Add dependency on component stub packages

.circleci/config.yml

@@ -494,7 +494,6 @@ jobs:
                   pip install -r dev-requirements.txt --quiet
                   pip install -r python-requirements.txt --quiet
                   pip install dash-package/dash-package.tar.gz[dev,testing]
-                  pip uninstall -y dash-html-components dash-core-components
           - run:
               name: Build
               command: |

dash/development/base_component.py

@@ -78,6 +78,8 @@ def __str__(self):
     REQUIRED = _REQUIRED()
 
     def __init__(self, **kwargs):
+        import dash  # pylint: disable=import-outside-toplevel, cyclic-import
+
         # pylint: disable=super-init-not-called
         for k, v in list(kwargs.items()):
             # pylint: disable=no-member
@@ -88,12 +90,33 @@ def __init__(self, **kwargs):
             # e.g. "The dash_core_components.Dropdown component (version 1.6.0)
             # with the ID "my-dropdown"
             try:
-                error_string_prefix = "The `{}.{}` component (version {}){}".format(
-                    self._namespace,
-                    self._type,
-                    getattr(__import__(self._namespace), "__version__", "unknown"),
-                    ' with the ID "{}"'.format(kwargs["id"]) if "id" in kwargs else "",
-                )
+                # Get fancy error strings that have the version numbers
+                error_string_prefix = "The `{}.{}` component (version {}){}"
+                # These components are part of dash now, so extract the dash version:
+                dash_packages = {
+                    "dash_html_components": "html",
+                    "dash_core_components": "dcc",
+                    "dash_table": "dash_table",
+                }
+                if self._namespace in dash_packages:
+                    error_string_prefix = error_string_prefix.format(
+                        dash_packages[self._namespace],
+                        self._type,
+                        dash.__version__,
+                        ' with the ID "{}"'.format(kwargs["id"])
+                        if "id" in kwargs
+                        else "",
+                    )
+                else:
+                    # Otherwise import the package and extract the version number
+                    error_string_prefix = error_string_prefix.format(
+                        self._namespace,
+                        self._type,
+                        getattr(__import__(self._namespace), "__version__", "unknown"),
+                        ' with the ID "{}"'.format(kwargs["id"])
+                        if "id" in kwargs
+                        else "",
+                    )
             except ImportError:
                 # Our tests create mock components with libraries that
                 # aren't importable

requires-install.txt

@@ -1,3 +1,6 @@
 Flask>=1.0.4
 flask-compress
 plotly>=5.0.0
+dash_html_components==2.0.0
+dash_core_components==2.0.0
+dash_table==5.0.0

tests/unit/development/test_base_component.py

@@ -3,6 +3,7 @@
 import plotly
 import pytest
 
+from dash import __version__
 from dash import html
 from dash.development.base_component import Component
 
@@ -458,7 +459,7 @@ def test_debc027_component_error_message():
     with pytest.raises(TypeError) as e:
         html.Div(asdf=True)
     assert str(e.value) == (
-        "The `Div` component "
+        "The `html.Div` component (version {}) ".format(__version__)
         + "received an unexpected "
         + "keyword argument: `asdf`\n"
         + "Allowed arguments: {}".format(", ".join(sorted(html.Div()._prop_names)))
@@ -467,7 +468,7 @@ def test_debc027_component_error_message():
     with pytest.raises(TypeError) as e:
         html.Div(asdf=True, id="my-component")
     assert str(e.value) == (
-        "The `Div` component "
+        "The `html.Div` component (version {}) ".format(__version__)
         + 'with the ID "my-component" received an unexpected '
         + "keyword argument: `asdf`\n"
         + "Allowed arguments: {}".format(", ".join(sorted(html.Div()._prop_names)))