Earlier quoted context omitted.
Do you know of any that use JavaScript/typescript?
Here's the more popular dozen or so: https://github.com/collections/javascript-game-engines If you want to know about the really small indie ones that are less for actual use and more for just "I want to make a game engine" I would check out the various gamedev Discord and Reddit channels. There's always people showing off their work.
Yeah, I was thinking more terms of pico8 where you have the the editor which basically has everything included to make the game.