Install hangs at webpack about jupyterlab-latex HOT 18 CLOSED

PDF.js, on which this extension relies, is a large and complex library, and including it makes the webpack build take significantly longer than it is otherwise (for me it takes almost a minute). How long did you wait for the build?

We would like to be able to split the pdf.js part of the build into a separate chunk, and the newly released webpack 4 is supposed to be faster, so there are some performance improvements that are possible.

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I was waiting for approximately a bit over 4 hours on that command. For reference, I am building on WSL, but node, webpack, yarn, etc. do not have any compatibility problems individually with WSL that I know of.

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Ah, well that certainly seems like it is hanging :)
I'll try rebooting into windows and see if I can reproduce.

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Update: inside the package.json in ~/.pyenv/versions/3.5.5/lib/python3.5/site-packages/jupyterlab/staging, I replaced "build:prod": "webpack --config webpack.prod.config.js" with "build:prod": "webpack". The install works now! So it's not an extension issue.

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Do we have a way to migrate issues between repos on jupyterlab? I know @Carreau's meseeks bot could do it, but this should probably be closed here then.

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I was waiting on closing the issue for exactly that reason. If there's a way to migrate it, please let me know how to do so (or if I should file a new issue). Otherwise, I can close it! 😃

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I don't know how invoke meseeks to migrate the issue, but we can try to tag in @blink1073 to see if he has any ideas about what is going on here. But we should not be making you have to muck around in the package.json just to get an extension installed :)

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For what it's worth, this issue does not occur when installing jupyterlab from an egg, but it does happen when installing jupyterlab from source. Maybe a Webpack/Yarn/WSL/config issue?

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Hi @RitwikGupta, can you share what commands you used to install both jupyterlab and this extension? I can't figure out why this might be happening from that traceback.

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@blink1073 Certainly. For this traceback, I installed Jupyterlab on Python 3.6.4 with pip install jupyterlab. This installed without any problems from the egg on PyPi. To install the extension, I ran the commands on the README, namely:
pip install jupyterlab_latex
jupyter labextension install @jupyterlab/latex

These commands hang wherever the install script hits

yarn run v1.3.2
$ webpack --config webpack.prod.config.js

The webpack command hangs indefinitely and suppresses all output. To see if I could get a traceback, I manually ran node /home/ritwik/.pyenv/versions/3.6.4/lib/python3.6/site-packages/jupyterlab/staging/yarn.js run webpack --config webpack.prod.config.js from the Jupyterlab staging folder. This is where you will get this traceback.

If you change the build:prod target to just webpack in package.json, this works fine without any problems. It seems like --config webpack.prod.config.js is the thing causing issues.

Running on Windows Subsystem for Linux

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Hi @RitwikGupta, does it work with jupyter labextension install @jupyterlab/latex --dev (which avoids the production build).

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@blink1073 Yes, it does! Seems like that command invokes the build target, which calls the command webpack, which works. build:prod calls webpack --config webpack.prod.config.js, which does not work.

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I'm having the same issue with jupyterlab version 0.31.12

Even with no extensions installed, jupyter lab build tries to run webpack --config webpack.prod.config.js and hangs for a very long time, while jupyter lab build --dev just runs webpack and finishes in a few seconds.

So it seems to be the production config that's causing a problem.

Edit: Just realized this issue is in jupyterlab-latex -- in light of my situation (no extensions installed), I might go open an issue at jupyterlab proper.

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There's a thread about this at jupyterlab/jupyterlab#4276

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Installation in a fresh python=3 conda environment hangs on this issue.
(i.e. conda create - tex python=3 + source activate tex)

I tried the --dev option as outlined above, but no dice.
In addition I changed the "build" line in package.json as outlined above in the directory:
~/.conda/envs/tex/lib/python3.6/site-packages/jupyterlab/staging, but also didn't do much.

How long should it take to build the @jupyterlab/latex@file:../extensions/jupyterlab-latex-0.3.1.tgz?

Thanks!
J

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Hi folks, @TiemenSch has come up with a workaround for this problem, is there any chance you could check whether it fixes things here?

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I am using Nodejs 10,will hang on webpack,downgrade to 8.10.0, and install and run successfully.

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As of #171, the "prebuilt" extension mechanism is recommended, as it does not require nodejs.

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