print more debug info for jupyter labextension build

Author: emilykl

js/package.json

@@ -12,7 +12,7 @@
   "scripts": {
     "build:widget": "esbuild --bundle --alias:plotly.js=plotly.js/dist/plotly --format=esm --minify --outfile=../plotly/package_data/widgetbundle.js src/widget.ts",
     "build:mimerenderer": "esbuild --bundle --alias:plotly.js=plotly.js/dist/plotly --format=esm --minify --outfile=lib/mimeExtension.js src/mimeExtension.ts",
-    "build:labextension": "jupyter labextension build .",
+    "build:labextension": "jupyter labextension build --debug --show-config-json .",
     "build": "npm run build:widget && npm run build:mimerenderer && npm run build:labextension",
     "watch": "npm run build -- --watch --sourcemap=inline",
     "typecheck": "tsc --noEmit"

plotly/labextension/package.json

@@ -30,6 +30,7 @@
   },
   "jupyterlab": {
     "mimeExtension": true,
+    "webpackConfig": "./webpack.config.js",
     "outputDir": "../plotly/labextension",
     "_build": {
       "load": "static/remoteEntry.6213e23b3bdd99ae0b34.js",