The first commit, the core and all files is adding to repo

lib/supabase.ts

@@ -0,0 +1,54 @@
+import "server-only";
+import { createClient } from "@supabase/supabase-js";
+import { createServerClient } from "@supabase/ssr";
+import { cookies } from "next/headers";
+import type { Database } from "@/shared/database";
+let singleton: ReturnType<typeof createClient<Database>> | undefined;
+export function admin() {
+  if (!process.env.NEXT_PUBLIC_SUPABASE_URL || !process.env.SUPABASE_SECRET_KEY)
+    throw new Error(
+      "Supabase configuration missing. Run npm run setup and configure .env.local.",
+    );
+  return (singleton ??= createClient<Database>(
+    process.env.NEXT_PUBLIC_SUPABASE_URL,
+    process.env.SUPABASE_SECRET_KEY,
+    { auth: { persistSession: false, autoRefreshToken: false } },
+  ));
+}
+export async function authClient() {
+  const jar = await cookies();
+  return createServerClient(
+    process.env.NEXT_PUBLIC_SUPABASE_URL!,
+    process.env.NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY!,
+    {
+      cookies: {
+        getAll: () => jar.getAll(),
+        setAll: (values) => {
+          try {
+            values.forEach(({ name, value, options }) =>
+              jar.set(name, value, options),
+            );
+          } catch {
+            /* Server components refresh through proxy. */
+          }
+        },
+      },
+    },
+  );
+}
+export async function user() {
+  const client = await authClient();
+  const {
+    data: { user },
+  } = await client.auth.getUser();
+  return user;
+}
+export function required<T>(result: {
+  data: T;
+  error: { message: string } | null;
+}): NonNullable<T> {
+  if (result.error) throw new Error(result.error.message);
+  if (result.data === null || result.data === undefined)
+    throw new Error("Record not found");
+  return result.data as NonNullable<T>;
+}