feat(example-greeter-extension): add npm start script to run the example app

Author: raymondfeng

examples/greeter-extension/README.md

@@ -354,6 +354,16 @@ app.bind('greeters.ChineseGreeter.options').to({nameFirst: false});
 - [Guidelines](https://github.com/strongloop/loopback-next/blob/master/docs/CONTRIBUTING.md)
 - [Join the team](https://github.com/strongloop/loopback-next/issues/110)
 
+## Try out
+
+Run `npm start` from the root folder to run the sample application. You should
+see the following message:
+
+```
+English: Hello, Raymond
+Chinese: Raymond，你好
+```
+
 ## Tests
 
 Run `npm test` from the root folder.

examples/greeter-extension/index.js

@@ -4,3 +4,8 @@
 // License text available at https://opensource.org/licenses/MIT
 
 module.exports = require('./dist');
+
+if (require.main === module) {
+  const app = new module.exports.GreetingApplication();
+  app.main();
+}

examples/greeter-extension/package.json

@@ -22,6 +22,8 @@
     "test": "lb-mocha \"dist/__tests__/**/*.js\"",
     "posttest": "npm run lint",
     "test:dev": "lb-mocha --allow-console-logs dist/__tests__/**/*.js && npm run posttest",
+    "prestart": "npm run build",
+    "start": "node .",
     "verify": "npm pack && tar xf *example-greeter-extension*.tgz && tree package && npm run clean"
   },
   "repository": {

examples/greeter-extension/src/__tests__/greeter-extension.acceptance.ts

@@ -3,19 +3,14 @@
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 
-import {Application, bind, createBindingFromClass} from '@loopback/core';
+import {bind, createBindingFromClass} from '@loopback/core';
 import {expect} from '@loopback/testlab';
 import chalk from 'chalk';
-import {
-  asGreeter,
-  Greeter,
-  GreeterComponent,
-  GreetingService,
-  GREETING_SERVICE,
-} from '..';
+import {asGreeter, Greeter, GreetingService, GREETING_SERVICE} from '..';
+import {GreetingApplication} from '../application';
 
 describe('greeter-extension-pont', () => {
-  let app: Application;
+  let app: GreetingApplication;
   let greetingService: GreetingService;
 
   beforeEach(givenAppWithGreeterComponent);
@@ -71,11 +66,10 @@ describe('greeter-extension-pont', () => {
   });
 
   function givenAppWithGreeterComponent() {
-    app = new Application();
-    app.component(GreeterComponent);
+    app = new GreetingApplication();
   }
 
   async function findGreetingService() {
-    greetingService = await app.get(GREETING_SERVICE);
+    greetingService = await app.getGreetingService();
   }
 });

examples/greeter-extension/src/application.ts

@@ -0,0 +1,28 @@
+// Copyright IBM Corp. 2019. All Rights Reserved.
+// Node module: @loopback/example-greeter-extension
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+/* istanbul ignore file */
+import {Application} from '@loopback/core';
+import {GreeterComponent} from './component';
+import {GREETING_SERVICE} from './keys';
+
+export class GreetingApplication extends Application {
+  constructor() {
+    super();
+    this.component(GreeterComponent);
+  }
+
+  async main() {
+    const greetingService = await this.getGreetingService();
+    let msg = await greetingService.greet('en', 'Raymond');
+    console.log('English:', msg);
+    msg = await greetingService.greet('zh', 'Raymond');
+    console.log('Chinese:', msg);
+  }
+
+  async getGreetingService() {
+    return await this.get(GREETING_SERVICE);
+  }
+}

examples/greeter-extension/src/index.ts

@@ -3,6 +3,7 @@
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 
+export * from './application';
 export * from './component';
 export * from './greeting-service';
 export * from './keys';