docs(samples): modernize the samples (#838)

Author: JustinBeckwith

packages/google-cloud-vision/samples/.eslintrc.yml

@@ -1,3 +1,4 @@
 ---
 rules:
   no-console: off
+  node/no-unsupported-features/node-builtins: off

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

@@ -2,9 +2,9 @@
   "name": "nodejs-docs-samples-vision",
   "private": true,
   "license": "Apache-2.0",
-  "author": "Google Inc.",
+  "author": "Google LLC",
   "engines": {
-    "node": ">=8"
+    "node": ">=10.17.0"
   },
   "files": [
     "*.js"
@@ -14,7 +14,6 @@
   },
   "dependencies": {
     "@google-cloud/vision": "^2.1.2",
-    "mathjs": "^7.0.0",
     "natural": "^2.0.0",
     "pureimage": "^0.2.1",
     "redis": "^3.0.0",

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

@@ -14,20 +14,33 @@
 
 'use strict';
 
-// [START vision_quickstart]
-async function quickstart() {
-  // Imports the Google Cloud client library
-  const vision = require('@google-cloud/vision');
+// sample-metadata:
+//   title: Cloud Vision Quickstart
+//   description: Performs label detection of an image with a cat.
+//   usage: node quickstart.js
 
-  // Creates a client
-  const client = new vision.ImageAnnotatorClient();
+function main() {
+  // [START vision_quickstart]
+  async function quickstart() {
+    // Imports the Google Cloud client library
+    const vision = require('@google-cloud/vision');
 
-  // 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));
+    // Creates a client
+    const client = new vision.ImageAnnotatorClient();
+
+    // 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));
+  }
+  quickstart();
+  // [END vision_quickstart]
 }
-// [END vision_quickstart]
 
-quickstart().catch(console.error);
+process.on('unhandledRejection', err => {
+  console.error(err.message);
+  process.exitCode = 1;
+});
+
+main(...process.argv.slice(2));