gistfile1.js

 258 let labelledItemRules =  mix(baseItemRules, {
 259   label: {
 260     map: stringOrNull,
 261     is: ["string"],
 262     ok: function (v) !!v,
 263     msg: "The item must have a non-empty string label."
 264   },
 265   image: {
 266     map: stringOrNull,
 267     is: ["string", "undefined", "null"],
 268     ok: function (url) {
 269       if (!url)
 270         return false;
 271       return isLocalURL(url);
 272       //return true;
 273     }
 274   }
 275 });
 276 
 277 // Validation for image URL
 278 function isLocalURL(url) {
 279   try {
 280     return ['resource', 'data'].indexOf(URL(url).scheme) > -1;
 281   }
 282   catch(e) {}
 283   return false;
 284 }
 285