docs: function (key) {
        var proto = this.proto();
        var possibleDesc = proto[key];
        var desc = possibleDesc !== null && typeof possibleDesc === 'object' && possibleDesc.isDescriptor ? possibleDesc : undefined;
  
        _emberMetalDebug.assert('metaForProperty() could not find a computed property ' + 'with key \'' + key + '\'.', !!desc && desc instanceof _emberMetalComputed.ComputedProperty);
        return desc._meta || {};
      }