message: Don't run loader if it was already loaded
diff: @@ -23,6 +23,10 @@ type onFailedCallback = (error: Error) => void;
  type NormalizedUrl = string&{_normalized: never};
  (function() {
  +if (window.define) {
  + /* The loader was already loaded, make sure we don't reset it's state. */
  + return;
  +}
  // Set to true for more logging. Anything guarded by an
  // `if (debugging)` check will not appear in the final output.
  