whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? internal(
    1. GlobalOptions globalOptions,
    2. String cacheDir,
    3. bool? color
    )?,
})

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( GlobalOptions globalOptions,  String cacheDir,  bool? color)?  internal,}) {final _that = this;
switch (_that) {
case _GlobalPubOptions() when internal != null:
return internal(_that.globalOptions,_that.cacheDir,_that.color);case _:
  return null;

}
}