when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(int? id, String? body, String? previousBody, String? authorAssociation, String? commitId, String? sha, String? state, int? reviewId, GithubTimelineEvent event, @jsonParam GithubUserModel? user, @jsonParam GithubUserModel? from, @jsonParam GithubUserModel? to, @jsonParam GithubProjectModel? project, @jsonParam GithubMilestoneValue? milestone, @jsonParam GithubReactionValue? reaction, @jsonParam GithubIssueModel? issue, @jsonParam GithubPullRequestModel? pullRequest, @jsonParam GithubLabelValue? label, ModelUri? url, ModelUri? commitUrl, ModelUri? htmlUrl, ModelUri? issueUrl, ModelUri? links, ModelUri? pullRequestUrl, ModelTimestamp createdAt, ModelTimestamp updatedAt, bool fromServer,))

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(
          int? id,
          String? body,
          String? previousBody,
          String? authorAssociation,
          String? commitId,
          String? sha,
          String? state,
          int? reviewId,
          GithubTimelineEvent event,
          @jsonParam GithubUserModel? user,
          @jsonParam GithubUserModel? from,
          @jsonParam GithubUserModel? to,
          @jsonParam GithubProjectModel? project,
          @jsonParam GithubMilestoneValue? milestone,
          @jsonParam GithubReactionValue? reaction,
          @jsonParam GithubIssueModel? issue,
          @jsonParam GithubPullRequestModel? pullRequest,
          @jsonParam GithubLabelValue? label,
          ModelUri? url,
          ModelUri? commitUrl,
          ModelUri? htmlUrl,
          ModelUri? issueUrl,
          ModelUri? links,
          ModelUri? pullRequestUrl,
          ModelTimestamp createdAt,
          ModelTimestamp updatedAt,
          bool fromServer)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _GithubIssueTimelineModel():
      return $default(
          _that.id,
          _that.body,
          _that.previousBody,
          _that.authorAssociation,
          _that.commitId,
          _that.sha,
          _that.state,
          _that.reviewId,
          _that.event,
          _that.user,
          _that.from,
          _that.to,
          _that.project,
          _that.milestone,
          _that.reaction,
          _that.issue,
          _that.pullRequest,
          _that.label,
          _that.url,
          _that.commitUrl,
          _that.htmlUrl,
          _that.issueUrl,
          _that.links,
          _that.pullRequestUrl,
          _that.createdAt,
          _that.updatedAt,
          _that.fromServer);
    case _:
      throw StateError('Unexpected subclass');
  }
}