fix: rename main app method to main, remove redundant wrapper

src/app.ts

@@ -3,7 +3,8 @@ import { VERSION_INFO } from './version';
 import JSON_DATA from './resource/json.json';
 import YAML_DATA from './resource/yaml.yml';
 
-export async function createApp(): Promise<void> {
+export async function main(argv: Array<string>): Promise<number> {
   // tslint:disable-next-line:no-console
-  console.log('Hello World!', VERSION_INFO, JSON_DATA, YAML_DATA);
+  console.log('Hello World!', VERSION_INFO, JSON_DATA, YAML_DATA, argv);
+  return 1;
 }

src/index.ts

@@ -1,18 +1,10 @@
-import { createApp } from './app';
+import { main } from './app';
+
+const STATUS_ERROR = 1;
 
 /**
  * This is the main entry-point to the program and the only file not included in the main bundle.
- *
- * Keep the main method minimal, since this file cannot be tested.
  */
-const STATUS_SUCCESS = 0;
-const STATUS_ERROR = 1;
-
-async function main(argv: Array<string>): Promise<number> {
-  await createApp();
-  return STATUS_SUCCESS;
-}
-
 main(process.argv).then((status) => process.exit(status)).catch((err: Error) => {
   /* tslint:disable-next-line:no-console */
   console.error('uncaught error during main:', err);

test/TestApp.ts

@@ -1,7 +1,7 @@
 import { expect } from 'chai';
 import { spy } from 'sinon';
 
-import { createApp } from '../src/app';
+import { main } from '../src/app';
 import { describeLeaks, itLeaks } from './helpers/async';
 
 describeLeaks('app', async () => {
@@ -9,7 +9,7 @@ describeLeaks('app', async () => {
     /* tslint:disable-next-line:no-console no-unbound-method */
     const logSpy = spy(console, 'log');
 
-    await createApp();
+    await main([]);
 
     expect(logSpy).to.have.callCount(1);
   });