How to close electron app via javascript? : <p>I am running an express app via electron.</p>

<p>Below is the main.js</p>

<pre><code>   const electron = require("electron"),
          app = electron.app,
          BrowserWindow = electron.BrowserWindow;

    let mainWindow;

    function createWindow () {
      mainWindow = new BrowserWindow({
          width: 1200,
        height: 800,
        frame: false,
        kiosk: true
      });
      mainWindow.loadURL(`file://${__dirname}/index.html`)
     mainWindow.webContents.openDevTools();

      mainWindow.on("closed", function () {
        mainWindow = null;
      })
    }

    app.on("ready", createWindow);
    app.on("browser-window-created",function(e,window) {
      window.setMenu(null);
    });

    app.on("window-all-closed", function () {
      if (process.platform !== "darwin") {
        app.quit();
      }
    });



    app.on("activate", function () {
      if (mainWindow === null) {
        createWindow();
      }
    });
</code></pre>

<p>and below is a button in the view that upon click i would like it to close the app </p>

<pre><code>&lt;button id="close-btn"&gt;&lt;i class="fa fa-cube" aria-hidden="true"&gt;&lt;/i&gt;&amp;nbsp; Close application&lt;/button&gt;
</code></pre>

<p>Essentially I want to activate this part of the code once the button has been clicked</p>

<pre><code>  app.on("window-all-closed", function () {
          if (process.platform !== "darwin") {
            app.quit();
          }
        });
</code></pre>
