nx: Workspace Schematics: importing a TS file outside the "tools" directory causes a TS error

Expected Behavior

I should be able to import a TS file from an app or lib into my custom workspace schematic and use it.

Current Behavior

When I try importing a file from an app or lib into my custom schematic, I get a 'rootDir' is expected to contain all source files TS error.

Failure Information (for bugs)

Steps to Reproduce

The specific steps to reproduce are as follows:

1. Create a new workspace via npx create-nx-workspace@latest schematics-playground
2. Select Angular as the type of workspace
3. During the process it asks for the name of the first app, set it to default
4. Create a test schematic via ng g workspace-schematic test
5. Inside the index.ts file for that schematic, import the app.module.ts for the default app that was generated (or really any file that requires traversal outside of the tools directory)
6. Run the schematic via ./node_modules/.bin/nx workspace-schematic test

Context

nx report

  @nrwl/angular : 9.0.2
  @nrwl/cli : 9.0.2
  @nrwl/cypress : 9.0.2
  @nrwl/eslint-plugin-nx : Not Found
  @nrwl/express : Not Found
  @nrwl/jest : 9.0.2
  @nrwl/linter : Not Found
  @nrwl/nest : Not Found
  @nrwl/next : Not Found
  @nrwl/node : Not Found
  @nrwl/react : Not Found
  @nrwl/schematics : Not Found
  @nrwl/tao : 9.0.2
  @nrwl/web : Not Found
  @nrwl/workspace : 9.0.2
  typescript : 3.7.5

Reproduction A minimal reproduction of the error can be found here. This was generated using the exact steps outlined in “Steps to Reproduce”. Just install dependencies and run the test schematic via nx workspace-schematic test.

Failure Logs

In the repro I am trying to import the AppModule from apps/default/src/app/app.module.ts into my schematic at tools/schematics/test/index.ts and it results in this error:

apps/default/src/app/app.module.ts:4:30 - error TS6059: File '/Users/Garve/projects/schematics-playground/apps/default/src/app/app.component.ts' is not under 'rootDir' '/Users/Garve/projects/schematics-playground/tools'. 'rootDir' is expected to contain all source files.

4 import { AppComponent } from './app.component';
                               ~~~~~~~~~~~~~~~~~

tools/schematics/test/index.ts:4:27 - error TS6059: File '/Users/Garve/projects/schematics-playground/apps/default/src/app/app.module.ts' is not under 'rootDir' '/Users/Garve/projects/schematics-playground/tools'. 'rootDir' is expected to contain all source files.

4 import { AppModule } from '../../../apps/default/src/app/app.module';
                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Found 2 errors.

Other

For reference, here is the resulting structure of the dist folder when I run the schematic and get the error:

Almost positive the error is coming from this function, because I tried running the tsc -p tools/tsconfig.tools.json command myself and got the same error.