`jupyterlab` 无法识别 `nodejs` 和 `npm` 安装

Question

我在安装 jupyterlab_bokeh 扩展时遇到问题。

$ jupyter labextension install jupyterlab_bokeh
Errored, use --debug for full output:
ValueError: Please install nodejs and npm before continuing installation. nodejs may be installed using conda or directly from the nodejs website.

我正在使用虚拟环境（pyenv 加上 pyenv-virtualenvwrapper）。我尝试先在我的本地 OS (Ubuntu 16.04) 上安装这两个软件包，然后重新安装 jupyterlab 但这没有帮助。我还尝试在虚拟环境中通过 pip 安装 nodejs 和 npm，在我的 OS 上卸载软件包后，只是为了确保它们没有冲突.可惜，试探性的都没有成功。

奇怪的是，如果我在终端上输入 nodejs 命令，我可以访问 nodejs REPL。

bokeh==0.12.13
jupyter-client==5.2.1
jupyter-core==4.4.0
jupyterlab==0.31.1
jupyterlab-launcher==0.10.2

问题不限于扩展 jupyterlab_bokeh。我可以使用扩展名 jupyterlab-manager.

复制相同的错误

我实际上注意到，如果我运行 jupyter labextension list 我可以看到两个扩展都已正确安装：

$ jupyter labextension list
JupyterLab v0.31.1
Known labextensions:
   app dir: /home/gianluca/.virtualenvs/rethinking/share/jupyter/lab
@jupyter-widgets/jupyterlab-manager
        @jupyter-widgets/jupyterlab-manager v0.33.0  enabled  OK
jupyterlab_bokeh
        jupyterlab_bokeh v0.2.0  enabled  OK

Build recommended, please run `jupyter lab build`:
    @jupyter-widgets/jupyterlab-manager needs to be included in build
    jupyterlab_bokeh needs to be included in build

但是，正如您在上面的片段中看到的，建议使用内置的。如果我尝试运行构建，这是我看到的错误消息：

$ jupyter lab build
[LabBuildApp] > node /home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyterlab/staging/yarn.js install
Traceback (most recent call last):
  File "/home/gianluca/.virtualenvs/rethinking/bin/jupyter-lab", line 11, in <module>
    sys.exit(main())
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyter_core/application.py", line 266, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/traitlets/config/application.py", line 658, in launch_instance
    app.start()
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/notebook/notebookapp.py", line 1431, in start
    super(NotebookApp, self).start()
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyter_core/application.py", line 255, in start
    self.subapp.start()
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyterlab/labapp.py", line 64, in start
    command=command, logger=self.log)
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyterlab/commands.py", line 238, in build
    command=command, clean_staging=clean_staging)
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyterlab/commands.py", line 376, in build
    self._run(['node', YARN_PATH, 'install'], cwd=staging)
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyterlab/commands.py", line 1158, in _run
    proc = Process(cmd, **kwargs)
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyterlab/process.py", line 72, in __init__
    self.proc = self._create_process(cwd=cwd, env=env)
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyterlab/process.py", line 130, in _create_process
    cmd[0] = which(cmd[0], kwargs.get('env'))
  File "/home/gianluca/.virtualenvs/rethinking/lib/python3.6/site-packages/jupyterlab/jlpmapp.py", line 59, in which
    raise ValueError(msg)
ValueError: Please install nodejs and npm before continuing installation. nodejs may be installed using conda or directly from the nodejs website.

同样，nodejs 和 npm 都安装在操作系统中。

Answer 1

尝试使用

安装 nodejs legacy

sudo apt install nodejs-legacy

或者您可以

sudo ln -s /usr/bin/nodejs /usr/bin/node

问题是 jupyter 期望 nodejs 使用命令 node 可用，但现在不是这样了

Answer 2

问题与安装的 nodejs 版本有关。 Ubuntu 16.04 LTS 附带 v4.2.6。我已经解决了安装 nodejs v6 的问题。如果需要在Ubuntu 16.04 LTS安装，可以按照this excellent tutorial.

Answer 3

确保从 jupyter 的终端而不是从笔记本中安装 nodejs。

`jupyterlab` 无法识别 `nodejs` 和 `npm` 安装

`jupyterlab` doesn't recognize `nodejs` and `npm` installations

ubuntu

node.js

bokeh

jupyter-lab