haraldschilly
commented
5 years ago first attempt failed. reminds me of another yarn-based installation, where webpack was missing.
> node /usr/local/lib/python3.6/dist-packages/jupyterlab/staging/yarn.js install
yarn install v1.9.4
info No lockfile found.
warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix pack
age managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove packag
e-lock.json.
[1/5] Validating package.json...
[2/5] Resolving packages...
warning css-loader > cssnano > autoprefixer > browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config use
d in other tools.
warning css-loader > cssnano > postcss-merge-rules > browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 con
fig used in other tools.
warning css-loader > cssnano > postcss-merge-rules > caniuse-api > browserslist@1.7.7: Browserslist 2 could fail on reading Browser
slist >3.0 config used in other tools.
[3/5] Fetching packages...
info fsevents@1.2.7: The platform "linux" is incompatible with this module.
info "fsevents@1.2.7" is an optional dependency and failed compatibility check. Excluding it from installation.
[4/5] Linking dependencies...
warning "@jupyterlab/vdom-extension > @nteract/transform-vdom@1.1.1" has incorrect peer dependency "react@^15.6.1".
[5/5] Building fresh packages...
success Saved lockfile.
warning Your current version of Yarn is out of date. The latest version is "1.13.0", while you're on "1.9.4".
Done in 53.87s.
> node /usr/local/lib/python3.6/dist-packages/jupyterlab/staging/yarn.js run build
yarn run v1.9.4
$ webpack
/bin/sh: 1: webpack: not found
error Command failed with exit code 127.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command. 
williamstein
see https://groups.google.com/d/topic/cocalc/Ux1GlCaRiso/discussion