code: function fullPath() {
      let result = state.path
      let stateParent = state.parent
  
      while (stateParent) {
        if (stateParent.path) result = stateParent.path + '/' + result
        stateParent = stateParent.parent
      }
  
      return result
    }
docs: /*
  The full path, composed of all the individual paths of this state and its parents.