Merge pull request plotly#2105 from pikhovkin/pikhovkin-patch-1

Fix dependencies between Dash components

Author: T4rk1n

CHANGELOG.md

@@ -28,6 +28,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - [#2257](https://github.com/plotly/dash/pull/2257) Fix tuple types in the TypeScript component generator.
 - [#2293](https://github.com/plotly/dash/pull/2293) Fix Dropdown useMemo not detecting equal objects
 - [#2277](https://github.com/plotly/dash/pull/2277) Use dropdown styles from node_modules, instead of from stored css file
+- [#2105](https://github.com/plotly/dash/pull/2105) Fix order of dash component libraries imports.
 
 ### Changed
 

dash/_utils.py

@@ -219,6 +219,30 @@ def gen_salt(chars):
     )
 
 
+class OrderedSet(collections.abc.MutableSet):
+    def __init__(self, *args):
+        self._data = []
+        for i in args:
+            self.add(i)
+
+    def add(self, value):
+        if value not in self._data:
+            self._data.append(value)
+
+    def discard(self, value):
+        self._data.remove(value)
+
+    def __contains__(self, x):
+        return x in self._data
+
+    def __len__(self):
+        return len(self._data)
+
+    def __iter__(self):
+        for i in self._data:
+            yield i
+
+
 def coerce_to_list(obj):
     if not isinstance(obj, (list, tuple)):
         return [obj]

dash/development/base_component.py

@@ -5,7 +5,7 @@
 import uuid
 import random
 
-from .._utils import patch_collections_abc, stringify_id
+from .._utils import patch_collections_abc, stringify_id, OrderedSet
 
 MutableSequence = patch_collections_abc("MutableSequence")
 
@@ -16,7 +16,7 @@
 class ComponentRegistry:
     """Holds a registry of the namespaces used by components."""
 
-    registry = set()
+    registry = OrderedSet()
     children_props = collections.defaultdict(dict)
 
     @classmethod