diff --git a/index.d.ts b/index.d.ts
index ae92dfb..276d86a 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -33,6 +33,10 @@ export interface File {
     type: 'add' | 'delete' | 'modify' | 'rename' | 'copy';
 }
 
-export default {
+declare type GitdiffParser = {
     parse(source: string): File[];
-};
+}
+
+declare const gitdiffParser: GitdiffParser;
+
+export default gitdiffParser;
\ No newline at end of file