diff --git a/flask_htmx/constants.py b/flask_htmx/constants.py
index 4938f99..2a26562 100644
--- a/flask_htmx/constants.py
+++ b/flask_htmx/constants.py
@@ -1,3 +1,6 @@
+import typing
+
+
 #: True and False values for the HX-* request and response headers
 HX_TRUE = "true"
 HX_FALSE = "false"
@@ -14,6 +17,17 @@
     "none",
 ]
 
+ReSwapType = typing.Literal[
+    "innerHTML",
+    "outerHTML",
+    "beforebegin",
+    "afterbegin",
+    "beforeend",
+    "afterend",
+    "delete",
+    "none",
+]
+
 #: If you want to stop polling from a server response you can respond with the HTTP
 #: response code 286 and the element will cancel the polling.
 HTMX_STOP_POLLING = 286
diff --git a/flask_htmx/htmx.py b/flask_htmx/htmx.py
index 882e9b1..1972479 100644
--- a/flask_htmx/htmx.py
+++ b/flask_htmx/htmx.py
@@ -16,7 +16,7 @@ class HTMX:
     - https://github.com/adamchainz/django-htmx
     """
 
-    def __init__(self, app: Flask = None):
+    def __init__(self, app: Optional[Flask] = None):
         self.app = app
         if app is not None:
             self.init_app(app)
diff --git a/flask_htmx/responses.py b/flask_htmx/responses.py
index 1664380..0f5d7de 100644
--- a/flask_htmx/responses.py
+++ b/flask_htmx/responses.py
@@ -6,7 +6,13 @@
 from flask import Response
 from flask import make_response as flask_make_response
 
-from flask_htmx.constants import HTMX_STOP_POLLING, HX_FALSE, HX_TRUE, RESWAPS
+from flask_htmx.constants import (
+    HTMX_STOP_POLLING,
+    HX_FALSE,
+    HX_TRUE,
+    RESWAPS,
+    ReSwapType,
+)
 
 
 class HTMXResponseClientRedirect(Response):
@@ -41,16 +47,16 @@ def _stringify(val):
 
 def make_response(
     *args: typing.Any,
-    location: str | dict | None = None,
-    push_url: str | False | None = None,
+    location: str | typing.Dict[str, str] | None = None,
+    push_url: str | typing.Literal[False] | None = None,
     redirect: str | None = None,
     refresh: bool = False,
-    replace_url: str | False | None = None,
-    reswap: str | None = None,
+    replace_url: str | typing.Literal[False] | None = None,
+    reswap: ReSwapType | None = None,
     retarget: str | None = None,
-    trigger: str | dict | None = None,
-    trigger_after_settle: str | dict | None = None,
-    trigger_after_swap: str | dict | None = None,
+    trigger: str | typing.Dict[str, str] | None = None,
+    trigger_after_settle: str | typing.Dict[str, str] | None = None,
+    trigger_after_swap: str | typing.Dict[str, str] | None = None,
 ) -> Response:
     """
     This function can be used as a replacement from :code:`flask.make_response` to