whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(List<String>? chains, List<String> methods, List<String> events)?)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( List<String>? chains,  List<String> methods,  List<String> events)?  $default,) {final _that = this;
switch (_that) {
case _RequiredNamespace() when $default != null:
return $default(_that.chains,_that.methods,_that.events);case _:
  return null;

}
}