Merge pull request #85 from plotly/orjson-hack

preemptively import orjson

Author: alexcjohnson

CHANGELOG.md

@@ -5,6 +5,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ## Unreleased
 ### Fixed
   - Fixed `werkzeug` 2.1.0 import and `skip` calculation, shutdown deprecation warning.
+  - Work around a partial import of `orjson` when it's installed and you use `mode="jupyterlab"`
 
 ## 0.4.1 - 2022-02-16
 ### Fixed

jupyter_dash/jupyter_app.py

@@ -287,6 +287,14 @@ def run_server(
             inline_exceptions=inline_exceptions,
         )
 
+        # prevent partial import of orjson when it's installed and mode=jupyterlab
+        # TODO: why do we need this? Why only in this mode? Importing here in
+        # all modes anyway, in case there's a way it can pop up in another mode
+        try:
+            import orjson
+        except ImportError:
+            pass
+
         @retry(
             stop_max_attempt_number=15,
             wait_exponential_multiplier=100,