In case you are an Emacs user doing frontend development with TypeScript and React, there is tsx-mode https://github.com/orzechowskid/tsx-mode.el
In case you are an Emacs user doing frontend development with TypeScript and React, there is a new major mode for TSX development: tsx-mode. It is a promising project. It uses tree-sitter for font-lock (syntax highlighting). My setup using use-package can be found here and here. I also added it to my Doom Emacs config: see this and this.