Default clean script to clean the lab extension (#220)

* Default clean script to clean the lab extension

* releaser: clean state before building python

package.json

@@ -72,8 +72,11 @@
   "jupyter-releaser": {
     "hooks": {
       "before-build-npm": [
-        "jlpm",
-        "jlpm run build:prod"
+        "jlpm clean",
+        "jlpm build:prod"
+      ],
+      "before-build-python": [
+        "jlpm clean"
       ],
       "before-bump-version": "python -m pip install bump2version"
     },

packages/lab-extension/package.json

@@ -35,8 +35,7 @@
     "build:labextension:dev": "jupyter labextension build --development True .",
     "build:lib": "tsc",
     "build:prod": "jlpm run build:lib && jlpm run build:labextension",
-    "clean": "jlpm run clean:lib",
-    "clean:all": "jlpm run clean:lib && jlpm run clean:labextension",
+    "clean": "jlpm run clean:lib && jlpm run clean:labextension",
     "clean:labextension": "rimraf ../../retrolab/labextension",
     "clean:lib": "rimraf lib tsconfig.tsbuildinfo",
     "watch": "run-p watch:src watch:labextension",