lib/preamble.js

// 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.
global.location = {
  href: "file://" + (function() {
    var cwd = process.cwd();
    if (process.platform != 'win32') return cwd;
    return '/' + cwd.replace('\\', '/');
  })() + "/"
};

global.scheduleImmediate = setImmediate;
global.self = global;
global.require = require;
global.export = export;
global.process = process;

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

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