Removed fixed dependencies

packages/dart_style/tool/node_format_service.dart

+// Copyright (c) 2016, 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:math' as math;
+
+import 'package:js/js.dart';
+
+import 'package:dart_style/dart_style.dart';
+
+@JS()
+@anonymous
+class FormatResult {
+  external factory FormatResult({String code, String error});
+  external String get code;
+  external String get error;
+}
+
+@JS('exports.formatCode')
+external set formatCode(Function formatter);
+
+void main() {
+  formatCode = allowInterop((String source) {
+    var formatter = new DartFormatter();
+
+    var exception;
+    try {
+      return new FormatResult(code: new DartFormatter().format(source));
+    } on FormatterException catch (err) {
+      // Couldn't parse it as a compilation unit.
+      exception = err;
+    }
+
+    // Maybe it's a statement.
+    try {
+      return new FormatResult(code: formatter.formatStatement(source));
+    } on FormatterException catch (err) {
+      // There is an error when parsing it both as a compilation unit and a
+      // statement, so we aren't sure which one the user intended. As a
+      // heuristic, we'll choose that whichever one we managed to parse more of
+      // before hitting an error is probably the right one.
+      if (_firstOffset(exception) < _firstOffset(err)) {
+        exception = err;
+      }
+    }
+
+    // If we get here, it couldn't be parsed at all.
+    return new FormatResult(code: source, error: "$exception");
+  });
+}
+
+/// Returns the offset of the error nearest the beginning of the file out of
+/// all the errors in [exception].
+int _firstOffset(FormatterException exception) =>
+    exception.errors.map((error) => error.offset).reduce(math.min);