code: function findModule(store, namespace) {
      return namespace.split('/').reduce(function (obj, key) {
          // root modules will exist directly on the store
          if (obj && obj[key]) {
              return obj[key];
          }
  
          // child stores will exist in a modules object
          if (obj && obj.modules && obj.modules[key]) {
              return obj.modules[key];
          }
  
          // if we couldn't find the module, throw an error
          // istanbul ignore next
          throw new Error('Could not find module "' + namespace + '" in store.');
      }, store);
  }
docs: helper to find vuex modules via their namespace