Merge pull request #603 from plotly/hot-reload-dist

Add component packages dist to hot reload watch.

CHANGELOG.md

@@ -4,6 +4,9 @@
 - Fix missing component prop docstring error [#598](https://github.com/plotly/dash/issues/598)
 - Moved `__repr__` to base component instead of being generated. [#492](https://github.com/plotly/dash/pull/492)
 
+## Added
+- Added components libraries js/css distribution to hot reload watch. [#603](https://github.com/plotly/dash/pull/603)
+
 ## [0.37.0] - 2019-02-11
 ## Fixed
 - Fixed collections.abc deprecation warning for python 3.8 [#563](https://github.com/plotly/dash/pull/563)

dash/dash.py

@@ -24,7 +24,7 @@
 
 from .dependencies import Input, Output, State
 from .resources import Scripts, Css
-from .development.base_component import Component
+from .development.base_component import Component, ComponentRegistry
 from . import exceptions
 from ._utils import AttributeDict as _AttributeDict
 from ._utils import interpolate_str as _interpolate
@@ -1155,9 +1155,20 @@ def enable_dev_tools(self,
 
         if self._dev_tools.hot_reload:
             self._reload_hash = _generate_hash()
+
+            component_packages_dist = [
+                os.path.dirname(package.path)
+                if hasattr(package, 'path')
+                else package.filename
+                for package in (
+                    pkgutil.find_loader(x) for x in
+                    list(ComponentRegistry.registry) + ['dash_renderer']
+                )
+            ]
+
             self._watch_thread = threading.Thread(
                 target=lambda: _watch.watch(
-                    [self._assets_folder],
+                    [self._assets_folder] + component_packages_dist,
                     self._on_assets_change,
                     sleep_time=self._dev_tools.hot_reload_watch_interval)
             )