TypeScript 4.0

Announcing TypeScript 4.0 | TypeScript

What’s New?

• Variadic Tuple Types
• Labeled Tuple Elements
• Class Property Inference from Constructors
• Short-Circuiting Assignment Operators
• unknown on catch Clauses
• Custom JSX Factories
• Speed Improvements in build mode with --noEmitOnError
• --incremental with --noEmit
• Editor Improvements
  • Convert to Optional Chaining
  • /** @deprecated */ Support
  • Partial Semantic Mode at Startup
  • Smarter Auto-Imports
• Our New Website!
• Breaking Changes