TypeScript 4.1 Iteration Plan #40124

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Daniel Rosenwasser (DanielRosenwasser)

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on Aug 18, 2020

This document outlines our focused tasks for TypeScript 4.1. Nothing is set in stone, but we will strive to complete them in a reasonable timeframe.

Date	Event
August 20th	TypeScript 4.0 Release
September 11th	Create 4.1 Beta (4.1.0) Build for Testing
September 15th	TypeScript 4.1 Beta Release
October 30th	Create 4.1 RC (4.1.1) Build for Testing
November 3rd	TypeScript 4.1 RC Release
November 13th	Create 4.1 Final (4.1.2) Build for Testing
November 17th	TypeScript 4.1 Final Release 🚀

Language Features

Recursive Conditional Types
Investigate Pedantic Flags
- undefined in index signatures
- --noImplicitOverride
Investigate Preventing Global Conflicts with Strict Environment Configuration
Investigate Key Augmentations in Mapped Types
Investigate ESM Interop
export * as default
Investigate WASM imports
JSX Factory Updates
Investigate /// Comments

Editor Productivity

Performance

Anticipated bug fixes and UX improvements for partial semantic mode
tsc Profiling Output Support
Investigate Slowdowns in Popular Libraries

Infrastructure

Improve Workflow for External Code Tests
Breaking Change Detection Scripts

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