Dynamic script loader

dynamic_scripts.js

(() => {
  const libs = [
    "https://cdnjs.cloudflare.com/ajax/libs/superagent/1.2.0/superagent.min.js",
    "https://cdnjs.cloudflare.com/ajax/libs/ramda/0.18.0/ramda.min.js"
  ].map((src) => {
    return new Promise(resolve => {
      const script = document.createElement("script");
      script.src = src;
      script.async = false;
      script.onload = () => {
        resolve();
      };
      document.head.appendChild(script);
    });    
  });
  return Promise.all(libs).then(() => { 
    console.log(superagent, R);
  });
})();