diff --git a/types/type-is/index.d.ts b/types/type-is/index.d.ts
index 93c70aa4a3..9fffd0bb9a 100644
--- a/types/type-is/index.d.ts
+++ b/types/type-is/index.d.ts
@@ -13,7 +13,9 @@ declare function typeIs(request: IncomingMessage, types: string[]): string | fal
 declare function typeIs(request: IncomingMessage, ...types: string[]): string | false | null;
 
 declare namespace typeIs {
+    function normalize(type: string): string | false;
     function hasBody(request: IncomingMessage): boolean;
     function is(mediaType: string, types: string[]): string | false;
     function is(mediaType: string, ...types: string[]): string | false;
+    function mimeMatch(expected: false | string, actual: string): boolean;
 }