Split the JSON output into multiple lines.

pkg/dart_messages/lib/shared_messages.dart

Index: pkg/dart_messages/lib/shared_messages.dart
diff --git a/pkg/dart_messages/lib/shared_messages.dart b/pkg/dart_messages/lib/shared_messages.dart
index ff9329629aa74e3f9e042d9857ca8113ad415b94..a58cbbfa024e7c5afc7afac36a0ff98b381caf9e 100644
--- a/pkg/dart_messages/lib/shared_messages.dart
+++ b/pkg/dart_messages/lib/shared_messages.dart
@@ -138,9 +138,9 @@ class Message {
 }
 
 String get messagesAsJson {
-  var jsonified = {};
+  var jsonifiedEntries = [];
   MESSAGES.forEach((String name, Message message) {
-    jsonified[name] = {
+    jsonifiedEntries.add("'$name': " + JSON.encode({

[Siggi Cherem (dart-lang), 2016/02/18 20:55:02]

or use `const JsonEncoder.withIndent('  ').encode(jsonified)`?

[floitsch, 2016/02/18 21:00:48]

Even better.
Dart really has great libraries ;)

       'id': message.id,
       'subId': message.subId,
       'category': message.category.name,
@@ -150,9 +150,12 @@ String get messagesAsJson {
       'options': message.options,
       'usedBy': message.usedBy.map((platform) => platform.toString()).toList(),
       'examples': message.examples,
-    };
+    }));
   });
-  return JSON.encode(jsonified);
+  return """
+  {
+    ${jsonifiedEntries.join(",\n")}
+  }""";
 }
 
 final Map<String, Message> MESSAGES = {