message: Ensure that boot.html in polymer declares the Polymer namespace, like the original source does.
diff: @@ -58,6 +58,9 @@ export function configureAnalyzer(options: ConvertPackageOptions) {
  // and does other things that make less sense in an ESM world.
  const bootOverrideHtml = `<script>
  window.JSCompiler_renameProperty = function(prop, obj) { return prop; }
  +
  + /** @namespace */
  + let Polymer;
  </script>`;
  const urlLoader = new InMemoryOverlayUrlLoader(new FSUrlLoader(inDir));
  urlLoader.urlContentsMap.set('lib/utils/boot.html', bootOverrideHtml);
  