- let { pageID, lang } = theme.messenger
- lang = theme.comments.use && theme.comments.use.includes('Facebook Comments') ? theme.facebook_comments.lang : lang

#fb-customer-chat.fb-customerchat(page_id=pageID attribution='biz_inbox')

script.
  (() => {
    document.getElementById('fb-root') ? '' : document.body.insertAdjacentHTML('afterend', '<div id="fb-root"></div>')

    window.fbAsyncInit = function() {
      FB.init({
        xfbml: true,
        version: 'v16.0'
      });
    };

    (function(d, s, id) {
      var js, fjs = d.getElementsByTagName(s)[0];
      if (d.getElementById(id)) return;
      js = d.createElement(s); js.id = id;
      js.src = 'https://connect.facebook.net/!{lang}/sdk/xfbml.customerchat.js';
      fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));

    const isChatBtn = !{theme.chat_btn}
    const isChatHideShow = !{theme.chat_hide_show}

    if (isChatBtn) {
      window.chatBtnFn = () => {
        const isShow = document.querySelector('.fb_customer_chat_bounce_in_v2')
        isShow ? FB.CustomerChat.hide() : FB.CustomerChat.show()
      }
    } else if (isChatHideShow) {
      window.chatBtn = {
        hide: () => {
          FB.CustomerChat.hide()
        },
        show: () => {
          FB.CustomerChat.show(false)
        }
      }
    }
  })()