Error: Some of the library <YOUR LIBRARY> dependencies have not been built yet. Please build these libraries before: -testing

We are getting this error: Error: Some of the library "my-library" dependencies have not been built yet. Please build these libraries before: -testing

We have just upgraded to Angular 8 and are having an issue with our build.

We have two libraries generated by the Nrwl schematics (in Angular 7) within the same project. They are “my-library” and “testing”.

“testing” is a library that contains nothing but stubs for Angular components that exist in “my-library”. We build this library separate and place the build files in “my-library’s” distribution folder. This is so we can have the following pattern in our other applications.

   import { myComponent } from "@abc/my-library"  // for components
   import { myComponentStub } from "@abc/my-library/testing"  // for testing

Our dist folder structure looks like this.

     dist > 
        @abc >
             my-library >
                 testing > // testing directory
                 package.json
                 .....                               

We never had an issue with this error until we upgraded to angular 8 using Nx and tried to build.

The error shows up when we do ng build my-library.

“Testing” is not a dependency used by “my-library” directly. But, the spec files within the library do.

They reference the stubs like so: Import { myComponentStub } from @abc/testing mapped through the jest.config.

jest.config.js

   ...
  moduleNameMapper: {
    "@abc/testing": "<rootDir>../../libs/testing/src/index.ts",
  }, 

The issue might lie in these test imports. The build might be looking for “@abc/testing” at dist > @abc > testing.

Prior versions of Angular “ng build” didn’t care about the spec file and their dependencies. Seeing this error is something only found in the Nx repo during a google search (angular-package.test.ts). I thought I would ask you.

Any idea how to resolve this?