Name button about telebot HOT 6 CLOSED

bot.on('/start', msg => {
  // Keyboard markup
  let markup = bot.keyboard([
    ['Button1'],
  ], { resize: true });
  return bot.sendMessage(msg.from.id, 'Keyboard button.', { markup });
});

bot.on('text', (msg, props) => {
  // Button name text
  if (msg.text == 'Button1') {
    // Call /hello command
    return bot.event('/hello', msg, props);
  }
  return bot.sendMessage(msg.from.id, msg.text);
});

bot.on('/hello', msg => {
  return bot.sendMessage(msg.from.id, 'Hello, Command!');
});

// Navigation button names
const mainBtn = 'Open sub-buttons';
const backBtn = 'Back to main menu';

// Main menu buttons
const mainButtons = bot.keyboard([
    [mainBtn]
  ], { resize: true });

// Sub-menu buttons
const subButtons = bot.keyboard([
    ['Button1', 'Button2'],
    [backBtn]
  ], { resize: true });

// On start, send a main menu markup
bot.on('/start', msg => {
  let markup = mainButtons;
  return bot.sendMessage(msg.from.id, 'Hello!', { markup });
});

// On text, check if it's a button name
bot.on('text', msg => {
  if (msg.text == mainBtn) {
    // Main button clicked, send a sub-menu markup
    return bot.sendMessage(msg.from.id, 'Sub-menu', { markup: subButtons });
  } else if (msg.text == backBtn) {
    // Back button clicked, send a main menu markup
    return bot.sendMessage(msg.from.id, 'Main menu', { markup: mainButtons });
  }
});