lib/preamble.js

var self = Object.create(global);

// TODO: This isn't really a correct transformation. For example, it will fail
// for paths that contain characters that need to be escaped in URLs. Once
// dart-lang/sdk#27979 is fixed, it should be possible to make it better.
self.location = {
  get href() {
    return "file://" + (function() {
      var cwd = process.cwd();
      if (process.platform != "win32") return cwd;
      return "/" + cwd.replace(/\\/g, "/");
    })() + "/";
  }
};

self.scheduleImmediate = setImmediate;
self.require = require;
self.exports = exports;
self.process = process;

self.__dirname = __dirname;
self.__filename = __filename;

(function() {
  function computeCurrentScript() {
    try {
      throw new Error();
    } catch(e) {
      var stack = e.stack;
      var re = new RegExp("^ *at [^(]*\\((.*):[0-9]*:[0-9]*\\)$", "mg");
      var lastMatch = null;
      do {
        var match = re.exec(stack);
        if (match != null) lastMatch = match;
      } while (match != null);
      return lastMatch[1];
    }
  }

  var cachedCurrentScript = null;
  self.document = {
    get currentScript() {
      if (cachedCurrentScript == null) {
        cachedCurrentScript = {src: computeCurrentScript()};
      }
      return cachedCurrentScript;
    }
  };
})();

self.dartDeferredLibraryLoader = function(uri, successCallback, errorCallback) {
  try {
    load(uri);
    successCallback();
  } catch (error) {
    errorCallback(error);
  }
};