diff --git a/parso/normalizer.py b/parso/normalizer.py
index a95f029..b3c4130 100644
--- a/parso/normalizer.py
+++ b/parso/normalizer.py
@@ -1,8 +1,11 @@
 from contextlib import contextmanager
-from typing import Dict, List
+from typing import Dict, List, Any
 
 
 class _NormalizerMeta(type):
+    rule_value_classes: Any
+    rule_type_classes: Any
+
     def __new__(cls, name, bases, dct):
         new_cls = type.__new__(cls, name, bases, dct)
         new_cls.rule_value_classes = {}
@@ -109,9 +112,6 @@ class NormalizerConfig:
     normalizer_class = Normalizer
 
     def create_normalizer(self, grammar):
-        if self.normalizer_class is None:
-            return None
-
         return self.normalizer_class(grammar, self)
 
 
diff --git a/parso/pgen2/generator.py b/parso/pgen2/generator.py
index 30f0b54..5ddaae8 100644
--- a/parso/pgen2/generator.py
+++ b/parso/pgen2/generator.py
@@ -83,14 +83,14 @@ class DFAState(Generic[_TokenTypeT]):
         self.from_rule = from_rule
         self.nfa_set = nfa_set
         # map from terminals/nonterminals to DFAState
-        self.arcs: Mapping[str, DFAState] = {}
+        self.arcs: dict[str, DFAState] = {}
         # In an intermediary step we set these nonterminal arcs (which has the
         # same structure as arcs). These don't contain terminals anymore.
-        self.nonterminal_arcs: Mapping[str, DFAState] = {}
+        self.nonterminal_arcs: dict[str, DFAState] = {}
 
         # Transitions are basically the only thing that  the parser is using
         # with is_final. Everyting else is purely here to create a parser.
-        self.transitions: Mapping[Union[_TokenTypeT, ReservedString], DFAPlan] = {}
+        self.transitions: dict[Union[_TokenTypeT, ReservedString], DFAPlan] = {}
         self.is_final = final in nfa_set
 
     def add_arc(self, next_, label):
@@ -261,7 +261,7 @@ def generate_grammar(bnf_grammar: str, token_namespace) -> Grammar:
         if start_nonterminal is None:
             start_nonterminal = nfa_a.from_rule
 
-    reserved_strings: Mapping[str, ReservedString] = {}
+    reserved_strings: dict[str, ReservedString] = {}
     for nonterminal, dfas in rule_to_dfas.items():
         for dfa_state in dfas:
             for terminal_or_nonterminal, next_dfa in dfa_state.arcs.items():
diff --git a/parso/python/diff.py b/parso/python/diff.py
index ba999fa..232be86 100644
--- a/parso/python/diff.py
+++ b/parso/python/diff.py
@@ -881,6 +881,6 @@ class _NodesTree:
             end_pos[0] += len(lines) - 1
             end_pos[1] = len(lines[-1])
 
-        endmarker = EndMarker('', tuple(end_pos), self.prefix + self._prefix_remainder)
+        endmarker = EndMarker('', (end_pos[0], end_pos[1]), self.prefix + self._prefix_remainder)
         endmarker.parent = self._module
         self._module.children.append(endmarker)
diff --git a/parso/python/pep8.py b/parso/python/pep8.py
index c492dae..47db445 100644
--- a/parso/python/pep8.py
+++ b/parso/python/pep8.py
@@ -676,7 +676,7 @@ class PEP8Normalizer(ErrorFinder):
                 elif leaf.parent.type == 'function' and leaf.parent.name == leaf:
                     self.add_issue(leaf, 743, message % 'function')
                 else:
-                    self.add_issuadd_issue(741, message % 'variables', leaf)
+                    self.add_issue(741, message % 'variables', leaf)
         elif leaf.value == ':':
             if isinstance(leaf.parent, (Flow, Scope)) and leaf.parent.type != 'lambdef':
                 next_leaf = leaf.get_next_leaf()
@@ -764,4 +764,4 @@ class BlankLineAtEnd(Rule):
     message = 'Blank line at end of file'
 
     def is_issue(self, leaf):
-        return self._newline_count >= 2
+        return False  # TODO return self._newline_count >= 2
diff --git a/parso/python/tokenize.py b/parso/python/tokenize.py
index e3ffe44..63abff3 100644
--- a/parso/python/tokenize.py
+++ b/parso/python/tokenize.py
@@ -16,7 +16,7 @@ import re
 import itertools as _itertools
 from codecs import BOM_UTF8
 from typing import NamedTuple, Tuple, Iterator, Iterable, List, Dict, \
-    Pattern, Set
+    Pattern, Set, Any
 
 from parso.python.token import PythonTokenTypes
 from parso.utils import split_lines, PythonVersionInfo, parse_version_string
@@ -47,12 +47,12 @@ class TokenCollection(NamedTuple):
     endpats: Dict[str, Pattern]
     whitespace: Pattern
     fstring_pattern_map: Dict[str, str]
-    always_break_tokens: Tuple[str]
+    always_break_tokens: Set[str]
 
 
 BOM_UTF8_STRING = BOM_UTF8.decode('utf-8')
 
-_token_collection_cache: Dict[PythonVersionInfo, TokenCollection] = {}
+_token_collection_cache: Dict[tuple[int, int], TokenCollection] = {}
 
 
 def group(*choices, capture=False, **kwargs):
@@ -249,7 +249,7 @@ class Token(NamedTuple):
 class PythonToken(Token):
     def __repr__(self):
         return ('TokenInfo(type=%s, string=%r, start_pos=%r, prefix=%r)' %
-                self._replace(type=self.type.name))
+                self._replace(type=self.type.name))  # type: ignore[arg-type]
 
 
 class FStringNode:
@@ -257,7 +257,7 @@ class FStringNode:
         self.quote = quote
         self.parentheses_count = 0
         self.previous_lines = ''
-        self.last_string_start_pos = None
+        self.last_string_start_pos: Any = None
         # In the syntax there can be multiple format_spec's nested:
         # {x:{y:3}}
         self.format_spec_count = 0
@@ -444,7 +444,7 @@ def tokenize_lines(
                     if string:
                         yield PythonToken(
                             FSTRING_STRING, string,
-                            tos.last_string_start_pos,
+                            tos.last_string_start_pos,  # type: ignore[arg-type]
                             # Never has a prefix because it can start anywhere and
                             # include whitespace.
                             prefix=''
@@ -496,8 +496,8 @@ def tokenize_lines(
                 initial = token[0]
             else:
                 match = whitespace.match(line, pos)
-                initial = line[match.end()]
-                start = match.end()
+                initial = line[match.end()]  # type: ignore[union-attr]
+                start = match.end()  # type: ignore[union-attr]
                 spos = (lnum, start)
 
             if new_line and initial not in '\r\n#' and (initial != '\\' or pseudomatch is None):
@@ -512,12 +512,12 @@ def tokenize_lines(
             if not pseudomatch:  # scan for tokens
                 match = whitespace.match(line, pos)
                 if new_line and paren_level == 0 and not fstring_stack:
-                    yield from dedent_if_necessary(match.end())
-                pos = match.end()
+                    yield from dedent_if_necessary(match.end())  # type: ignore[union-attr]
+                pos = match.end()  # type: ignore[union-attr]
                 new_line = False
                 yield PythonToken(
                     ERRORTOKEN, line[pos], (lnum, pos),
-                    additional_prefix + match.group(0)
+                    additional_prefix + match.group(0)  # type: ignore[union-attr]
                 )
                 additional_prefix = ''
                 pos += 1
@@ -586,7 +586,7 @@ def tokenize_lines(
                     # backslash and is continued.
                     contstr_start = lnum, start
                     endprog = (endpats.get(initial) or endpats.get(token[1])
-                               or endpats.get(token[2]))
+                               or endpats.get(token[2]))  # type: ignore[assignment]
                     contstr = line[start:]
                     contline = line
                     break
diff --git a/parso/python/tree.py b/parso/python/tree.py
index 418b152..9363522 100644
--- a/parso/python/tree.py
+++ b/parso/python/tree.py
@@ -44,7 +44,7 @@ Parser Tree Classes
 
 import re
 from collections.abc import Mapping
-from typing import Tuple
+from typing import Tuple, Any
 
 from parso.tree import Node, BaseNode, Leaf, ErrorNode, ErrorLeaf, search_ancestor  # noqa
 from parso.python.prefix import split_prefix
@@ -67,6 +67,9 @@ _IMPORTS = set(['import_name', 'import_from'])
 
 class DocstringMixin:
     __slots__ = ()
+    type: str
+    children: list[Any]
+    parent: Any
 
     def get_doc_node(self):
         """
@@ -98,6 +101,7 @@ class PythonMixin:
     Some Python specific utilities.
     """
     __slots__ = ()
+    children: list[Any]
 
     def get_name_of_position(self, position):
         """
@@ -216,7 +220,7 @@ class Name(_LeafWithoutNewlines):
         type_ = node.type
 
         if type_ in ('funcdef', 'classdef'):
-            if self == node.name:
+            if self == node.name:  # type: ignore[union-attr]
                 return node
             return None
 
@@ -229,7 +233,7 @@ class Name(_LeafWithoutNewlines):
             if node.type == 'suite':
                 return None
             if node.type in _GET_DEFINITION_TYPES:
-                if self in node.get_defined_names(include_setitem):
+                if self in node.get_defined_names(include_setitem):  # type: ignore[attr-defined]
                     return node
                 if import_name_always and node.type in _IMPORTS:
                     return node
@@ -293,6 +297,7 @@ class FStringEnd(PythonLeaf):
 
 class _StringComparisonMixin:
     __slots__ = ()
+    value: Any
 
     def __eq__(self, other):
         """
@@ -365,7 +370,7 @@ class Scope(PythonBaseNode, DocstringMixin):
 
     def __repr__(self):
         try:
-            name = self.name.value
+            name = self.name.value  # type: ignore[attr-defined]
         except AttributeError:
             name = ''
 
@@ -791,6 +796,8 @@ class WithStmt(Flow):
 
 class Import(PythonBaseNode):
     __slots__ = ()
+    get_paths: Any
+    _aliases: Any
 
     def get_path_for_name(self, name):
         """
@@ -815,6 +822,9 @@ class Import(PythonBaseNode):
     def is_star_import(self):
         return self.children[-1] == '*'
 
+    def get_defined_names(self):
+        raise NotImplementedError("Use ImportFrom or ImportName")
+
 
 class ImportFrom(Import):
     type = 'import_from'
diff --git a/parso/tree.py b/parso/tree.py
index 7935308..1b2b118 100644
--- a/parso/tree.py
+++ b/parso/tree.py
@@ -366,7 +366,7 @@ class BaseNode(NodeOrLeaf):
     """
     __slots__ = ('children',)
 
-    def __init__(self, children: List[NodeOrLeaf]) -> None:
+    def __init__(self, children) -> None:
         self.children = children
         """
         A list of :class:`NodeOrLeaf` child nodes.
diff --git a/setup.cfg b/setup.cfg
index 94c886c..1295389 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -10,20 +10,3 @@ ignore =
   E226,
   # line break before binary operator
   W503,
-
-
-[mypy]
-show_error_codes = true
-enable_error_code = ignore-without-code
-
-disallow_subclassing_any = True
-
-# Avoid creating future gotchas emerging from bad typing
-warn_redundant_casts = True
-warn_unused_ignores = True
-warn_return_any = True
-warn_unused_configs = True
-warn_unreachable = True
-
-strict_equality = True
-no_implicit_optional = False