[Python-modules-team] Bug#950094: ipywidgets FTBFS with node-semver 7.1.1-2

[Adrian Bunk]

Source: ipywidgets
Version: 6.0.0-6
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ipywidgets.html

...
rm -rf "fakewebpack/widgetsnbextension" && mkdir -p "fakewebpack/widgetsnbextension" && ./fakewebpack-generate.py fakewebpack-meta/widgetsnbextension.files fakewebpack-meta/widgetsnbextension.modules fakewebpack-unpacked/widgetsnbextension/ True > "fakewebpack/widgetsnbextension/extension.js" && touch "fakewebpack/widgetsnbextension.stamp"
fs.js:114
    throw err;
    ^

Error: ENOENT: no such file or directory, open './node_modules/semver/semver.js'
    at Object.openSync (fs.js:443:3)
    at Object.readFileSync (fs.js:343:35)
    at Object.<anonymous> (/build/1st/ipywidgets-6.0.0/debian/fakewebpack-postprocess.js:233:19)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
    at startup (internal/bootstrap/node.js:283:19)
module 00: nodejs ../../fakewebpack-postprocess.js ./src/extension.js ../../fakewebpack-meta/widgetsnbextension.modules
module 01: nodejs ../../fakewebpack-postprocess.js ./src/manager.js ../../fakewebpack-meta/widgetsnbextension.modules
module 02: nodejs ../../fakewebpack-postprocess.js ./node_modules/underscore/underscore.js ../../fakewebpack-meta/widgetsnbextension.modules
module 03: nodejs ../../fakewebpack-postprocess.js ./node_modules/backbone/backbone.js ../../fakewebpack-meta/widgetsnbextension.modules
module 04: nodejs ../../fakewebpack-postprocess.js ./node_modules/jquery/dist/jquery.js ../../fakewebpack-meta/widgetsnbextension.modules
module 05: nodejs ../../fakewebpack-postprocess.js ./node_modules/jupyter-js-widgets/lib/index.js ../../fakewebpack-meta/widgetsnbextension.modules
module 06: nodejs ../../fakewebpack-postprocess.js ./node_modules/jupyter-js-widgets/lib/manager-base.js ../../fakewebpack-meta/widgetsnbextension.modules
module 07: nodejs ../../fakewebpack-postprocess.js ./node_modules/jupyter-js-widgets/lib/utils.js ../../fakewebpack-meta/widgetsnbextension.modules
module 08: nodejs ../../fakewebpack-postprocess.js ./node_modules/semver/semver.js ../../fakewebpack-meta/widgetsnbextension.modules
Traceback (most recent call last):
  File "./fakewebpack-generate.py", line 97, in <module>
    sys.exit(main(*sys.argv[1:]))
  File "./fakewebpack-generate.py", line 66, in main
    cwd=srcdir).decode("utf-8")
  File "/usr/lib/python3.7/subprocess.py", line 411, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.7/subprocess.py", line 512, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['nodejs', '../../fakewebpack-postprocess.js', './node_modules/semver/semver.js', '../../fakewebpack-meta/widgetsnbextension.modules']' returned non-zero exit status 1.
make[2]: *** [fakewebpack.mk:77: fakewebpack/widgetsnbextension.stamp] Error 1