You can use our typescript client for everything not only for Schemas. Here is a section that has examples on how to use it https://docs.tigrisdata.com/typescript/. Please let us know if anything is confusing.
The native Javascript SDK is on our roadmap. In the meantime if you would like you can generate Javascript client using openapi generator such as https://blog.logrocket.com/generating-integrating-openapi-se...
We would be happy to accept your contribution.