make dart2js_info strong-mode clean

bin/coverage_log_server.dart

 // Copyright (c) 2015, 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 tool to gather coverage data from an app generated with dart2js. This
 /// depends on code that has been landed in the bleeding_edge version of dart2js
 /// and that we expect to become publicly visible in version 0.13.0 of the Dart
 /// SDK).
 ///
 /// This tool starts a server that answers to mainly 2 requests:
@@ skipping 11 matching lines @@
 import 'dart:convert';
 import 'dart:io';
 import 'dart:async';
 import 'package:path/path.dart' as path;
 import 'package:args/args.dart';
 import 'package:shelf/shelf.dart' as shelf;
 import 'package:shelf/shelf_io.dart' as shelf;
 
 const _DEFAULT_OUT_TEMPLATE = '<dart2js-out-file>.coverage.json';
 
-main(argv) async {
+main(List<String> argv) async {
   var parser = new ArgParser()
     ..addOption('port', abbr: 'p', help: 'port number', defaultsTo: "8080")
     ..addOption('host',
         help: 'host name (use 0.0.0.0 for all interfaces)',
         defaultsTo: 'localhost')
     ..addFlag('help',
         abbr: 'h', help: 'show this help message', negatable: false)
     ..addOption('uri-prefix',
         help: 'uri path prefix that will hit this server. This will be injected'
             ' into the .js file',
@@ skipping 119 matching lines @@
   }
 
   bool _savePending = false;
   int _total = 0;
   _enqueueSave() async {
     if (!_savePending) {
       _savePending = true;
       await new Future.delayed(new Duration(seconds: 3));
       await new File(outPath).writeAsString(_serializedData);
       var diff = data.length - _total;
-      print(
-          diff ? ' - no new element covered' : ' - $diff new elements covered');
+      print(diff == 0
+          ? ' - no new element covered'
+          : ' - $diff new elements covered');
       _savePending = false;
       _total = data.length;
     }
   }
 }
 
 /// Removes leading and trailing slashes of [uriPath].
 _normalize(String uriPath) {
   if (uriPath.startsWith('/')) uriPath = uriPath.substring(1);
   if (uriPath.endsWith('/')) uriPath = uriPath.substring(0, uriPath.length - 1);
   return uriPath;
 }
 
 _adjustRequestUrl(String code, String prefix) {
   var newUrl = prefix == '' ? 'coverage' : '$prefix/coverage';
   return code.replaceFirst('"/coverage_uri_to_amend_by_server"',
       '"/$newUrl" /*url-prefix updated!*/');
 }
 
 const HTML_HEADERS = const {'content-type': 'text/html'};
 const JS_HEADERS = const {'content-type': 'text/javascript'};
 const TEXT_HEADERS = const {'content-type': 'text/plain'};