when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String? label,
    2. String? ref,
    3. String? sha,
    4. GithubUserModelRef? user,
    5. GithubRepositoryModelRef? repo,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(
          String? label,
          String? ref,
          String? sha,
          @refParam GithubUserModelRef? user,
          @refParam GithubRepositoryModelRef? repo)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _GithubPullRequestHeadValue():
      return $default(
          _that.label, _that.ref, _that.sha, _that.user, _that.repo);
    case _:
      throw StateError('Unexpected subclass');
  }
}