Function defaultOnMutate

packages/shared/src/hooks/useBookmarkPost.ts:102–137

({
    id,
  })

  const { logOpts } = useActiveFeedContext();

  const defaultOnMutate: NonNullable<UseBookmarkPostProps['onMutate']> = ({
    id,
  }) => {
    if (!id) {
      return undefined;
    }

    const previousPost = client.getQueryData<PostData>(
      getPostByIdKey(id),
    )?.post;

    updatePostCache(client, id, (post) => ({
      bookmarked: !post.bookmarked,
      analytics: post.analytics
        ? {
            ...post.analytics,
            bookmarks: getOptimisticBookmarkCount(
              post.analytics.bookmarks,
              post.bookmarked,
            ),
          }
        : post.analytics,
    }));

    return () => {
      if (!previousPost) {
        return;
      }

      updatePostCache(client, id, () => ({
        bookmarked: previousPost.bookmarked,
        bookmark: previousPost.bookmark,
        analytics: previousPost.analytics,
      }));
    };
  };

  const { mutateAsync: bookmarkPost } = useMutation({
    mutationKey: mutationKey