stackblitz requires to install optional dependencies

[satanTime]

Description of Bug

My library has several optional dependencies. The dependencies shouldn't be present at all.
Despite that stackblitz forces to install the dependencies and their dependencies, what is a bit strage.

Steps to Reproduce

1. Go to https://stackblitz.com/github/ng-mocks/examples/tree/bug?file=package.json
2. Wait
3. See error

Expected Behavior

Because these dependencies are optional, a require call should throw an error, or return undefined and let the library solve the situation.

Screenshots/Screencast

an optional dependency is handled like that:

try {
  const jestCircus: any = require('jest-circus/build/state');
  if (jestCircus) {
    // some logic
  }
} catch (e) {
  // no dependency, therefore nothing to do
}

https://github.com/ike18t/ng-mocks/blob/master/libs/ng-mocks/src/lib/common/ng-mocks-stack.ts#L7-L16

[kc0tlh]

@satanTime, I was able to open your repo in our new VS Code editor without encountering the error you mention in Step 3. I'm going to preliminarily mark this issue as resolved, but feel free to comment & re-open if you are still experiencing the optional deps issue!