metadata-generation-failed when trying to follow basic instructions

[AaronWatters]

Hi folks. I tried to follow the instructions in the README and here
https://ipywidgets.readthedocs.io/en/8.0.2/examples/Widget%20Custom.html
and in both cases I get the following.

$ python -m pip install -e .
Obtaining file:///Users/awatters/ipyemail
  Installing build dependencies ... done
  Checking if build backend supports build_editable ... done
  Getting requirements to build editable ... done
  Installing backend dependencies ... done
  Preparing editable metadata (pyproject.toml) ... error
  error: subprocess-exited-with-error
  
  × Preparing editable metadata (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [60 lines of output]
      INFO:hatch_jupyter_builder.utils:Running jupyter-builder
      INFO:hatch_jupyter_builder.utils:Building with hatch_jupyter_builder.npm_builder
      INFO:hatch_jupyter_builder.utils:With kwargs: {'path': '.', 'build_cmd': 'build:prod'}
      INFO:hatch_jupyter_builder.utils:Installing build dependencies with npm.  This may take a while...
      INFO:hatch_jupyter_builder.utils:> /opt/anaconda3/envs/ipyemail/bin/npm install
      npm ERR! code ERESOLVE
      npm ERR! ERESOLVE unable to resolve dependency tree
      npm ERR!
      npm ERR! While resolving: [email protected]
      npm ERR! Found: jest@undefined
      npm ERR! node_modules/jest
      npm ERR!   dev jest@"^26.0.0" from the root project
      npm ERR!
      npm ERR! Could not resolve dependency:
      npm ERR! peer jest@">=26 <27" from [email protected]
      npm ERR! node_modules/ts-jest
      npm ERR!   dev ts-jest@"^26.0.0" from the root project
      npm ERR!
      npm ERR! Fix the upstream dependency conflict, or retry
      npm ERR! this command with --force, or --legacy-peer-deps
      npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
      npm ERR!
      npm ERR! See /Users/awatters/.npm/eresolve-report.txt for a full report.
      
      npm ERR! A complete log of this run can be found in:
      npm ERR!     /Users/awatters/.npm/_logs/2023-03-06T17_13_40_323Z-debug-0.log
      Traceback (most recent call last):
        File "/opt/anaconda3/envs/ipyemail/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 167, in prepare_metadata_for_build_editable
          hook = backend.prepare_metadata_for_build_editable
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      AttributeError: module 'hatchling.build' has no attribute 'prepare_metadata_for_build_editable'
      
      During handling of the above exception, another exception occurred:
      
      Traceback (most recent call last):
        File "/opt/anaconda3/envs/ipyemail/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
          main()
        File "/opt/anaconda3/envs/ipyemail/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/opt/anaconda3/envs/ipyemail/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 176, in prepare_metadata_for_build_editable
          whl_basename = build_hook(metadata_directory, config_settings)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/private/var/folders/6q/d5mwddn12v7_pkq3_6cc5t8c0000gq/T/pip-build-env-zr78fuae/overlay/lib/python3.11/site-packages/hatchling/build.py", line 78, in build_editable
          return os.path.basename(next(builder.build(wheel_directory, ['editable'])))
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/private/var/folders/6q/d5mwddn12v7_pkq3_6cc5t8c0000gq/T/pip-build-env-zr78fuae/overlay/lib/python3.11/site-packages/hatchling/builders/plugin/interface.py", line 150, in build
          build_hook.initialize(version, build_data)
        File "/private/var/folders/6q/d5mwddn12v7_pkq3_6cc5t8c0000gq/T/pip-build-env-zr78fuae/normal/lib/python3.11/site-packages/hatch_jupyter_builder/plugin.py", line 83, in initialize
          raise e
        File "/private/var/folders/6q/d5mwddn12v7_pkq3_6cc5t8c0000gq/T/pip-build-env-zr78fuae/normal/lib/python3.11/site-packages/hatch_jupyter_builder/plugin.py", line 78, in initialize
          build_func(self.target_name, version, **build_kwargs)
        File "/private/var/folders/6q/d5mwddn12v7_pkq3_6cc5t8c0000gq/T/pip-build-env-zr78fuae/normal/lib/python3.11/site-packages/hatch_jupyter_builder/utils.py", line 114, in npm_builder
          run(npm_cmd + ["install"], cwd=str(abs_path))
        File "/private/var/folders/6q/d5mwddn12v7_pkq3_6cc5t8c0000gq/T/pip-build-env-zr78fuae/normal/lib/python3.11/site-packages/hatch_jupyter_builder/utils.py", line 227, in run
          return subprocess.check_call(cmd, **kwargs)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/opt/anaconda3/envs/ipyemail/lib/python3.11/subprocess.py", line 413, in check_call
          raise CalledProcessError(retcode, cmd)
      subprocess.CalledProcessError: Command '['/opt/anaconda3/envs/ipyemail/bin/npm', 'install']' returned non-zero exit status 1.
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

I checked that I have the latest node and npm recommended for mac and I'm running python 3.11.0 if that matters.

[ianhi]

I think this is the same as #124 and hopefully fixed by #127