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calcom/apps/web/server/lib/ssg.ts

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+import type { GetStaticPropsContext } from "next";
+import { serverSideTranslations } from "next-i18next/serverSideTranslations";
+import superjson from "superjson";
+
+import { CALCOM_VERSION } from "@calcom/lib/constants";
+import prisma, { readonlyPrisma } from "@calcom/prisma";
+import { createServerSideHelpers } from "@calcom/trpc/react/server";
+import { appRouter } from "@calcom/trpc/server/routers/_app";
+
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const { i18n } = require("@calcom/config/next-i18next.config");
+
+/**
+ * Initialize static site rendering tRPC helpers.
+ * Provides a method to prefetch tRPC-queries in a `getStaticProps`-function.
+ * Automatically prefetches i18n based on the passed in `context`-object to prevent i18n-flickering.
+ * Make sure to `return { props: { trpcState: ssr.dehydrate() } }` at the end.
+ */
+export async function ssgInit<TParams extends { locale?: string }>(opts: GetStaticPropsContext<TParams>) {
+  const requestedLocale = opts.params?.locale || opts.locale || i18n.defaultLocale;
+  const isSupportedLocale = i18n.locales.includes(requestedLocale);
+  if (!isSupportedLocale) {
+    console.warn(`Requested unsupported locale "${requestedLocale}"`);
+  }
+  const locale = isSupportedLocale ? requestedLocale : i18n.defaultLocale;
+
+  const _i18n = await serverSideTranslations(locale, ["common"]);
+
+  const ssg = createServerSideHelpers({
+    router: appRouter,
+    transformer: superjson,
+    ctx: {
+      prisma,
+      insightsDb: readonlyPrisma,
+      session: null,
+      locale,
+      i18n: _i18n,
+    },
+  });
+
+  // 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" },
+  ];
+
+  ssg.queryClient.setQueryData(queryKey, { i18n: _i18n });
+
+  return ssg;
+}