chore: modernize the samples and sample tests (#297)

packages/google-cloud-vision/samples/package.json

@@ -1,30 +1,31 @@
 {
   "name": "nodejs-docs-samples-vision",
-  "version": "0.0.1",
   "private": true,
   "license": "Apache-2.0",
   "author": "Google Inc.",
   "engines": {
     "node": ">=8"
   },
+  "files": [
+    "*.js"
+  ],
   "scripts": {
-    "test": "mocha system-test/*.test.js --timeout 600000"
+    "test": "mocha system-test --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/automl": "^0.1.1",
+    "@google-cloud/automl": "^0.1.3",
     "@google-cloud/vision": "^0.23.0",
-    "async": "^2.6.1",
     "mathjs": "^5.0.4",
     "natural": "^0.6.1",
     "redis": "^2.8.0",
     "yargs": "^12.0.0",
     "canvas": "^2.0.0"
   },
   "devDependencies": {
-    "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "@google-cloud/storage": "^2.0.0",
+    "chai": "^4.2.0",
+    "execa": "^1.0.0",
     "mocha": "^5.0.0",
     "uuid": "^3.2.1"
-  },
-  "optionalDependencies": {}
+  }
 }

packages/google-cloud-vision/samples/quickstart.js

@@ -16,20 +16,19 @@
 'use strict';
 
 // [START vision_quickstart]
-// Imports the Google Cloud client library
-const vision = require('@google-cloud/vision');
+async function quickstart() {
+  // Imports the Google Cloud client library
+  const vision = require('@google-cloud/vision');
 
-// Creates a client
-const client = new vision.ImageAnnotatorClient();
+  // Creates a client
+  const client = new vision.ImageAnnotatorClient();
 
-// Performs label detection on the image file
-async function main() {
+  // Performs label detection on the image file
   const [result] = await client.labelDetection('./resources/wakeupcat.jpg');
   const labels = result.labelAnnotations;
   console.log('Labels:');
   labels.forEach(label => console.log(label.description));
 }
-main().catch(err => {
-  console.error('ERROR:', err);
-});
 // [END vision_quickstart]
+
+quickstart().catch(console.error);