[core] Add typing to some core files (#10843)

esphome/cpp_generator.py

@@ -1,5 +1,5 @@
 import abc
-from collections.abc import Callable, Sequence
+from collections.abc import Callable
 import inspect
 import math
 import re
@@ -13,7 +13,6 @@ from esphome.core import (
     HexInt,
     Lambda,
     Library,
-    TimePeriod,
     TimePeriodMicroseconds,
     TimePeriodMilliseconds,
     TimePeriodMinutes,
@@ -21,35 +20,11 @@ from esphome.core import (
     TimePeriodSeconds,
 )
 from esphome.helpers import cpp_string_escape, indent_all_but_first_and_last
+from esphome.types import Expression, SafeExpType, TemplateArgsType
 from esphome.util import OrderedDict
 from esphome.yaml_util import ESPHomeDataBase
 
 
-class Expression(abc.ABC):
-    __slots__ = ()
-
-    @abc.abstractmethod
-    def __str__(self):
-        """
-        Convert expression into C++ code
-        """
-
-
-SafeExpType = (
-    Expression
-    | bool
-    | str
-    | str
-    | int
-    | float
-    | TimePeriod
-    | type[bool]
-    | type[int]
-    | type[float]
-    | Sequence[Any]
-)
-
-
 class RawExpression(Expression):
     __slots__ = ("text",)
 
@@ -575,7 +550,7 @@ def Pvariable(id_: ID, rhs: SafeExpType, type_: "MockObj" = None) -> "MockObj":
     return obj
 
 
-def new_Pvariable(id_: ID, *args: SafeExpType) -> Pvariable:
+def new_Pvariable(id_: ID, *args: SafeExpType) -> "MockObj":
     """Declare a new pointer variable in the code generation by calling it's constructor
     with the given arguments.
 
@@ -681,7 +656,7 @@ async def get_variable_with_full_id(id_: ID) -> tuple[ID, "MockObj"]:
 
 async def process_lambda(
     value: Lambda,
-    parameters: list[tuple[SafeExpType, str]],
+    parameters: TemplateArgsType,
     capture: str = "=",
     return_type: SafeExpType = None,
 ) -> LambdaExpression | None: