* First batch of strictNullChecks

* Remove undefined

* Check an alternative solution

* Fix strict nullChecks

* Low hanging strictNullChecks

* Fixing strict nulls issues and more

* Minor change

* fixed unit test

* Fix feedback

* Update public/vendor/ansicolor/ansicolor.ts

Co-Authored-By: Dominik Prokop <dominik.prokop@grafana.com>

* Update public/vendor/ansicolor/ansicolor.ts

Co-Authored-By: Dominik Prokop <dominik.prokop@grafana.com>

* Update public/vendor/ansicolor/ansicolor.ts

Co-Authored-By: Dominik Prokop <dominik.prokop@grafana.com>

* Fix build errors