Function loadScript

docs/bitty.js:398–414

(src, type, callback)

}

function loadScript(src, type, callback) {
  let script = document.getElementById(src);

  if (script) {
    return Promise.resolve(script);
  }
  let promise = new Promise((resolve, reject) => {
    console.log("📜 Loading Script:", src)

    script = document.createElement("script")
    if (type && type.length) script.type = type;
    script.onload = () => resolve(script);
    script.src = script.id = src;
    document.head.appendChild(script);
  })
  return callback ? promise.then(callback) : promise;
}

// iMessage incorrectly handles urls with more than 301 sequential non-breakable characters, so we introduce = to prevent this
function escapeStringForIMessage(str) {