switch package to strong mode

lib/messages/build_logger.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.
 
 library code_transformers.messages.messages_logger;
 
 import 'dart:async';
 import 'dart:convert' show JSON;
 
 import 'package:barback/barback.dart';
@@ skipping 41 matching lines @@
   /// If transform is a [Transform] then [primaryId] will default to the
   /// primaryInput.id, if it is an [AggregateTransform] then you must pass in
   /// a [primaryId] to be used, otherwise you will get a runtime error.
   BuildLogger(transform,
       {this.convertErrorsToWarnings: false, AssetId primaryId, this.detailsUri})
       : _transform = transform,
         _primaryId = primaryId != null ? primaryId : transform.primaryInput.id;
 
   /// Records a message at the fine level. If [msg] is a [Message] it is
   /// recorded directly, otherwise it is first converted to a [String].
-  void fine(msg, {AssetId asset, SourceSpan span}) {
+  void fine(Object msg, {AssetId asset, SourceSpan span}) {
     msg = msg is Message ? msg : new Message.unknown('$msg');
     _transform.logger.fine(_snippet(msg), asset: asset, span: span);
     _logs.add(new BuildLogEntry(msg, span, LogLevel.FINE.name));
   }
 
   /// Records a message at the info level. If [msg] is a [Message] it is
   /// recorded directly, otherwise it is first converted to a [String].
-  void info(msg, {AssetId asset, SourceSpan span}) {
+  void info(Object msg, {AssetId asset, SourceSpan span}) {
     msg = msg is Message ? msg : new Message.unknown('$msg');
     _transform.logger.info(_snippet(msg), asset: asset, span: span);
     _logs.add(new BuildLogEntry(msg, span, LogLevel.INFO.name));
   }
 
   /// Records a warning message. If [msg] is a [Message] it is recorded
   /// directly, otherwise it is first converted to a [String].
-  void warning(msg, {AssetId asset, SourceSpan span}) {
+  void warning(Object msg, {AssetId asset, SourceSpan span}) {
     msg = msg is Message ? msg : new Message.unknown('$msg');
     _transform.logger.warning(_snippet(msg), asset: asset, span: span);
     _logs.add(new BuildLogEntry(msg, span, LogLevel.WARNING.name));
   }
 
   /// Records an error message. If [msg] is a [Message] it is recorded
   /// directly, otherwise it is first converted to a [String].
-  void error(msg, {AssetId asset, SourceSpan span}) {
+  void error(Object msg, {AssetId asset, SourceSpan span}) {
     msg = msg is Message ? msg : new Message.unknown('$msg');
     if (convertErrorsToWarnings) {
       _transform.logger.warning(_snippet(msg), asset: asset, span: span);
     } else {
       _transform.logger.error(_snippet(msg), asset: asset, span: span);
     }
     _logs.add(new BuildLogEntry(msg, span, LogLevel.ERROR.name));
   }
 
   String _snippet(Message msg) {
     var s = msg.snippet;
     if (detailsUri == null) return s;
     var dot = s.endsWith('.') || s.endsWith('!') || s.endsWith('?') ? '' : '.';
     var hashTag = '${msg.id.package}_${msg.id.id}';
     return '$s$dot See $detailsUri#$hashTag for details.';
   }
 
   /// Outputs the log data to a JSON serialized file.
   Future writeOutput() {
     return _getNextLogAssetId().then((id) {
       _transform.addOutput(new Asset.fromString(id, JSON.encode(_logs)));
     });
   }
 
   // Each phase outputs a new log file with an incrementing # appended, this
   // figures out the next # to use.
-  Future<AssetId> _getNextLogAssetId([int nextNumber = 1]) {
+  Future<AssetId> _getNextLogAssetId([int nextNumber = 1]) async {
     var nextAssetPath = _primaryId.addExtension('${LOG_EXTENSION}.$nextNumber');
-    return _transform.hasInput(nextAssetPath).then((exists) {
-      if (!exists) return nextAssetPath;
-      return _getNextLogAssetId(++nextNumber);
-    });
+    bool exists = await _transform.hasInput(nextAssetPath);
+    if (!exists) return nextAssetPath;
+    return _getNextLogAssetId(++nextNumber);
   }
 
   // Reads all log files for an Asset into [logs].
   static Future _readLogFilesForAsset(
       AssetId id, Transform transform, LogEntryTable entries,
       [nextNumber = 1]) {
     var nextAssetPath = id.addExtension('${LOG_EXTENSION}.$nextNumber');
     return transform.hasInput(nextAssetPath).then((exists) {
       if (!exists) return null;
       return transform.readInputAsString(nextAssetPath).then((data) {
@@ skipping 17 matching lines @@
   }
 
   // Reads all logs for an asset and adds them to this loggers log output.
   Future addLogFilesFromAsset(AssetId id, [int nextNumber = 1]) {
     return _readLogFilesForAsset(id, _transform, _logs);
   }
 }
 
 /// Extension used for assets that contained serialized logs.
 const String LOG_EXTENSION = '._buildLogs';