Deprecate redundant type checking guard utils

doc/whatsnew/fragments/8433.user_action

@@ -0,0 +1,10 @@
+The following utilities are deprecated in favor of the more robust ``in_type_checking_block``
+and will be removed in pylint 3.0:
+
+  - ``is_node_in_guarded_import_block``
+  - ``is_node_in_typing_guarded_import_block``
+  - ``is_typing_guard``
+
+``is_sys_guard`` is still available, which was part of ``is_node_in_guarded_import_block``.
+
+Refs #8433

pylint/checkers/imports.py

@@ -21,9 +21,9 @@
 from pylint.checkers import BaseChecker, DeprecatedMixin
 from pylint.checkers.utils import (
     get_import_name,
+    in_type_checking_block,
     is_from_fallback_block,
-    is_node_in_guarded_import_block,
-    is_typing_guard,
+    is_sys_guard,
     node_ignores_exception,
 )
 from pylint.exceptions import EmptyReportError
@@ -154,9 +154,11 @@ def _ignore_import_failure(
         if submodule in ignored_modules:
             return True
 
-    if is_node_in_guarded_import_block(node):
-        # Ignore import failure if part of guarded import block
-        # I.e. `sys.version_info` or `typing.TYPE_CHECKING`
+    # Ignore import failure if part of guarded import block
+    # I.e. `sys.version_info` or `typing.TYPE_CHECKING`
+    if in_type_checking_block(node):
+        return True
+    if isinstance(node.parent, nodes.If) and is_sys_guard(node.parent):
         return True
 
     return node_ignores_exception(node, ImportError)
@@ -578,7 +580,11 @@ def leave_module(self, node: nodes.Module) -> None:
                 current_package
                 and current_package != package
                 and package in met
-                and is_node_in_guarded_import_block(import_node) is False
+                and not in_type_checking_block(import_node)
+                and not (
+                    isinstance(import_node.parent, nodes.If)
+                    and is_sys_guard(import_node.parent)
+                )
             ):
                 self.add_message("ungrouped-imports", node=import_node, args=package)
             current_package = package
@@ -884,10 +890,6 @@ def _add_imported_module(self, node: ImportNode, importedmodname: str) -> None:
         except ImportError:
             pass
 
-        in_type_checking_block = isinstance(node.parent, nodes.If) and is_typing_guard(
-            node.parent
-        )
-
         if context_name == importedmodname:
             self.add_message("import-self", node=node)
 
@@ -906,10 +908,9 @@ def _add_imported_module(self, node: ImportNode, importedmodname: str) -> None:
 
             # update import graph
             self.import_graph[context_name].add(importedmodname)
-            if (
-                not self.linter.is_message_enabled("cyclic-import", line=node.lineno)
-                or in_type_checking_block
-            ):
+            if not self.linter.is_message_enabled(
+                "cyclic-import", line=node.lineno
+            ) or in_type_checking_block(node):
                 self._excluded_edges[context_name].add(importedmodname)
 
     def _check_preferred_module(self, node: ImportNode, mod_path: str) -> None:

pylint/checkers/utils.py

@@ -12,6 +12,7 @@
 import numbers
 import re
 import string
+import warnings
 from collections import deque
 from collections.abc import Iterable, Iterator
 from functools import lru_cache, partial
@@ -1798,13 +1799,23 @@ def is_typing_guard(node: nodes.If) -> bool:
     >>> if TYPE_CHECKING:
     >>>     from xyz import a
     """
+    warnings.warn(
+        "This method will be removed in pylint 3.0; use in_type_checking_block() instead.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
     return isinstance(
         node.test, (nodes.Name, nodes.Attribute)
     ) and node.test.as_string().endswith("TYPE_CHECKING")
 
 
 def is_node_in_typing_guarded_import_block(node: nodes.NodeNG) -> bool:
     """Return True if node is part for guarded `typing.TYPE_CHECKING` if block."""
+    warnings.warn(
+        "This method will be removed in pylint 3.0; use in_type_checking_block() instead.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
     return isinstance(node.parent, nodes.If) and is_typing_guard(node.parent)
 
 
@@ -1813,6 +1824,11 @@ def is_node_in_guarded_import_block(node: nodes.NodeNG) -> bool:
 
     I.e. `sys.version_info` or `typing.TYPE_CHECKING`
     """
+    warnings.warn(
+        "This method will be removed in pylint 3.0; use in_type_checking_block() instead.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
     return isinstance(node.parent, nodes.If) and (
         is_sys_guard(node.parent) or is_typing_guard(node.parent)
     )

pylint/checkers/variables.py

@@ -27,6 +27,7 @@
 from pylint.checkers.utils import (
     in_type_checking_block,
     is_postponed_evaluation_enabled,
+    is_sys_guard,
 )
 from pylint.constants import PY39_PLUS, TYPING_NEVER, TYPING_NORETURN
 from pylint.interfaces import CONTROL_FLOW, HIGH, INFERENCE, INFERENCE_FAILURE
@@ -1891,9 +1892,10 @@ def visit_import(self, node: nodes.Import) -> None:
             # No need to verify this, since ImportError is already
             # handled by the client code.
             return
-        if utils.is_node_in_guarded_import_block(node) is True:
-            # Don't verify import if part of guarded import block
-            # I.e. `sys.version_info` or `typing.TYPE_CHECKING`
+        # Don't verify import if part of guarded import block
+        if in_type_checking_block(node):
+            return
+        if isinstance(node.parent, nodes.If) and is_sys_guard(node.parent):
             return
 
         for name, _ in node.names:
@@ -1913,9 +1915,11 @@ def visit_importfrom(self, node: nodes.ImportFrom) -> None:
             # No need to verify this, since ImportError is already
             # handled by the client code.
             return
-        if utils.is_node_in_guarded_import_block(node) is True:
-            # Don't verify import if part of guarded import block
-            # I.e. `sys.version_info` or `typing.TYPE_CHECKING`
+        # Don't verify import if part of guarded import block
+        # I.e. `sys.version_info` or `typing.TYPE_CHECKING`
+        if in_type_checking_block(node):
+            return
+        if isinstance(node.parent, nodes.If) and is_sys_guard(node.parent):
             return
 
         name_parts = node.modname.split(".")

pylint/extensions/private_import.py

@@ -39,7 +39,7 @@ def __init__(self, linter: PyLinter) -> None:
 
     @utils.only_required_for_messages("import-private-name")
     def visit_import(self, node: nodes.Import) -> None:
-        if utils.is_node_in_typing_guarded_import_block(node):
+        if utils.in_type_checking_block(node):
             return
         names = [name[0] for name in node.names]
         private_names = self._get_private_imports(names)
@@ -56,7 +56,7 @@ def visit_import(self, node: nodes.Import) -> None:
 
     @utils.only_required_for_messages("import-private-name")
     def visit_importfrom(self, node: nodes.ImportFrom) -> None:
-        if utils.is_node_in_typing_guarded_import_block(node):
+        if utils.in_type_checking_block(node):
             return
         # Only check imported names if the module is external
         if self.same_root_dir(node, node.modname):

tests/checkers/unittest_utils.py

@@ -413,6 +413,7 @@ def test_if_sys_guard() -> None:
     assert utils.is_sys_guard(code[2]) is False
 
 
+@pytest.mark.filterwarnings("ignore::DeprecationWarning")
 def test_if_typing_guard() -> None:
     code = astroid.extract_node(
         """