How to reference a local package in a project that is running in Docker container?

Question

I want to simultaneously work on two projects:

• Project A
• Project B (a package used in Project A)

I am developing project A in a docker container.

Is there a way I can use the local version of Project B inside of Project A? I want to be able to have any updates to Project B be reflected in Project A in realtime (if possible).

I tried using npm link, but found that it isn't possible to do so inside of a container.

Thanks.