Function mutationHandler

packages/shared/src/hooks/useBookmarkPost.ts:293–310

(post: Post)

  }

  const mutationHandler = (post: Post) => {
    const isBookmarked = !post?.bookmarked;
    const nextBookmarks = getOptimisticBookmarkCount(
      post?.analytics?.bookmarks,
      post?.bookmarked,
    );

    return {
      bookmarked: isBookmarked,
      bookmark: !isBookmarked ? undefined : post?.bookmark,
      analytics: post?.analytics
        ? {
            ...post.analytics,
            bookmarks: nextBookmarks,
          }
        : post?.analytics,
    };
  };

  const rollbackFunctions: (() => void)[] = [];