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1 files changed, 30 insertions, 0 deletions

diff --git a/lib/mongodb.js b/lib/mongodb.js
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+// This approach is taken from https://github.com/vercel/next.js/tree/canary/examples/with-mongodb
+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;
+
+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).
+  if (!global._mongoClientPromise) {
+    client = new MongoClient(uri, options);
+    global._mongoClientPromise = client.connect();
+  }
+  clientPromise = global._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;