Update

mongodb.ts

@@ -0,0 +1,38 @@
+var MongoClient = require("mongodb").MongoClient
+
+
+const uri = process.env.MONGOURL
+const options = {
+  useUnifiedTopology: true,
+  useNewUrlParser: true,
+}
+
+let client = null;
+let clientPromise
+
+if (!process.env.MONGOURL) {
+  throw new Error("Please add your Mongo URI to .env.local")
+}
+
+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