diff --git a/packages/image-io/typescript/src/index.ts b/packages/image-io/typescript/src/index.ts
index 0e982eb32..c560afd7f 100644
--- a/packages/image-io/typescript/src/index.ts
+++ b/packages/image-io/typescript/src/index.ts
@@ -487,6 +487,9 @@ export type { WasmZstdWriteImageOptions }
 import wasmZstdWriteImage from './wasm-zstd-write-image.js'
 export { wasmZstdWriteImage }
 
+import extensionToImageIo from './extension-to-image-io.js'
+export { extensionToImageIo }
+
 export type { BinaryFile } from 'itk-wasm'
 export type { JsonCompatible } from 'itk-wasm'
 export type { Image } from 'itk-wasm'