1 files changed, 7 insertions, 2 deletions
diff --git a/crates/shirabe/src/downloader/dvcs_downloader_interface.rs b/crates/shirabe/src/downloader/dvcs_downloader_interface.rs
index 4c8ebd3..59f5774 100644
--- a/crates/shirabe/src/downloader/dvcs_downloader_interface.rs
+++ b/crates/shirabe/src/downloader/dvcs_downloader_interface.rs
@@ -1,8 +1,13 @@
 //! ref: composer/src/Composer/Downloader/DvcsDownloaderInterface.php
 
+use anyhow::Result;
+
 use crate::package::PackageInterfaceHandle;
 
 pub trait DvcsDownloaderInterface {
-    fn get_unpushed_changes(&self, package: PackageInterfaceHandle, path: String)
-    -> Option<String>;
+    fn get_unpushed_changes(
+        &self,
+        package: PackageInterfaceHandle,
+        path: String,
+    ) -> Result<Option<String>>;
 }