How to get token count in spfx framework?

Does anyone have an idea on how to obtain the token count of my prompt in SharePoint SPFx? I’m using the SPFx framework with React.js and TypeScript. Additionally, I don’t have any Node.js or backend server. I’ve tried several libraries such as js-tiktoken, tiktoken, gpt-3-encoder, gpt-4-encoder, but none of them seem to work. Any suggestions?

I have not yet tested it, but Microsoft also has a JavaScript/TypeScript implementation of the tokenizer based on the Tiktoken reference implementation. It’s available at npm as @microsoft/tiktokenizer.

I try it already that it is also used server side scripting.