[2527] context.isClient and context.isServer deprecation warnings when not used

I have just upgrade nuxt to 1.0.0 in one of my projects and I am getting the following warnings every time a page is server side rendered (Both in the server console and on the client):

context.isClient has been deprecated, please use process.client instead.
context.isServer has been deprecated, please use process.server instead.

From my understanding from these release notes, (https://github.com/nuxt/nuxt.js/releases/tag/v1.0.0) I can still use the context.isClient property inside build.extend(), as this is said:

We also deprecated dev property inside build.extend() in flavour of isDev.

(Little side note, this should say 'in favour' instead of 'in flavour')

If what I think is correct, then I am not using these deprecated APIs in my code, but the warning as still appearing.

Could these warnings maybe be coming from a nuxt module that is still using the deprecated API? (Like what happens when a package you depend on is not using babel-present-env)