These are the samples as used and demoed in my OpenTelemetry JS to the rescue! talk.
The demos show several stages (01-server... - 04-server...) of "instrumenting" a simple
Node.js application with OpenTelemetry.
The folder client-server shows the step-wise approach of how to create an actual
distributed trace for a client and a server application.
The API version of opentelemetry-js used in those samples is 1.0.2.