Make pub strong-mode clean.

lib/src/dart.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.
 
 /// A library for compiling Dart code and manipulating analyzer parse trees.
 import 'dart:async';
 import 'dart:io';
 import 'dart:isolate';
 
 import 'package:analyzer/analyzer.dart';
@@ skipping 16 matching lines @@
   /// The URI to the root directory where "dart:" libraries can be found.
   ///
   /// This is used as the base URL to generate library URLs that are then sent
   /// back to [provideInput].
   Uri get libraryRoot;
 
   /// Given [uri], responds with a future that completes to the contents of
   /// the input file at that URI.
   ///
   /// The future can complete to a string or a list of bytes.
-  Future/*<String | List<int>>*/ provideInput(Uri uri);
+  Future provideInput(Uri uri);
 
   /// Reports a diagnostic message from dart2js to the user.
   void handleDiagnostic(Uri uri, int begin, int end, String message,
                         compiler.Diagnostic kind);
 
   /// Given a [name] (which will be "" for the entrypoint) and a file extension,
   /// returns an [EventSink] that dart2js can write to to emit an output file.
   EventSink<String> provideOutput(String name, String extension);
 }
 
@@ skipping 137 matching lines @@
     });
 
     var response = await port.first;
     if (response['type'] == 'error') {
       throw new CrossIsolateException.deserialize(response['error']);
     }
 
     if (snapshot == null) return;
 
     ensureDir(p.dirname(snapshot));
-    var snapshotArgs = [];
+    var snapshotArgs = <String>[];
     if (packageRoot != null) snapshotArgs.add('--package-root=$packageRoot');
     snapshotArgs.addAll(['--snapshot=$snapshot', dartPath]);
     var result = await runProcess(Platform.executable, snapshotArgs);
 
     if (result.success) return;
 
     // Don't emit a fatal error here, since we don't want to crash the
     // otherwise successful isolate load.
     log.warning("Failed to compile a snapshot to "
         "${p.relative(snapshot)}:\n" + result.stderr.join("\n"));
@@ skipping 13 matching lines @@
   Isolate.spawnUri(Uri.parse(message['uri']), [], message['message'],
           packageRoot: packageRoot)
       .then((_) => replyTo.send({'type': 'success'}))
       .catchError((e, stack) {
     replyTo.send({
       'type': 'error',
       'error': CrossIsolateException.serialize(e, stack)
     });
   });
 }