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>If it weren't for the oddness of the language, Lua would be a perfect fit. Near-C speeds, super flexible, no recompiles.

True.

But there are also other dynamic languages that can go as fast as LuaJIT and of course faster than V8: Common Lisp and some Scheme implementations.

Both are very elegant languages, moreso than Lua (which is very peculiar.)

However, for the goals of an editor, my choice would be Free Pascal with Lazarus. It is already complete for cross-platform UI deployment. And compiled code is really fast.

Check out Textadept. It's an editor written largely in Lua.

or Howl

I love Lua but VSCode is mostly written in TypeScript so you get a fair number type checks.

> embedded browser+DOM

And also Node.