It has quite an awkward way of being distributed. If you google for standalone TypeScript language services you'll find unofficial ones. Deno's is much simpler. Maybe they should pioneer this.

Edit: Actually this is the first result, I hadn't tried those exact terms. It's a bit hairy though, which is why the unofficial typescript-language-server npm package wraps it. https://github.com/microsoft/TypeScript/wiki/Standalone-Serv...