diff --git a/src/types/HttpServerLike.ts b/src/types/HttpServerLike.ts
new file mode 100644
index 0000000..779bcbc
--- /dev/null
+++ b/src/types/HttpServerLike.ts
@@ -0,0 +1,4 @@
+import http from 'node:http'
+import https from 'node:https'
+
+export type HttpServerLike = http.Server | https.Server
diff --git a/src/types/UnknownFunction.ts b/src/types/UnknownFunction.ts
new file mode 100644
index 0000000..6425f4b
--- /dev/null
+++ b/src/types/UnknownFunction.ts
@@ -0,0 +1 @@
+export type UnknownFunction = (...args: unknown[]) => unknown