You said no-Lua, but since for many interested in this thread Lua's a non-problem, I'll pitch a disconcertingly under-hyped / under-noticed native (aka non-Electron) editor with Lua extension story (and many of its parts built on that plus its small C core) called TextAdept.

I'm still a happy camper on VSCode but if it ever begins to crumble/rot/overbloat (by subjective criteria), I'd hop onto that. Lua is (for my purposes here) no better/worse than JS/TS. Save for those darned 1-based array indexings!

LSP-capable too, last I heard, else it'd be a non-option for me in 2024. https://orbitalquark.github.io/textadept/