fix: update run/helloworld to use esmodules (GoogleCloudPlatform#3615)

* fix: update run/helloworld to esmodules

* fix: lint

* fix: gts fix

.eslintrc.json

@@ -10,5 +10,8 @@
     "node/no-unpublished-import": ["off"],
     "node/no-unpublished-require": ["off"],
     "node/no-unsupported-features/es-syntax": ["off"]
+  },
+  "parserOptions": {
+    "sourceType": "module"
   }
 }

run/helloworld/index.js

@@ -14,7 +14,7 @@
 
 // [START cloudrun_helloworld_service]
 // [START run_helloworld_service]
-const express = require('express');
+import express from 'express';
 const app = express();
 
 app.get('/', (req, res) => {
@@ -30,4 +30,4 @@ app.listen(port, () => {
 // [END cloudrun_helloworld_service]
 
 // Exports for testing purposes.
-module.exports = app;
+export default app;

run/helloworld/package.json

@@ -9,6 +9,7 @@
     "test": "c8 mocha -p -j 2 test/index.test.js --exit",
     "system-test": "NAME=Cloud c8 mocha -p -j 2 test/system.test.js --timeout=180000"
   },
+  "type": "module",
   "engines": {
     "node": ">=16.0.0"
   },

run/helloworld/test/index.test.js

@@ -12,14 +12,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-const assert = require('assert');
-const path = require('path');
-const supertest = require('supertest');
+import assert from 'assert';
+import supertest from 'supertest';
+import app from '../index.js';
 
 let request;
 describe('Unit Tests', () => {
   before(() => {
-    const app = require(path.join(__dirname, '..', 'index'));
     request = supertest(app);
   });
 

run/helloworld/test/system.test.js

@@ -12,10 +12,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-const assert = require('assert');
-const {execSync} = require('child_process');
-const request = require('got');
-const {GoogleAuth} = require('google-auth-library');
+import assert from 'assert';
+import {execSync} from 'child_process';
+import request from 'got';
+import {GoogleAuth} from 'google-auth-library';
 const auth = new GoogleAuth();
 
 const get = (route, base_url) => {