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Re:Show HN: A SQL database implemented purely in TypeScript ... by cuddlecake on Monday September 28, 2020 @08:27AM (#24615868)
It's a new feature from TypeScript 4.1 (this version is yet in beta)

https://devblogs.microsoft.com/typescript/announcing-typescr...

Re:Show HN: A SQL database implemented purely in TypeScript ... by cjdell on Monday September 28, 2020 @09:25AM (#24616359)
Lots of new toys to play with in this release! They've also explained each new feature really well...