Is there an available Typescript implementation with open source ?
There is https://www.npmjs.com/package/fhir-kit-client which has early Typescript support. See also Open Source Implementations - FHIR - Confluence for other listings.
Iām not aware on any more then listed on the above confluence link. An alternative would be to ask the question also in zulip javscript stream: FHIR Community
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