observe property
      
      void Function([PerformanceObserverInit?])
      get
      observe
      
    
    
    
Implementation
void Function([_i3.PerformanceObserverInit?]) get observe =>
    ([_i3.PerformanceObserverInit? p0]) => _i4.callMethod(
          _i4.getProperty(
            this,
            'observe',
          ),
          r'call',
          [
            this,
            p0 ?? _i6.undefined,
          ],
        );
      
      set
      observe
      (void value([PerformanceObserverInit?])) 
      
    
    
    
Implementation
set observe(void Function([_i3.PerformanceObserverInit?]) value) {
  _i4.setProperty(
    this,
    'observe',
    _i4.allowInterop(value),
  );
}