debug

jupyterlab/commands.py

@@ -1472,7 +1472,7 @@ def _node_check():
     """Check for the existence of nodejs with the correct version.
     """
     try:
-        proc = Process(['node', 'node-version-check.js'], cwd=HERE, quiet=True)
+        proc = Process(['node', 'node-version-check.js'], cwd=HERE, quiet=False)
         ret = proc.wait()
     except Exception:
         ret = 1

jupyterlab/node-version-check.js

@@ -11,6 +11,8 @@ var eparts = engine.split('.').map(parser);
 var version = process.version.replace('v', '');
 var vparts = version.split('.').map(parser);
 
+console.log(eparts); // eslint-disable-line
+console.log(vparts); // eslint-disable-line
 if (vparts[0] > eparts[0]) {
   process.exit(0);
 }