Use smoke in polymer and polymer_expressions.

pkg/polymer/lib/deserialize.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 polymer.deserialize;
 
 import 'dart:convert' show JSON;
-import 'dart:mirrors' show TypeMirror;
 
-final _typeHandlers = () {
-  // TODO(jmesserly): switch to map and symbol literal form when supported.
-  var m = new Map();
-  m[#dart.core.String] = (x, _) => x;
-  m[#dart.core.Null] = (x, _) => x;
-  m[#dart.core.DateTime] = (x, def) {
+final _typeHandlers = {
+  String: (x, _) => x,
+  Null: (x, _) => x,
+  DateTime: (x, def) {
     // TODO(jmesserly): shouldn't need to try-catch here
     // See: https://code.google.com/p/dart/issues/detail?id=1878
     try {
       return DateTime.parse(x);
     } catch (e) {
       return def;
     }
-  };
-  m[#dart.core.bool] = (x, _) => x != 'false';
-  m[#dart.core.int] =
-      (x, def) => int.parse(x, onError: (_) => def);
-  m[#dart.core.double] =
-      (x, def) => double.parse(x, (_) => def);
-  return m;
-}();
+  },
+  bool: (x, _) => x != 'false',
+  int: (x, def) => int.parse(x, onError: (_) => def),
+  double: (x, def) => double.parse(x, (_) => def),
+};
 
-/**
- * Convert representation of [value] based on type of [currentValue].
- */
-Object deserializeValue(String value, Object currentValue, TypeMirror type) {
-  var handler = _typeHandlers[type.qualifiedName];
+/// Convert representation of [value] based on [type] and [currentValue].
+Object deserializeValue(String value, Object currentValue, Type type) {
+  var handler = _typeHandlers[type];
   if (handler != null) return handler(value, currentValue);
 
   try {
     // If the string is an object, we can parse is with the JSON library.
     // include convenience replace for single-quotes. If the author omits
     // quotes altogether, parse will fail.
     return JSON.decode(value.replaceAll("'", '"'));
 
     // TODO(jmesserly): deserialized JSON is not assignable to most objects in
     // Dart. We should attempt to convert it appropriately.
   } catch(e) {
     // The object isn't valid JSON, return the raw value
     return value;
   }
 }