ZoneCallback bindCallback(dynamic f(), {bool runGuarded: true})

Equivalent to:

 ZoneCallback registered = registerCallback(f);
 if (runGuarded) return () => this.runGuarded(registered);
 return () => this.run(registered);

Source

ZoneCallback/*<R>*/ bindCallback/*<R>*/(
    /*=R*/ f(), { bool runGuarded: true });