BDo you fix this question 
NCould you share your setup files for the backend and frontend?
NI think the problem may be importing from a different package using a relative import but not having done any other setup around it
NIn the web project tsconfig, “include” that relative file to tell typescript to check it
NThat’s likely the simplest thing and I think should work
NThe more complete way might be to leverage workspaces fully and add the api as a dependency of the web project, then import the type by the package name. There would be more to do though in terms of exposing the types from the api package
Ntsconfig include has worked for me with Nx and is simpler