Switches client code from JS to TS

[walmazacn]

Description

Changes proposed in this pull request:

• switches client code from JS to TS

Related issue(s)

Resolves #3791

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

✅ walmazacn
✅ JohannesDoberer
❌ ndricim-rr
_{You have signed the CLA already but the status is still pending? Let us recheck it.}