PWA

(function() {
  var _currentDirectory = (function () {
  var _url;
  var lines = new Error().stack.split('\n');
  function lookupUrl() {
    if (lines.length > 2) {
      var match = lines[1].match(/^\s+at (.+):\d+:\d+$/);
      // Chrome.
      if (match) return match[1];
      // Chrome nested eval case.
      match = lines[1].match(/^\s+at eval [(](.+):\d+:\d+[)]$/);
      if (match) return match[1];
      // Edge.
      match = lines[1].match(/^\s+at.+\((.+):\d+:\d+\)$/);
      if (match) return match[1];
      // Firefox.
      match = lines[0].match(/[<][@](.+):\d+:\d+$/)
      if (match) return match[1];
    }
    // Safari.
    return lines[0].match(/(.+):\d+:\d+$/)[1];
  }
  _url = lookupUrl();
  var lastSlash = _url.lastIndexOf('/');
  if (lastSlash == -1) return _url;
  var currentDirectory = _url.substring(0, lastSlash + 1);
  return currentDirectory;
})();

  // Attempt to detect --precompiled mode for tests, and set the base url
// appropriately, otherwise set it to "/".
var baseUrl = (function() {
  var pathParts = location.pathname.split("/");
  if (pathParts[0] == "") {
    pathParts.shift();
  }
  var baseUrl;
  if (pathParts.length > 1 && pathParts[1] == "test") {
    return "/" + pathParts.slice(0, 2).join("/") + "/";
  }
  return "/";
}());

  var el;
  el = document.createElement("script");
  el.defer = true;
  el.async = false;
  el.src =
    baseUrl + "packages/$sdk/dev_compiler/web/dart_stack_trace_mapper.js";
  document.head.appendChild(el);
  el = document.createElement("script");
  el.defer = true;
  el.async = false;
  el.src = baseUrl + "packages/$sdk/dev_compiler/amd/require.js";
  el.setAttribute("data-main", _currentDirectory + "pwa.dart.bootstrap");
  document.head.appendChild(el);
})();