RT TypeScript
TypeScript 4.2 is now out with
✔ Smarter Type Aliases
✔ Non-Trailing [...rest]s in Tuple Types
✔ Stricter Checks
✔ The "Declare Missing Function" Quick Fix
and more! Try it today!
https://devblogs.microsoft.com/typescript/announcing-typescript-4-2

https://twitter.com/typescript/status/1364339507517038592