From 890dff2213ae15e1a952471d3218577e93265bb6 Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Sat, 16 May 2026 08:20:35 +0000
Subject: object/typ: Simplify

---
 object/typ/errors.go       |  5 +++++
 object/typ/type.go         | 15 ++++++---------
 object/typ/type_details.go |  1 -
 object/typ/type_ops.go     |  9 ++-------
 object/typ/type_parse.go   |  8 ++++++--
 5 files changed, 19 insertions(+), 19 deletions(-)
 create mode 100644 object/typ/errors.go

diff --git a/object/typ/errors.go b/object/typ/errors.go
new file mode 100644
index 00000000..8a442db0
--- /dev/null
+++ b/object/typ/errors.go
@@ -0,0 +1,5 @@
+package typ
+
+import "errors"
+
+var ErrInvalidType = errors.New("object/typ: Invalid type")
\ No newline at end of file
diff --git a/object/typ/type.go b/object/typ/type.go
index 5f7decc1..7a317479 100644
--- a/object/typ/type.go
+++ b/object/typ/type.go
@@ -4,18 +4,15 @@ package typ
 type Type uint8
 
 const (
-	// TypeInvalid represents an invalid Git object type.
-	TypeInvalid Type = 0
-
-	// TypeCommit represents a Git commit.
-	TypeCommit Type = 1
+	// TypeBlob represents a Git blob.
+	TypeBlob Type = iota
 
 	// TypeTree represents a Git tree.
-	TypeTree Type = 2
+	TypeTree
 
-	// TypeBlob represents a Git blob.
-	TypeBlob Type = 3
+	// TypeCommit represents a Git commit.
+	TypeCommit
 
 	// TypeTag represents a Git tag.
-	TypeTag Type = 4
+	TypeTag
 )
diff --git a/object/typ/type_details.go b/object/typ/type_details.go
index ebe1bbbe..f8a18837 100644
--- a/object/typ/type_details.go
+++ b/object/typ/type_details.go
@@ -10,7 +10,6 @@ func (ty Type) details() typeDetails {
 
 //nolint:gochecknoglobals
 var typeTable = [...]typeDetails{
-	TypeInvalid: {name: ""},
 	TypeCommit:  {name: "commit"},
 	TypeTree:    {name: "tree"},
 	TypeBlob:    {name: "blob"},
diff --git a/object/typ/type_ops.go b/object/typ/type_ops.go
index 535c7296..81570ab8 100644
--- a/object/typ/type_ops.go
+++ b/object/typ/type_ops.go
@@ -1,11 +1,6 @@
 package typ
 
 // Name returns the canonical Git object type name.
-func (ty Type) Name() (string, bool) {
-	details := ty.details()
-	if details.name == "" {
-		return "", false
-	}
-
-	return details.name, true
+func (ty Type) Name() (string) {
+	return ty.details().name
 }
diff --git a/object/typ/type_parse.go b/object/typ/type_parse.go
index a39a1949..3b69fc09 100644
--- a/object/typ/type_parse.go
+++ b/object/typ/type_parse.go
@@ -1,8 +1,12 @@
 package typ
 
 // Parse parses a canonical Git object type name.
-func Parse(name string) (Type, bool) {
+func Parse(name string) (Type, error) {
 	ty, ok := typeByName[name]
 
-	return ty, ok
+	if !ok {
+		return 0, ErrInvalidType
+	}
+
+	return ty, nil
 }
-- 
cgit v1.3.1-10-gc9f91