diff --git a/src/download.ts b/src/download.ts
index 82022da..9355cd3 100644
--- a/src/download.ts
+++ b/src/download.ts
@@ -1,22 +1,11 @@
 import path from 'path';
 import fsp from 'fs/promises';
-import { HttpClient } from 'isomorphic-git/http/node';
 
 import { bodyToBuffer, isWriteable } from './util';
 import { Pointer } from './pointers';
+import { HTTPRequest } from './types';
 
 
-interface DownloadBlobRequest {
-  http: HttpClient;
-  headers?: Record<string, any>;
-
-  /** Repository URL. */
-  url: string;
-
-  /** Auth data for basic HTTP auth. */
-  auth?: { username: string, password: string }
-}
-
 interface LFSInfoResponse {
   objects: {
     actions: {
@@ -37,7 +26,7 @@ function isValidLFSInfoResponseData(val: Record<string, any>): val is LFSInfoRes
  * Downloads, caches and returns a blob corresponding to given LFS pointer.
  */
 export default async function downloadBlobFromPointer(
-  { http: { request }, headers = {}, url, auth }: DownloadBlobRequest,
+  { http: { request }, headers = {}, url, auth }: HTTPRequest,
   { info, objectPath }: Pointer,
 ): Promise<Buffer> {
 
diff --git a/src/types.ts b/src/types.ts
new file mode 100644
index 0000000..5093c06
--- /dev/null
+++ b/src/types.ts
@@ -0,0 +1,23 @@
+import { HttpClient, ProgressCallback } from 'isomorphic-git/http/node';
+
+
+export interface BasicAuth {
+  username: string
+  password: string
+}
+
+
+// TODO: Restructure HTTPRequest to reuse Isomorphic Git’s GitHttpRequest?
+
+export interface HTTPRequest {
+  http: HttpClient;
+  headers?: Record<string, any>;
+
+  /** Repository URL. */
+  url: string;
+
+  /** Auth data for basic HTTP auth. */
+  auth?: BasicAuth
+
+  onProgress?: ProgressCallback
+}