routing.js

const Routing = DefineMap.extend('MyDocRouting', {
  item: {
    Type: Item,
    set(newValue) {
      this.itemId = newValue && newValue.id ? newValue.id : undefined;
      return newValue;
    },
    serialize: false
  },
  itemId: {
    type: 'string'
  },

  listHash: {
    Value: DefineMap,
    serialize: false
  },

  deeplink(allItems) {
    const itemId = this.itemId;
    this.listHash.assignDeep(getHashOfFoldersList(allItems)); // creates a flat object { key: item }

    if (this.listHash[itemId]) {
      this.item = this.listHash[itemId];
      this.dispatch('itemId', [itemId]);
    } else {
      mydocState.itemsLoading = true;
      Folder.getPath(itemId).then(this._getFolderPath.bind(this), error => {
        console.error(error);
      });
    }
  },

  _getFolderPath(path) {
    const itemId = this.itemId;
    const foldersToRequest = path.filter(
      pathId => (this.listHash[pathId] && this.listHash[pathId].children ? false : true)
    );
    const foldersToOpen = path.filter(
      pathId => (this.listHash[pathId] && this.listHash[pathId].children ? true : false)
    );
    foldersToOpen.forEach(pathId => {
      if (this.listHash[pathId] && this.listHash[pathId].isOpened === false) {
        this.listHash[pathId].isOpened = true;
      }
    });

    const promises = [];
    foldersToRequest.forEach(pathId => {
      promises.push(DirectoryListing.getItems(mydocState.defaultPages.files, pathId));
    });

    Promise.all(promises).then(
      values => {
        try {
          let deeplinkFound = false;
          values.forEach((data, idx) => {
            const pathId = foldersToRequest[idx];
            this.listHash.assignDeep(getHashOfFoldersList(data));
            if (this.listHash[pathId]) {
              const folder = this.listHash[pathId];
              folder.children = data;
              folder.childrenSetHelper = true;
              folder.isOpened = true;

              if (idx === foldersToRequest.length - 1) {
                const deeplinkItem = folder.children.filter(item => item.id === itemId);
                if (deeplinkItem.length === 1) {
                  deeplinkFound = true;
                  this.item = deeplinkItem[0];
                  this.dispatch('itemId', [itemId]);
                }
              }
            }
          });
          if (!deeplinkFound) {
            this.item = this.listHash[mydocState.defaultPages.files];
          }
        } catch (err) {
          throw err;
        }
      },
      error => {
        console.error(error);
      }
    );
  }
});