Implement ssrInit

apps/web/app/_trpc/ssrInit.ts

@@ -0,0 +1,44 @@
+import type { SSRConfig } from "next-i18next";
+import { serverSideTranslations } from "next-i18next/serverSideTranslations";
+import { headers } from "next/headers";
+import superjson from "superjson";
+
+import { CALCOM_VERSION } from "@calcom/lib/constants";
+import prisma from "@calcom/prisma";
+import { appRouter } from "@calcom/trpc/server/routers/_app";
+
+import { createTRPCNextLayout } from "./createTRPCNextLayout";
+
+export async function ssrInit(options?: { noI18nPreload: boolean }) {
+  const locale = headers().get("x-locale") ?? "en";
+
+  const i18n = (await serverSideTranslations(locale, ["common", "vital"])) || "en";
+
+  const ssr = createTRPCNextLayout({
+    router: appRouter,
+    transformer: superjson,
+    createContext() {
+      return { prisma, session: null, locale, i18n: i18n as unknown as SSRConfig };
+    },
+  });
+
+  // i18n translations are already retrieved from serverSideTranslations call, there is no need to run a i18n.fetch
+  // we can set query data directly to the queryClient
+  const queryKey = [
+    ["viewer", "public", "i18n"],
+    { input: { locale, CalComVersion: CALCOM_VERSION }, type: "query" },
+  ];
+  if (!options?.noI18nPreload) {
+    ssr.queryClient.setQueryData(queryKey, { i18n });
+  }
+
+  await Promise.allSettled([
+    // So feature flags are available on first render
+    ssr.viewer.features.map.prefetch(),
+    // Provides a better UX to the users who have already upgraded.
+    ssr.viewer.teams.hasTeamPlan.prefetch(),
+    ssr.viewer.public.session.prefetch(),
+  ]);
+
+  return ssr;
+}