Fix code to determine root directory when using Safari.

lib/src/dartdevc/dartdevc.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:convert' show JsonEncoder;
 import 'dart:io';
 
 import 'package:analyzer/analyzer.dart';
 import 'package:barback/barback.dart';
@@ skipping 19 matching lines @@
       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.+\((.+):\d+:\d+\)$/);
       if (match) return match[1];
       // Firefox.
-      return lines[0].match(/[<][@](.+):\d+:\d+$/)[1];
+      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;
 })();
@@ skipping 243 matching lines @@
         transitiveModuleDeps.map((depId) => depId.linkedSummaryId).toSet();
     var allAssetIds = new Set<AssetId>()
       ..addAll(module.assetIds)
       ..addAll(linkedSummaryIds);
     await scratchSpace.ensureAssets(allAssetIds);
     var jsOutputFile = scratchSpace.fileFor(module.id.jsId);
     var sdk_summary = p.url.join(sdkDir.path, 'lib/_internal/ddc_sdk.sum');
     var request = new WorkRequest();
     request.arguments.addAll([
       '--dart-sdk-summary=$sdk_summary',
-      // TODO(jakemac53): Remove when no longer needed,

[jakemac, 2017/06/12 19:54:22]

Did you confirm we don't need this any more? Does it require the new compiler?

[kevmoo, 2017/06/12 20:05:27]

I think this was dropped. Ping Jenny

-      // https://github.com/dart-lang/pub/issues/1583.
-      '--unsafe-angular2-whitelist',
       '--modules=amd',
       '--dart-sdk=${sdkDir.path}',
       '--module-root=${scratchSpace.tempDir.path}',
       '--library-root=${p.dirname(jsOutputFile.path)}',
       '--summary-extension=${linkedSummaryExtension.substring(1)}',
       '--no-summarize',
       '-o',
       jsOutputFile.path,
     ]);
 
@@ skipping 105 matching lines @@
     } finally {
       for (var id in completers.keys) {
         if (!completers[id].isCompleted) {
           completers[id].completeError(new AssetNotFoundException(id));
         }
       }
     }
   }();
   return futures;
 }