♻️ Create backend package (#643)

packages/backend/next/utils.ts

@@ -0,0 +1,23 @@
+import { GetServerSideProps } from "next";
+
+export function composeGetServerSideProps(
+  ...fns: GetServerSideProps[]
+): GetServerSideProps {
+  return async (ctx) => {
+    const res = { props: {} };
+    for (const getServerSideProps of fns) {
+      const fnRes = await getServerSideProps(ctx);
+
+      if ("props" in fnRes) {
+        res.props = {
+          ...res.props,
+          ...fnRes.props,
+        };
+      } else {
+        return fnRes;
+      }
+    }
+
+    return res;
+  };
+}