esx_core/html/js/wrapper.js

(() => {

  let ESXWrapper         = {};
  ESXWrapper.MessageSize = 1024;
  ESXWrapper.messageId   = 0;

  window.SendMessage = function(namespace, type, msg) {

    ESXWrapper.messageId = (ESXWrapper.messageId < 65535) ? ESXWrapper.messageId + 1 : 0;
    const str   = JSON.stringify(msg);

    for(let i=0; i<str.length; i++) {

      let count = 0;
      let chunk = '';

      while(count < ESXWrapper.MessageSize && i<str.length) {

        chunk += str[i];

        count++;
        i++;
      }

      i--;

      const data = {
        __type : type,
        id     : ESXWrapper.messageId,
        chunk  : chunk
      }

      if(i == str.length - 1)
        data.end = true;

      $.post('http://' + namespace + '/__chunk', JSON.stringify(data));

    }

  }

})()