Dev: Use web worker for performance optimization

package.json

@@ -19,12 +19,18 @@
   "eustia": {
     "eruda": {
       "files": "src/**/*.js",
+      "ignore": "src/**/stringify.js",
       "output": "src/lib/util.js",
       "exclude": [
         "createCfg"
       ],
       "format": "es"
     },
+    "stringify": {
+      "files": "src/lib/stringify.js",
+      "output": "src/lib/stringifyUtil.js",
+      "format": "es"
+    },
     "test": {
       "files": [
         "test/*.js",
@@ -86,6 +92,7 @@
     "remap-istanbul": "^0.9.5",
     "sass-loader": "^6.0.6",
     "webpack": "^3.10.0",
-    "webpack-dev-server": "^2.9.7"
+    "webpack-dev-server": "^2.9.7",
+    "worker-loader": "^1.1.0"
   }
 }