CustomDocument constructor
      
      CustomDocument({ 
    
    
- Uri? uri,
 - void dispose()?,
 
Implementation
factory CustomDocument({
  _i3.Uri? uri,
  void Function()? dispose,
}) =>
    CustomDocument._(
      uri: uri ?? _i6.undefined,
      dispose: dispose == null ? null : _i5.allowInterop(dispose),
    );