Which @angular/* package(s) are relevant/releated to the feature request?

router

Description

I have a piece of code that gets invoked by user with router as a parameter.
In that code I subscribe to router events.
If an app is minified, constructor names of events are obfuscated and then I need to do some naive checking like

function isNavigationEnd(event: Event): event is NavigationEnd {
    return event["constructor"]["name"] === RouterEvents.NAVIGATION_END
        || ("id" in event
            && typeof event["id"] === "number"
            && !!event["url"]
            && "urlAfterRedirects" in event
            && !!event["urlAfterRedirects"]
            && objectKeys(event).length === 3);
}

I am not so familiar with angular.
The issue I currently have is that I do some action in RouteConfigLoadStart and keep a reference to it
and I clean that reference in NavigationCancel or NavigationEnd
Now for some reason NavigationEnd or NavigationCancel never happens and references keep growing when I enter the RouteConfigLoadStart.
If event constructor names would be preserved I would know which event I am currently working with and could easier do the logic.
Keep in mind that my piece of code is external to the angular app, and it gets called with router as a parameter, so I am not in an non obfuscated environment of the app.

Proposed solution

Add a type field to the event or preserve name of its constructor.

Alternatives considered

I am using an alternative to do the naive checking but some events have same fields and then it could match more events than it should.