feat: add notification about new version available (#2100)

.github/workflows/e2e-tests.yml

@@ -6,7 +6,7 @@ jobs:
   build-and-e2e:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - run: npm ci
-    - run: npm run bundle
-    - run: npm run e2e
+      - uses: actions/checkout@v3
+      - run: npm ci && npm ci --prefix cli
+      - run: npm run bundle
+      - run: npm run e2e

cli/index.ts

@@ -1,6 +1,7 @@
 #!/usr/bin/env node
 /* tslint:disable:no-implicit-dependencies */
 import * as React from 'react';
+import * as updateNotifier from 'update-notifier';
 import { renderToString } from 'react-dom/server';
 import { ServerStyleSheet } from 'styled-components';
 
@@ -111,6 +112,7 @@ const handlerForBuildCommand = async (argv: any) => {
   };
 
   try {
+    notifyUpdateCliVersion();
     await bundle(argv.spec, config);
   } catch (e) {
     handleError(e);
@@ -174,6 +176,7 @@ YargsParser.command(
     };
 
     try {
+      notifyUpdateCliVersion();
       await serve(argv.host as string, argv.port as number, argv.spec as string, config);
     } catch (e) {
       handleError(e);
@@ -468,3 +471,16 @@ function getObjectOrJSON(options) {
       return {};
   }
 }
+
+function notifyUpdateCliVersion() {
+  const pkg = require('./package.json');
+  const notifier = updateNotifier({
+    pkg,
+    updateCheckInterval: 0,
+    shouldNotifyInNpmScript: true,
+  });
+  notifier.notify({
+    message:
+      'Run `{updateCommand}` to update.\nChangelog: https://github.com/Redocly/redoc/releases/tag/{latestVersion}',
+  });
+}