Upgraded supported TypeScript version to v2.7.#3978

Merged

teverett merged 4 commits intoantlr:masterfrom aleppard:typescript-improvements

Feb 25, 2024

+207-69

Commits on Feb 23, 2024

Added object function properties.
Andrew Leppard
committed
Added yield*.
Andrew Leppard
committed
Upgraded to TypeScript v2.7.
Andrew Leppard
committed
Added another example.
Andrew Leppard
committed