

Done https://github.com/microsoft/TypeScript/releases/tag/v4.6-beta