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

Equivalent to:

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

Source

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