Generating the correct type of a property which is a constant string

from .msg

Fix #488

Author: Minggang Wang

rosidl_gen/generator.json

@@ -1,6 +1,6 @@
 {
   "name": "rosidl-generator",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Generate JavaScript object from ROS IDL(.msg) files",
   "main": "index.js",
   "authors": [

rosidl_gen/templates/message.dot

@@ -757,7 +757,11 @@ class {{=arrayWrapper}} {
 {{? it.spec.constants != undefined && it.spec.constants.length}}
 // Define constants ({{=it.spec.constants.length}} in total)
 {{~ it.spec.constants :c}}
+{{? c.type === "string"}}
+Object.defineProperty({{=objectWrapper}}, "{{=c.name}}", {value: "{{=c.value}}", writable: false, enumerable: true, configurable: true});
+{{?? true}}
 Object.defineProperty({{=objectWrapper}}, "{{=c.name}}", {value: {{=c.value}}, writable: false, enumerable: true, configurable: true});
+{{?}}
 {{~}}
 {{?}}