A callback method that performs custom clean-up, invoked immediately before a directive, pipe, or service instance is destroyed.
A callback method that is invoked immediately after the default change detector has checked the directive's data-bound properties for the first time, and before any of the view or content children have been checked. It is invoked only once when the directive is instantiated.
After the enter/leave animation finishes, publish the banner height as a CSS custom property
When visible, this banner sets --mj-connectivity-banner-height on so that any position:fixed element referencing the shell header offset (e.g. app-switcher mobile dropdown) can account for the banner.