AppTray.js

const { app, Menu, Tray } = require('electron');

class AppTray extends Tray {
    constructor(icon, mainWindow) {
        super(icon);

        this.setToolTip('SysTop');

        this.mainWindow = mainWindow;

        this.on('click', this.onClick.bind(this));
        this.on('right-click', this.onRightClick.bind(this));
    }

    onClick() {
        if (this.mainWindow.isVisible() === true) {
            this.mainWindow.hide();
        } else {
            this.mainWindow.show();
        }
    }

    onRightClick() {
        const contextMenu = Menu.buildFromTemplate([
            {
                label: 'Quit',
                click: () => {
                    app.isQuitting = true
                    app.quit()
                }
            }
        ]);

        this.popUpContextMenu(contextMenu);
    }
}

module.exports = AppTray;