1 files changed, 37 insertions, 0 deletions
diff --git a/src/services/graphql/fetchers/posts/fetch-last-post-cursor.ts b/src/services/graphql/fetchers/posts/fetch-last-post-cursor.ts
new file mode 100644
index 0000000..d5ed174
--- /dev/null
+++ b/src/services/graphql/fetchers/posts/fetch-last-post-cursor.ts
@@ -0,0 +1,37 @@
+import type { GraphQLPageInfo, Nullable } from '../../../../types';
+import { fetchGraphQL, getGraphQLUrl } from '../../../../utils/helpers';
+
+type LastPostCursorResponse = {
+  posts: Nullable<{
+    pageInfo: Pick<GraphQLPageInfo, 'endCursor'>;
+  }>;
+};
+
+const lastPostCursorQuery = `query LastPostCursor($first: Int) {
+  posts(first: $first) {
+    pageInfo {
+      endCursor
+    }
+  }
+}`;
+
+/**
+ * Retrieve the cursor of the last post for a given number of posts.
+ *
+ * @param {number} count - The number of posts to fetch.
+ * @returns {Promise<string>} The cursor of the last post.
+ */
+export const fetchLastPostCursor = async (count: number): Promise<string> => {
+  const response = await fetchGraphQL<LastPostCursorResponse>({
+    url: getGraphQLUrl(),
+    query: lastPostCursorQuery,
+    variables: { first: count },
+  });
+
+  if (!response.posts?.pageInfo.endCursor)
+    return Promise.reject(
+      new Error('Unable to find the cursor of the last post.')
+    );
+
+  return response.posts.pageInfo.endCursor;
+};