"jupyter lab build" fails with Invalid regular expression

JupyterLab
1

Dear all,

I’m running a fresh new jupyterhub 1.4.1 installtion follwoing the offcial docs.

$ jupyterhub --version
1.4.1

$ jupyter --version
jupyter core     : 4.7.1
jupyter-notebook : 6.4.0
qtconsole        : not installed
ipython          : 7.24.1
ipykernel        : 5.5.5
jupyter client   : 6.1.12
jupyter lab      : 3.0.16
nbconvert        : 6.0.7
ipywidgets       : 7.6.3
nbformat         : 5.1.3
traitlets        : 5.0.5

The hub is up and running and now I’d like to add Jupyterlab extension.
the package is installed (among others):

$ pip list|grep -i lab
jupyterlab                        3.0.16
jupyterlab-git                    0.30.1
jupyterlab-pygments               0.1.2
jupyterlab-server                 2.6.0
jupyterlab-widgets                1.0.0

$ jupyter labextension list
JupyterLab v3.0.16

Build recommended, please run `jupyter lab build`:
    No built application

but when I build it always fails with the next error:

[LabBuildApp] Node v12.19.0
[LabBuildApp] Yarn configuration loaded.
[LabBuildApp] Building jupyterlab assets (production, minimized)
[LabBuildApp] > node /apps/prod/easybuild/sl7.x86_64.foss-2021a/software/jupyterhub/1.4.1-foss-2021a-Python-3.9.5/lib/python3.9/site-packages/jupyterlab/staging/yarn.js install --non-interactive
[LabBuildApp] yarn install v1.21.1
[1/5] Validating package.json...
[2/5] Resolving packages...
success Already up-to-date.
Done in 0.46s.
[...]
[LabBuildApp] > node /apps/prod/easybuild/sl7.x86_64.foss-2021a/software/jupyterhub/1.4.1-foss-2021a-Python-3.9.5/lib/python3.9/site-packages/jupyterlab/staging/yarn.js run build:prod:minimize
[LabBuildApp] yarn run v1.21.1
$ webpack --config webpack.prod.minimize.config.js
[webpack-cli] SyntaxError: Invalid regular expression: /(\p{Uppercase_Letter}+|\p{Lowercase_Letter}|\d)(\p{Uppercase_Letter}+)/: Invalid property name
    at pathToArgumentName (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack/lib/cli.js:66:4)
    at addFlag (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack/lib/cli.js:170:16)
    at traverse (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack/lib/cli.js:243:21)
    at traverse (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack/lib/cli.js:299:23)
    at traverse (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack/lib/cli.js:248:24)
    at Object.getArguments (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack/lib/cli.js:308:2)
    at WebpackCLI.getBuiltInOptions (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack-cli/lib/webpack-cli.js:591:47)
    at loadCommandByName (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack-cli/lib/webpack-cli.js:732:38)
    at Command.<anonymous> (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack-cli/lib/webpack-cli.js:1260:23)
    at Command.listener [as _actionHandler] (/apps/prod/easybuild/sl7.x86_64.foss-2021a/software/Python/3.9.5-GCCcore-10.3.0-bare/share/jupyter/lab/staging/node_modules/webpack-cli/node_modules/commander/index.js:922:31)
error Command failed with exit code 2.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[LabBuildApp] JupyterLab failed to build

I do not undertand the error at all. Anyone could give me hand, please?

TIA,

2

This looks like an issue with JupyterLab and not JupyterHub, so I’ve changed the category on your topic.

3

Hi, I have the same issue. Did you get the solution?

4

Node 12 (as in the original question) appears a bit old at this time. Maybe this is the culprit? Also, do you really need to build?

5

Hi ~,
Thanks a lot for your reply. I am using Node 18.15, webpack 5.81.0 webpack-cli 5.0.2. Please see the log info below:
[LabBuildApp] Building in /Users/shanksdang/opt/anaconda3/envs/test/share/jupyter/lab
[LabBuildApp] Node v18.15.0

[LabBuildApp] Yarn configuration loaded.
[LabBuildApp] Building jupyterlab assets (production, minimized)
[LabBuildApp] > node /Users/shanksdang/opt/anaconda3/envs/test/lib/python3.10/site-packages/jupyterlab/staging/yarn.js install --non-interactive
[LabBuildApp] yarn install v1.21.1
warning …/…/…/…/…/…/…/…/package.json: No license field
[1/5] Validating package.json…
[2/5] Resolving packages…
success Already up-to-date.
Done in 0.17s.

[LabBuildApp] > node /Users/shanksdang/opt/anaconda3/envs/test/lib/python3.10/site-packages/jupyterlab/staging/yarn.js yarn-deduplicate -s fewer --fail
[LabBuildApp] yarn run v1.21.1
warning …/…/…/…/…/…/…/…/package.json: No license field
$ /Users/shanksdang/opt/anaconda3/envs/test/share/jupyter/lab/staging/node_modules/.bin/yarn-deduplicate -s fewer --fail
Done in 0.37s.

[LabBuildApp] > node /Users/shanksdang/opt/anaconda3/envs/test/lib/python3.10/site-packages/jupyterlab/staging/yarn.js run build:prod:minimize
[LabBuildApp] yarn run v1.21.1
warning …/…/…/…/…/…/…/…/package.json: No license field
$ webpack --config webpack.prod.minimize.config.js
[webpack-cli] /Users/shanksdang/opt/anaconda3/envs/test/share/jupyter/lab/staging/node_modules/webpack/lib/cli.js:67
/(\p{Uppercase_Letter}+|\p{Lowercase_Letter}|\d)(\p{Uppercase_Letter}+)/gu,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

SyntaxError: Invalid regular expression: /(\p{Uppercase_Letter}+|\p{Lowercase_Letter}|\d)(\p{Uppercase_Letter}+)/: Invalid property name
at new Script (node:vm:100:7)
at NativeCompileCache._moduleCompile (/Users/shanksdang/opt/anaconda3/envs/test/share/jupyter/lab/staging/node_modules/v8-compile-cache/v8-compile-cache.js:240:18)
at Module._compile (/Users/shanksdang/opt/anaconda3/envs/test/share/jupyter/lab/staging/node_modules/v8-compile-cache/v8-compile-cache.js:184:36)
at Module._extensions…js (node:internal/modules/cjs/loader:1308:10)
at Module.load (node:internal/modules/cjs/loader:1117:32)
at Module._load (node:internal/modules/cjs/loader:958:12)
at Module.require (node:internal/modules/cjs/loader:1141:19)
at require (/Users/shanksdang/opt/anaconda3/envs/test/share/jupyter/lab/staging/node_modules/v8-compile-cache/v8-compile-cache.js:159:20)
at get cli (/Users/shanksdang/opt/anaconda3/envs/test/share/jupyter/lab/staging/node_modules/webpack/lib/index.js:120:10)
at Function.cli (/Users/shanksdang/opt/anaconda3/envs/test/share/jupyter/lab/staging/node_modules/webpack/lib/util/memoize.js:22:13)
error Command failed with exit code 2.
info Visit yarn run | Yarn for documentation about this command.

[LabBuildApp] JupyterLab failed to build
[LabBuildApp] Traceback (most recent call last):

[LabBuildApp] File “/Users/shanksdang/opt/anaconda3/envs/test/lib/python3.10/site-packages/jupyterlab/debuglog.py”, line 47, in debug_logging
yield

[LabBuildApp] File “/Users/shanksdang/opt/anaconda3/envs/test/lib/python3.10/site-packages/jupyterlab/labapp.py”, line 196, in start
raise e

[LabBuildApp] File “/Users/shanksdang/opt/anaconda3/envs/test/lib/python3.10/site-packages/jupyterlab/labapp.py”, line 187, in start
build(

[LabBuildApp] File “/Users/shanksdang/opt/anaconda3/envs/test/lib/python3.10/site-packages/jupyterlab/commands.py”, line 506, in build
return handler.build(

[LabBuildApp] File “/Users/shanksdang/opt/anaconda3/envs/test/lib/python3.10/site-packages/jupyterlab/commands.py”, line 722, in build
raise RuntimeError(msg)

[LabBuildApp] RuntimeError: JupyterLab failed to build

[LabBuildApp] Exiting application: JupyterLab