Remove Runtime Dependency on Packaging (#10217)

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires=["jupyter_packaging~=0.9"]
+requires=["jupyter_packaging~=0.9,<2"]
 build-backend = "jupyter_packaging.build_api"
 
 [license]

setup.cfg

@@ -32,7 +32,6 @@ install_requires =
     packaging
     tornado>=6.1.0
     jupyter_core
-    jupyter_packaging~=0.9
     jupyterlab_server~=2.3
     jupyter_server~=1.4
     nbclassic~=0.2

setup.py

@@ -9,8 +9,6 @@ import os
 import os.path as osp
 import sys
 
-from jupyter_packaging import wrap_installers, npm_builder, get_data_files, get_version
-from packaging.version import Version
 from setuptools import setup
 
 NAME = "jupyterlab"
@@ -23,8 +21,20 @@ ensured_targets = [
 ]
 ensured_targets = [osp.join(HERE, NAME, t) for t in ensured_targets]
 
+data_files_spec = [
+    ('share/jupyter/lab/static', f'{NAME}/static', '**'),
+    ('share/jupyter/lab/schemas', f'{NAME}/schemas', '**'),
+    ('share/jupyter/lab/themes', f'{NAME}/themes', '**'),
+    ('etc/jupyter/jupyter_server_config.d',
+     'jupyter-config/jupyter_server_config.d', f'{NAME}.json'),
+    ('etc/jupyter/jupyter_notebook_config.d',
+     'jupyter-config/jupyter_notebook_config.d', f'{NAME}.json'),
+]
 
 def post_dist():
+    from packaging.version import Version
+    from jupyter_packaging import get_version
+
     target = pjoin(HERE, NAME, 'static', 'package.json')
     with open(target) as fid:
         version = json.load(fid)['jupyterlab']['version']
@@ -33,25 +43,22 @@ def post_dist():
         raise ValueError('Version mismatch, please run `build:update`')
 
 
-npm = ['node', pjoin(HERE, NAME, 'staging', 'yarn.js')]
-# In develop mode, just run yarn
-builder = npm_builder(build_cmd=None, npm=npm, force=True)
-cmdclass = wrap_installers(post_develop=builder, post_dist=post_dist, ensured_targets=ensured_targets)
+try:
+    from jupyter_packaging import wrap_installers, npm_builder, get_data_files
 
-data_files_spec = [
-    ('share/jupyter/lab/static', f'{NAME}/static', '**'),
-    ('share/jupyter/lab/schemas', f'{NAME}/schemas', '**'),
-    ('share/jupyter/lab/themes', f'{NAME}/themes', '**'),
-    ('etc/jupyter/jupyter_server_config.d',
-     'jupyter-config/jupyter_server_config.d', f'{NAME}.json'),
-    ('etc/jupyter/jupyter_notebook_config.d',
-     'jupyter-config/jupyter_notebook_config.d', f'{NAME}.json'),
-]
+    npm = ['node', pjoin(HERE, NAME, 'staging', 'yarn.js')]
+    # In develop mode, just run yarn
+    builder = npm_builder(build_cmd=None, npm=npm, force=True)
+    cmdclass = wrap_installers(post_develop=builder, post_dist=post_dist, ensured_targets=ensured_targets)
+
+
+    setup_args = dict(
+        cmdclass=cmdclass,
+        data_files=get_data_files(data_files_spec)
+    )
+except ImportError:
+    setup_args = dict()
 
-setup_args = dict(
-    cmdclass=cmdclass,
-    data_files=get_data_files(data_files_spec)
-)
 
 if __name__ == '__main__':
     setup(**setup_args)