Regression: project is not working anymore from 6.0.8 -> 6.1.0 (in lerna monorepos)

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Command (mark with an x)

- [x] all

Repro steps

Our angular/cli project ist located as one package of a larger lerna monorepo. We also make use of yarn workspaces, so all (or most) dependencies are hoisted within one single root node_modules folder. The resulting structure is something like

- node_modules <-- angular dependencies installed here
  - @angular
    - cli
    - core
    - ...
- packages
  - angular-app
    - package.json <-- angular dependencies defined here
    - src
    - ....
- package.json <-- no angular dependencies defined here

this line now (as of 6.1.0) prevents the project from working (at all) because relativePotential.startsWith('..') === true because in our structure relativePotential = ../../node_modules/@angular/core/package.json

everything was working fine with 6.0.8

The log given by the failure

You seem to not be depending on “@angular/core” and/or “rxjs”. This is an error.

Desired functionality

I can work on my angular project with latest versions of everything

[alexeagle]

Added to the top of our backlog

[ptitjes]

@alexeagle, @hansl, could we also have the fix on 6.2.x please? Moving to 7.0.0-rc* creates other problems with dependencies that are not ready for 7.0…