Trace.current skips an extra frame in JS.

lib/src/utils.dart

 // Copyright (c) 2013, 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 'package:path/path.dart' as p;
+
 /// The line used in the string representation of stack chains to represent
 /// the gap between traces.
 const chainGap = '===== asynchronous gap ===========================\n';
 
+// TODO(nweiz): When cross-platform imports work, use them to set this.
+/// Whether we're running in a JS context.
+final bool inJS = p.style == p.Style.url;

[kevmoo, 2016/06/14 22:35:13]

Could this cause problems for VM files loaded via HTTP? (i.e. pub, pub run, etc)

[nweiz, 2016/06/14 22:54:56]

The URL that Dart code is loaded from doesn't affect Uri.base.

+
 /// Returns [string] with enough spaces added to the end to make it [length]
 /// characters long.
 String padRight(String string, int length) {
   if (string.length >= length) return string;
 
   var result = new StringBuffer();
   result.write(string);
   for (var i = 0; i < length - string.length; i++) {
     result.write(' ');
   }
 
   return result.toString();
 }