diff --git a/packages/image-io/typescript/package.json b/packages/image-io/typescript/package.json
index c2db2a557..f05fd6a6d 100644
--- a/packages/image-io/typescript/package.json
+++ b/packages/image-io/typescript/package.json
@@ -47,6 +47,7 @@
   },
   "devDependencies": {
     "@shoelace-style/shoelace": "^2.5.2",
+    "@types/mime-types": "^2.1.4",
     "@types/node": "^20.2.5",
     "ava": "^5.3.1",
     "concurrently": "^8.2.1",
diff --git a/packages/image-io/typescript/pnpm-lock.yaml b/packages/image-io/typescript/pnpm-lock.yaml
index ab5018a29..372d8b5f0 100644
--- a/packages/image-io/typescript/pnpm-lock.yaml
+++ b/packages/image-io/typescript/pnpm-lock.yaml
@@ -13,6 +13,9 @@ devDependencies:
   '@shoelace-style/shoelace':
     specifier: ^2.5.2
     version: 2.11.2(@types/react@18.2.34)
+  '@types/mime-types':
+    specifier: ^2.1.4
+    version: 2.1.4
   '@types/node':
     specifier: ^20.2.5
     version: 20.8.10
@@ -605,6 +608,10 @@ packages:
     resolution: {integrity: sha512-ILdWj4XYtNOqxJaW22NEQx2gJsLfV5ncxYhhGX1a1H1lXl2Ta0gUz7QOnOoF1xQbJwWDjImi8gXN9mKdIf6n9g==}
     dev: false
 
+  /@types/mime-types@2.1.4:
+    resolution: {integrity: sha512-lfU4b34HOri+kAY5UheuFMWPDOI+OPceBSHZKp69gEyTL/mmJ4cnU6Y/rlme3UL3GyOn6Y42hyIEw0/q8sWx5w==}
+    dev: true
+
   /@types/node@18.18.8:
     resolution: {integrity: sha512-OLGBaaK5V3VRBS1bAkMVP2/W9B+H8meUfl866OrMNQqt7wDgdpWPp5o6gmIc9pB+lIQHSq4ZL8ypeH1vPxcPaQ==}
     dependencies: