Compatibility to Angular universal

[abelpuentes]

PR Checklist

Verify that you did the following:

• Opened an issue to track and discuss the problem you are trying to solve.
• Submitted the changes using a new branch in your fork of this repo.
• Added test for the changes and checked that code coverage didn't diminished if possible.
• Docs were updated using jsdoc style comments when necessary.

Describe what you did

Used variable window based on PLATFORM_ID, to avoid issues in projects using Angular Universal.

Is this a breaking change?

• Yes
• No

Other information

[abelpuentes]

@devconcept could you please check this pull request?

[abelpuentes]

@devconcept do you have any feedback?