Allow install to use node in PATH

I’m getting an error when installing because it’s trying to use the node executable in my conda directory instead of the one on my PATH. I didn’t install node from Conda, so I’m assuming that’s a dependency of some other program.

The node from Conda is a lower version:

> ~/local/anaconda3/bin/node --version
v6.11.2

The node on my PATH is a higher version:

> node --version
v10.13.0

Especially when the error message says that node can be downloaded manually, I think the install should check if the node on the PATH is of a sufficiently high version.

Full install traceback:

> jupyter labextension install @jupyterlab/latex --debug
Searching ['/disk/agedisk3/medicare.work/doyle-DUA51929/barronk-dua51929/medicare-modernization/harmonization/code', '/disk/homedirs/barronk-dua51929/.jupyter', '/homes/nber/barronk-dua51929/local/anaconda3/etc/jupyter', '/usr/local/etc/jupyter', '/etc/jupyter'] for config files
Looking for jupyter_config in /etc/jupyter
Looking for jupyter_config in /usr/local/etc/jupyter
Looking for jupyter_config in /homes/nber/barronk-dua51929/local/anaconda3/etc/jupyter
Looking for jupyter_config in /disk/homedirs/barronk-dua51929/.jupyter
Looking for jupyter_config in /disk/agedisk3/medicare.work/doyle-DUA51929/barronk-dua51929/medicare-modernization/harmonization/code
Traceback (most recent call last):

  File "/homes/nber/barronk-dua51929/local/anaconda3/lib/python3.6/site-packages/jupyterlab/commands.py", line 1483, in _node_check
    output = subprocess.check_output([node, 'node-version-check.js'], cwd=HERE)

  File "/homes/nber/barronk-dua51929/local/anaconda3/lib/python3.6/subprocess.py", line 336, in check_output
    **kwargs).stdout

  File "/homes/nber/barronk-dua51929/local/anaconda3/lib/python3.6/subprocess.py", line 418, in run
    output=stdout, stderr=stderr)

subprocess.CalledProcessError: Command '['/homes/nber/barronk-dua51929/local/anaconda3/bin/node', 'node-version-check.js']' returned non-zero exit status 1.


During handling of the above exception, another exception occurred:


Traceback (most recent call last):

  File "/homes/nber/barronk-dua51929/local/anaconda3/lib/python3.6/site-packages/jupyterlab/labextensions.py", line 77, in start
    ans = self.run_task()

  File "/homes/nber/barronk-dua51929/local/anaconda3/lib/python3.6/site-packages/jupyterlab/labextensions.py", line 106, in run_task
    for arg in self.extra_args

  File "/homes/nber/barronk-dua51929/local/anaconda3/lib/python3.6/site-packages/jupyterlab/labextensions.py", line 106, in <listcomp>
    for arg in self.extra_args

  File "/homes/nber/barronk-dua51929/local/anaconda3/lib/python3.6/site-packages/jupyterlab/commands.py", line 217, in install_extension
    _node_check(logger)

  File "/homes/nber/barronk-dua51929/local/anaconda3/lib/python3.6/site-packages/jupyterlab/commands.py", line 1489, in _node_check
    raise ValueError(msg)

ValueError: Please install nodejs >=6.11.5 before continuing. nodejs may be installed using conda or directly from the nodejs website.


Errored, use --debug for full output:
ValueError: Please install nodejs >=6.11.5 before continuing. nodejs may be installed using conda or directly from the nodejs website

[bollwyvl]

As of #171, the “prebuilt” distribution mechanism is preferred, which does not require nodejs.

[ian-r-rose]

Sure, please do. I think there are some prior issues regarding which environment the jupyter command uses (and I’m not entirely sure what the correct behavior is in this case), but I am unable to find them at the moment.