Below example (in line 43 ~ 45) not working like comment. Because `ipcRenderer` callback function have two parameters (event, arg).
```javascript
ipcRenderer.on('asynchronous-reply', (arg) => {
console.log(arg) // "pong" 출력
})
```
const {ipcRenderer} = require('electron')
console.log(ipc.sendSync('synchronous-message', 'ping')) // "pong" 출력
-ipcRenderer.on('asynchronous-reply', (arg) => {
+ipcRenderer.on('asynchronous-reply', (event, arg) => {
console.log(arg) // "pong" 출력
})
ipcRenderer.send('asynchronous-message', 'ping')