diff --git a/file/src/file.ts b/file/src/file.ts
index c8b401e..1ddc486 100644
--- a/file/src/file.ts
+++ b/file/src/file.ts
@@ -83,7 +83,9 @@ export class CoolFile {
           region,
           credentials: { accessKeyId, secretAccessKey },
           // 支持自定义s3服务，如minio等
-          endpoint: publicDomain ? publicDomain : `https://s3.${region}.amazonaws.com`,
+          endpoint: publicDomain
+            ? publicDomain
+            : `https://s3.${region}.amazonaws.com`,
         });
       }
     }