Specify a port option

.gitignore

@@ -1 +1,2 @@
 node_modules
+.env

index.js

@@ -136,6 +136,6 @@ const server = new ApolloServer({
   }
 });
 
-server.listen().then(({url}) => {
+server.listen({port: process.env.PORT}).then(({url}) => {
   console.log(`🚀  Server ready at ${url}`);
 });

package-lock.json

@@ -2805,6 +2805,12 @@
         "is-obj": "^1.0.0"
       }
     },
+    "dotenv": {
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-8.2.0.tgz",
+      "integrity": "sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw==",
+      "dev": true
+    },
     "duplexer3": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/duplexer3/-/duplexer3-0.1.4.tgz",

package.json

@@ -1,6 +1,6 @@
 {
   "scripts": {
-    "start": "nodemon index.js",
+    "start": "nodemon -r dotenv/config index.js",
     "pretest": "eslint functions",
     "test": "echo \"Error: no test specified\" && exit"
   },
@@ -16,6 +16,7 @@
   "devDependencies": {
     "@trevorblades/eslint-config": "^7.0.1",
     "apollo": "^2.16.0",
+    "dotenv": "^8.2.0",
     "eslint": "^6.2.1",
     "nodemon": "^2.0.2"
   }