How does `jupyter labextension list` determine if an extension is outdated?

krassowski · June 18, 2021, 9:04am

It does not know anything about new versions/releases of the extension; instead it compares what version of JupyterLab the extension requests/was built for and checks if this is older than the current version of JupyterLab.

Say your extension depends on packages @jupyterlab/something in version 2.0 but you are running JupyterLab 3.0 - this is when you should expect this error. The code that checks this is in:

github.com

jupyterlab/jupyterlab/blob/f0790b3ffd187b7dc923156b8ae227855abecefb/jupyterlab/commands.py#L1481-L1496

    
      
          def _get_extension_compat(self):
              """Get the extension compatibility info.
              """
              compat = dict()
              core_data = self.info['core_data']
              seen = set()
              for (name, data) in self.info['federated_extensions'].items():
                  deps = data['dependencies']
                  compat[name] = _validate_compatibility(name, deps, core_data)
                  seen.add(name)
              for (name, data) in self.info['extensions'].items():
                  if name in seen:
                      continue
                  deps = data['dependencies']
                  compat[name] = _validate_compatibility(name, deps, core_data)
              return compat

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How does `jupyter labextension list` determine if an extension is outdated?

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