When should context.bind be used?

[airhorns]

I'm trying to write some instrumentation for various websocket libraries for node.js, and struggling to figure out when context.bind should be used with various event emitters. Is there any guidance I can't find that explains when it should and shouldn't be used, and if not, would someone mind explaining?

Thanks!

[vmarchaud]

context.bind is similar to function.bind, it's used to manually set the opentelemetry context (where as the function.bind is used to set the this context) that will be used within the function that are you calling. It also handle binding to event emitters where the given context will be the one used for every .emit.
Also context.bind allows not to set a specific context in which case the current context will be manually set.
I would say that you generally don't need to do this because with newer nodejs version there is not much context loss left (which case the case before), async hooks/async local storage now generaly handle this for you.