init auth

lib/mongodb.ts

@@ -0,0 +1,34 @@
+// https://github.com/vercel/next.js/blob/canary/examples/with-mongodb/lib/mongodb.ts
+import { MongoClient } from "mongodb";
+
+if (!process.env.MONGODB_URI) {
+  throw new Error('Invalid/Missing environment variable: "MONGODB_URI"');
+}
+
+const uri = process.env.MONGODB_URI;
+const options = {};
+
+let client;
+let clientPromise: Promise<MongoClient>;
+
+if (process.env.NODE_ENV === "development") {
+  // In development mode, use a global variable so that the value
+  // is preserved across module reloads caused by HMR (Hot Module Replacement).
+  let globalWithMongo = global as typeof globalThis & {
+    _mongoClientPromise?: Promise<MongoClient>;
+  };
+
+  if (!globalWithMongo._mongoClientPromise) {
+    client = new MongoClient(uri, options);
+    globalWithMongo._mongoClientPromise = client.connect();
+  }
+  clientPromise = globalWithMongo._mongoClientPromise;
+} else {
+  // In production mode, it's best to not use a global variable.
+  client = new MongoClient(uri, options);
+  clientPromise = client.connect();
+}
+
+// Export a module-scoped MongoClient promise. By doing this in a
+// separate module, the client can be shared across functions.
+export default clientPromise;