1 files changed, 10 insertions, 0 deletions
diff --git a/common.go b/common.go
index d60f5d9..dc35931 100644
--- a/common.go
+++ b/common.go
@@ -3,8 +3,18 @@ package git
 import (
 	"io"
 	"strings"
+
+	"gopkg.in/src-d/go-git.v4/config"
+	"gopkg.in/src-d/go-git.v4/core"
 )
 
+// Storage storage of objects and references
+type Storage interface {
+	ConfigStorage() config.ConfigStorage
+	ObjectStorage() core.ObjectStorage
+	ReferenceStorage() core.ReferenceStorage
+}
+
 // countLines returns the number of lines in a string à la git, this is
 // The newline character is assumed to be '\n'.  The empty string
 // contains 0 lines.  If the last line of the string doesn't end with a