Add proper import in doc examples

4 files changed, 36 insertions, 2 deletions

diff --git a/doc/how_tos/custom_checkers.rst b/doc/how_tos/custom_checkers.rst
index 36fcc07a3..30c70d63a 100644
--- a/doc/how_tos/custom_checkers.rst
+++ b/doc/how_tos/custom_checkers.rst
@@ -201,6 +201,14 @@ Add the ``register`` function to the top level of the file.
 
 .. code-block:: python
 
+  from typing import TYPE_CHECKING
+
+  import astroid
+
+  if TYPE_CHECKING:
+      from pylint.lint import PyLinter
+
+
   def register(linter: "PyLinter") -> None:
       """This required method auto registers the checker during initialization.
 
diff --git a/doc/how_tos/plugins.rst b/doc/how_tos/plugins.rst
index 5fa094c29..bc2c0f14c 100644
--- a/doc/how_tos/plugins.rst
+++ b/doc/how_tos/plugins.rst
@@ -25,6 +25,14 @@ So a basic hello-world plugin can be implemented as:
 .. sourcecode:: python
 
   # Inside hello_plugin.py
+  from typing import TYPE_CHECKING
+
+  import astroid
+
+  if TYPE_CHECKING:
+      from pylint.lint import PyLinter
+
+
   def register(linter: "PyLinter") -> None:
     """This required method auto registers the checker during initialization.
 
@@ -47,6 +55,14 @@ We can extend hello-world plugin to ignore some specific names using
 .. sourcecode:: python
 
   # Inside hello_plugin.py
+  from typing import TYPE_CHECKING
+
+  import astroid
+
+  if TYPE_CHECKING:
+      from pylint.lint import PyLinter
+
+
   def register(linter: "PyLinter") -> None:
     """This required method auto registers the checker during initialization.
 
diff --git a/doc/how_tos/transform_plugins.rst b/doc/how_tos/transform_plugins.rst
index 4980051a6..031faa0f1 100644
--- a/doc/how_tos/transform_plugins.rst
+++ b/doc/how_tos/transform_plugins.rst
@@ -66,8 +66,14 @@ Module, Class, Function etc. In our case we need to transform a class. It can be
 
 .. sourcecode:: python
 
+  from typing import TYPE_CHECKING
+
   import astroid
 
+  if TYPE_CHECKING:
+      from pylint.lint import PyLinter
+
+
   def register(linter: "PyLinter") -> None:
     """This required method auto registers the checker during initialization.
 
diff --git a/pylint/checkers/ellipsis_checker.py b/pylint/checkers/ellipsis_checker.py
index 6ef9299a3..ab1c14be4 100644
--- a/pylint/checkers/ellipsis_checker.py
+++ b/pylint/checkers/ellipsis_checker.py
@@ -1,11 +1,15 @@
 """Ellipsis checker for Python code
 """
+from typing import TYPE_CHECKING
+
 from astroid import nodes
 
 from pylint.checkers import BaseChecker
 from pylint.checkers.utils import check_messages
 from pylint.interfaces import IAstroidChecker
-from pylint.lint import PyLinter
+
+if TYPE_CHECKING:
+    from pylint.lint import PyLinter
 
 
 class EllipsisChecker(BaseChecker):
@@ -45,7 +49,7 @@ class EllipsisChecker(BaseChecker):
             self.add_message("unnecessary-ellipsis", node=node)
 
 
-def register(linter: PyLinter) -> None:
+def register(linter: "PyLinter") -> None:
     """This required method auto registers the checker during initialization.
 
     :param linter: The linter to register the checker to.