This is built on the Lexical framework, which is exactly what you suggest - vanilla JS with optional React bindings. OP's project is an additional React-specifi

This is built on the Lexical framework, which is exactly what you suggest - vanilla JS with optional React bindings. OP's project is an additional React-specific layer on top of Lexical, and since it's concerned with rendering the editor UI it makes sense that it's UI rendering library specific.