Install not in editable mode

Author: fcollonval

package.json

@@ -7,7 +7,7 @@
     "build-ext": "lerna run build:all",
     "clean-ext": "lerna run clean",
     "embedme": "embedme \"[!n]*/**/README.md\"",
-    "install-py": "lerna exec --concurrency 4 -- python -m pip install -e .",
+    "install-py": "lerna exec --concurrency 4 -- python -m pip install . --use-feature=in-tree-build",
     "install-ext": "lerna run install:extension",
     "lint": "jlpm && jlpm run prettier",
     "lint:check": "jlpm run embedme --verify && jlpm run prettier:check",

postBuild

@@ -1,3 +1,3 @@
 jlpm
-jlpm run lerna exec -- python -m pip install -e .
+jlpm run install-py
 jupyter serverextension enable jlab_ext_example