Schema property inside GraphQLModule object is not assignable when it contains federation directives like @key

i was trying to do something like this:-

const {schema} = module;

Module is a graphQLModule, in which typedefs has @key attribute (Apollo Federation way).

At this statement it throws error:- Unknown directive "key"

Earlier i was using 0.7.7 version of @graphql-modules/core, @graphql-modules/di, then i upgraded the versions to 0.7.17, but still the issue didn't go away.

Or is it the expected behaviour?