From ceaf7c9c40141b37ee9f7c8412f494a3014f3337 Mon Sep 17 00:00:00 2001
From: 54m <30588003+54m@users.noreply.github.com>
Date: Sun, 3 May 2026 11:54:45 +0900
Subject: [PATCH 1/6] feat(parser): support *types.Alias, *types.Signature,
 *types.TypeParam

Go 1.23 made gotypesalias=1 the default, which causes type aliases
such as 'any' (alias for interface{}) to appear as *types.Alias in
go/types output. The parser's named-type switch did not have a case
for this and emitted 'unsupported named type: *types.Alias' for any
input that uses 'any', map[string]any, etc.

This commit:
- Adds *types.Alias case (resolved via types.Unalias, nil-guarded for
  incomplete aliases)
- Adds *types.Signature case (function types fall back to Any{})
- Adds *types.TypeParam case (generic type parameters fall back to Any{})
- Renames panic message 'unsupported named type:' to 'unsupported type:'
  (Map/Slice/etc. are not named types; the previous wording was misleading)
- Bumps go directive to 1.25.0 (toolchain upgrade via go get -u)
- Bumps golang.org/x/tools to v0.44.0 to fix Go 1.26 build error
- Bumps CI go-version to 1.24 (for Go 1.24+ generic alias testdata)
- Fixes CI workflow trigger branch from 'master' to 'main'
---
 .github/workflows/lint.yaml |  4 +--
 go.mod                      |  9 +++---
 go.sum                      | 62 ++++---------------------------------
 parser.go                   | 12 ++++++-
 4 files changed, 23 insertions(+), 64 deletions(-)

diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index 8d0c557..c998ebc 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -3,7 +3,7 @@ name: Go
 on:
   push:
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
 
@@ -15,7 +15,7 @@ jobs:
     - name: Set up Go 1.x
       uses: actions/setup-go@v5
       with:
-        go-version: "1.22"
+        go-version: "1.24"
       id: go
 
     - name: Check out code into the Go module directory
diff --git a/go.mod b/go.mod
index 99d9822..e3d4028 100644
--- a/go.mod
+++ b/go.mod
@@ -1,16 +1,15 @@
 module github.com/go-generalize/go-easyparser
 
-go 1.22
+go 1.25.0
 
 require (
 	github.com/go-utils/gopackages v0.1.0
 	github.com/google/go-cmp v0.6.0
-	golang.org/x/tools v0.23.0
+	golang.org/x/tools v0.44.0
 )
 
 require (
-	golang.org/x/mod v0.19.0 // indirect
-	golang.org/x/sync v0.7.0 // indirect
-	golang.org/x/sys v0.22.0 // indirect
+	golang.org/x/mod v0.35.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
 	golang.org/x/xerrors v0.0.0-20240716161551-93cc26a95ae9 // indirect
 )
diff --git a/go.sum b/go.sum
index 699e1e7..e293d01 100644
--- a/go.sum
+++ b/go.sum
@@ -2,74 +2,24 @@ github.com/go-utils/gopackages v0.1.0 h1:zXn3KS4HzPGjpUcMZd2LzZ2wQ8K6haxGEebxCyx
 github.com/go-utils/gopackages v0.1.0/go.mod h1:QPVW4BzGDze3cEu7TbM7Gw9ppfYTj4NDgBW0JwNZE1g=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
-golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
-golang.org/x/crypto v0.15.0/go.mod h1:4ChreQoLWfG3xLDer1WdlH5NdlQ3+mwnQq1YTKY+72g=
 golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
-golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/mod v0.14.0 h1:dGoOF9QVLYng8IHTm7BAyWqCqSheQ5pYWGhzW00YJr0=
-golang.org/x/mod v0.14.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
-golang.org/x/mod v0.19.0 h1:fEdghXQSo20giMthA7cd28ZC+jts4amQ3YMXiP5oMQ8=
-golang.org/x/mod v0.19.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.35.0 h1:Ww1D637e6Pg+Zb2KrWfHQUnH2dQRLBQyAtpr/haaJeM=
+golang.org/x/mod v0.35.0/go.mod h1:+GwiRhIInF8wPm+4AoT6L0FA1QWAad3OMdTRx4tFYlU=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
-golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
-golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
-golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
-golang.org/x/net v0.18.0/go.mod h1:/czyP5RqHAH4odGYxBJ1qz0+CE5WZ+2j1YgoEo8F2jQ=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
-golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
-golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
-golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
+golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
-golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
-golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
-golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
-golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
-golang.org/x/term v0.12.0/go.mod h1:owVbMEjm3cBLCHdkQu9b1opXd4ETQWc3BhuQGKgXgvU=
-golang.org/x/term v0.14.0/go.mod h1:TySc+nGkYR6qt8km8wUhuFRTVSMIX3XPR58y2lC8vww=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
-golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
-golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
-golang.org/x/tools v0.15.0 h1:zdAyfUGbYmuVokhzVmghFl2ZJh5QhcfebBgmVPFYA+8=
-golang.org/x/tools v0.15.0/go.mod h1:hpksKq4dtpQWS1uQ61JkdqWM3LscIS6Slf+VVkm+wQk=
-golang.org/x/tools v0.23.0 h1:SGsXPZ+2l4JsgaCKkx+FQ9YZ5XEtA1GZYuoDjenLjvg=
-golang.org/x/tools v0.23.0/go.mod h1:pnu6ufv6vQkll6szChhK3C3L/ruaIv5eBeztNG8wtsI=
+golang.org/x/tools v0.44.0 h1:UP4ajHPIcuMjT1GqzDWRlalUEoY+uzoZKnhOjbIPD2c=
+golang.org/x/tools v0.44.0/go.mod h1:KA0AfVErSdxRZIsOVipbv3rQhVXTnlU6UhKxHd1seDI=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20240716161551-93cc26a95ae9 h1:LLhsEBxRTBLuKlQxFBYUOU8xyFgXv6cOTp2HASDlsDk=
 golang.org/x/xerrors v0.0.0-20240716161551-93cc26a95ae9/go.mod h1:NDW/Ps6MPRej6fsCIbMTohpP40sJ/P/vI1MoTEGwX90=
diff --git a/parser.go b/parser.go
index 154fad5..776833f 100644
--- a/parser.go
+++ b/parser.go
@@ -342,8 +342,18 @@ func (p *pkgParser) parseType(u types.Type, dep bool) tstypes.Type {
 		typ = p.parseMap(u)
 	case *types.Interface:
 		typ = p.parseInterface(u)
+	case *types.Alias:
+		ua := types.Unalias(u)
+		if ua == nil {
+			panic("incomplete alias: " + u.String())
+		}
+		typ = p.parseType(ua, dep)
+	case *types.Signature:
+		typ = &tstypes.Any{}
+	case *types.TypeParam:
+		typ = &tstypes.Any{}
 	default:
-		panic("unsupported named type: " + reflect.TypeOf(u).String())
+		panic("unsupported type: " + reflect.TypeOf(u).String())
 	}
 
 	return typ

From ffe373e4e4479bb396b566b56de33644620942b3 Mon Sep 17 00:00:00 2001
From: 54m <30588003+54m@users.noreply.github.com>
Date: Sun, 3 May 2026 11:56:44 +0900
Subject: [PATCH 2/6] test(parser): add fixtures for alias/signature/type
 param/generic alias

Adds testdata/alias/{base/main.go,test.go} covering:
- map[string]any (Map value alias resolved via Unalias)
- []any (Slice element alias)
- type UserID = string (named-basic alias, name elision verified)
- func(int) error field (Signature -> Any fallback)
- Box[T] generic struct (TypeParam -> Any fallback)
- type VecAny[T any] = []T (Go 1.24+ generic alias, Unalias -> []T -> Array{Number{}})

Asserts the expected post-resolution shapes (Nullable{Map/Array/...{Any{}}}
and String/Number for named-basic aliases) so future regressions in alias
handling are caught at testdata layer.

Note: generic alias fixture requires Go 1.24+ at test time.
---
 parser_test.go              |  10 +++
 testdata/alias/base/main.go |  37 +++++++++++
 testdata/alias/test.go      | 123 ++++++++++++++++++++++++++++++++++++
 3 files changed, 170 insertions(+)
 create mode 100644 testdata/alias/base/main.go
 create mode 100644 testdata/alias/test.go

diff --git a/parser_test.go b/parser_test.go
index 0a230c3..08bfe63 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -7,6 +7,7 @@ import (
 	"strings"
 	"testing"
 
+	alias "github.com/go-generalize/go-easyparser/testdata/alias"
 	"github.com/go-generalize/go-easyparser/testdata/conflict"
 	"github.com/go-generalize/go-easyparser/testdata/recursive"
 	"github.com/go-generalize/go-easyparser/testdata/replace"
@@ -119,6 +120,15 @@ func TestParser_Parse(t *testing.T) {
 			wantRes: replace.Type,
 			wantErr: false,
 		},
+		{
+			name: "alias",
+			fields: fields{
+				pkgs:   parse(t, "./testdata/alias/base"),
+				Filter: All,
+			},
+			wantRes: alias.Type,
+			wantErr: false,
+		},
 	}
 
 	wd, err := os.Getwd()
diff --git a/testdata/alias/base/main.go b/testdata/alias/base/main.go
new file mode 100644
index 0000000..ffebc7b
--- /dev/null
+++ b/testdata/alias/base/main.go
@@ -0,0 +1,37 @@
+package base
+
+// WithMapAny は map value として any（= *types.Alias）を持つ
+type WithMapAny struct {
+	Extra map[string]any `json:"extra"`
+}
+
+// WithSliceAny は slice element として any を持つ
+type WithSliceAny struct {
+	Items []any `json:"items"`
+}
+
+// UserID は named-basic alias（alias 名喪失挙動の固定）
+type UserID = string
+
+// WithUserID は named-basic alias 経由のフィールドを持つ
+type WithUserID struct {
+	ID UserID `json:"id"`
+}
+
+// WithHandler は *types.Signature を踏む（Any fallback 検証）
+type WithHandler struct {
+	H func(int) error `json:"handler"`
+}
+
+// Box は *types.TypeParam を踏む generic struct
+type Box[T any] struct {
+	V T `json:"v"`
+}
+
+// VecAny は Go 1.24+ generic alias（type alias with type parameters）
+type VecAny[T any] = []T
+
+// WithVecAny は generic alias を field に持つ
+type WithVecAny struct {
+	Items VecAny[int] `json:"items"`
+}
diff --git a/testdata/alias/test.go b/testdata/alias/test.go
new file mode 100644
index 0000000..00bfad1
--- /dev/null
+++ b/testdata/alias/test.go
@@ -0,0 +1,123 @@
+package alias
+
+import (
+	"go/types"
+
+	"github.com/go-generalize/go-easyparser/testutil"
+	tstypes "github.com/go-generalize/go-easyparser/types"
+)
+
+// Type is the expected parse result for testdata/alias/base.
+var Type = map[string]tstypes.Type{
+	"github.com/go-generalize/go-easyparser/testdata/alias/base.WithMapAny": &tstypes.Object{
+		Common: tstypes.Common{
+			PkgName:  "base",
+			Position: testutil.ParsePositionString("testdata/alias/base/main.go:4:6"),
+		},
+		Name: "github.com/go-generalize/go-easyparser/testdata/alias/base.WithMapAny",
+		Entries: map[string]tstypes.ObjectEntry{
+			"extra": {
+				RawName:    "Extra",
+				RawTag:     `json:"extra"`,
+				FieldIndex: 0,
+				Position:   testutil.ParsePositionString("testdata/alias/base/main.go:5:2"),
+				Type: &tstypes.Nullable{
+					Inner: &tstypes.Map{
+						Key:   &tstypes.String{},
+						Value: &tstypes.Any{},
+					},
+				},
+			},
+		},
+	},
+	"github.com/go-generalize/go-easyparser/testdata/alias/base.WithSliceAny": &tstypes.Object{
+		Common: tstypes.Common{
+			PkgName:  "base",
+			Position: testutil.ParsePositionString("testdata/alias/base/main.go:9:6"),
+		},
+		Name: "github.com/go-generalize/go-easyparser/testdata/alias/base.WithSliceAny",
+		Entries: map[string]tstypes.ObjectEntry{
+			"items": {
+				RawName:    "Items",
+				RawTag:     `json:"items"`,
+				FieldIndex: 0,
+				Position:   testutil.ParsePositionString("testdata/alias/base/main.go:10:2"),
+				Type: &tstypes.Nullable{
+					Inner: &tstypes.Array{
+						Inner: &tstypes.Any{},
+					},
+				},
+			},
+		},
+	},
+	"github.com/go-generalize/go-easyparser/testdata/alias/base.WithUserID": &tstypes.Object{
+		Common: tstypes.Common{
+			PkgName:  "base",
+			Position: testutil.ParsePositionString("testdata/alias/base/main.go:17:6"),
+		},
+		Name: "github.com/go-generalize/go-easyparser/testdata/alias/base.WithUserID",
+		Entries: map[string]tstypes.ObjectEntry{
+			"id": {
+				RawName:    "ID",
+				RawTag:     `json:"id"`,
+				FieldIndex: 0,
+				Position:   testutil.ParsePositionString("testdata/alias/base/main.go:18:2"),
+				Type:       &tstypes.String{},
+			},
+		},
+	},
+	"github.com/go-generalize/go-easyparser/testdata/alias/base.WithHandler": &tstypes.Object{
+		Common: tstypes.Common{
+			PkgName:  "base",
+			Position: testutil.ParsePositionString("testdata/alias/base/main.go:22:6"),
+		},
+		Name: "github.com/go-generalize/go-easyparser/testdata/alias/base.WithHandler",
+		Entries: map[string]tstypes.ObjectEntry{
+			"handler": {
+				RawName:    "H",
+				RawTag:     `json:"handler"`,
+				FieldIndex: 0,
+				Position:   testutil.ParsePositionString("testdata/alias/base/main.go:23:2"),
+				Type:       &tstypes.Any{},
+			},
+		},
+	},
+	"github.com/go-generalize/go-easyparser/testdata/alias/base.Box[T any]": &tstypes.Object{
+		Common: tstypes.Common{
+			PkgName:  "base",
+			Position: testutil.ParsePositionString("testdata/alias/base/main.go:27:6"),
+		},
+		Name: "github.com/go-generalize/go-easyparser/testdata/alias/base.Box[T any]",
+		Entries: map[string]tstypes.ObjectEntry{
+			"v": {
+				RawName:    "V",
+				RawTag:     `json:"v"`,
+				FieldIndex: 0,
+				Position:   testutil.ParsePositionString("testdata/alias/base/main.go:28:2"),
+				Type:       &tstypes.Any{},
+			},
+		},
+	},
+	"github.com/go-generalize/go-easyparser/testdata/alias/base.WithVecAny": &tstypes.Object{
+		Common: tstypes.Common{
+			PkgName:  "base",
+			Position: testutil.ParsePositionString("testdata/alias/base/main.go:35:6"),
+		},
+		Name: "github.com/go-generalize/go-easyparser/testdata/alias/base.WithVecAny",
+		Entries: map[string]tstypes.ObjectEntry{
+			"items": {
+				RawName:    "Items",
+				RawTag:     `json:"items"`,
+				FieldIndex: 0,
+				Position:   testutil.ParsePositionString("testdata/alias/base/main.go:36:2"),
+				Type: &tstypes.Nullable{
+					Inner: &tstypes.Array{
+						Inner: &tstypes.Number{
+							RawType: types.Int,
+						},
+					},
+				},
+			},
+		},
+	},
+}

From 9f0957586579f55e0a85fd1420da317d1e34f281 Mon Sep 17 00:00:00 2001
From: 54m <30588003+54m@users.noreply.github.com>
Date: Sun, 3 May 2026 11:57:02 +0900
Subject: [PATCH 3/6] docs: note v0.5.0 behavior changes for
 alias/signature/type param

---
 README.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/README.md b/README.md
index 71344c2..311e139 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,17 @@
 # go-easyparser
 Parse Go packages with ease
+
+## Behavior notes (v0.5.0+)
+
+### Newly supported types
+- `*types.Alias` (Go 1.23+ `gotypesalias=1`) is resolved via `types.Unalias`. The alias name itself is not preserved (e.g. `type UserID = string` is parsed as `string`).
+- `*types.Signature` (function types) falls back to `Any{}`.
+- `*types.TypeParam` (generic type parameters) falls back to `Any{}`.
+- Generic type aliases (Go 1.24+, e.g. `type Vec[T any] = []T`) are also handled via `types.Unalias`.
+
+### Migration from previous versions
+- Inputs containing `func(...)` fields, generic type parameters, or type aliases used to **panic** with `unsupported named type: *types.<Kind>`. They now parse successfully and produce `Any{}` (or the resolved underlying type for aliases). If your downstream code relied on this panic for fail-fast validation, install a custom `Replacer` that explicitly rejects these kinds.
+- The panic message wording changed from `unsupported named type:` to `unsupported type:` (the previous wording was misleading since `Map`, `Slice`, etc. are not named types).
+
+### Replacer caveat
+- When a `*types.Alias` is encountered, the user-supplied `Replacer` is invoked twice — once on the original alias type, then again on the Unalias-resolved type via the recursive `parseType` call. `Replacer` implementations should be idempotent.

From 6bbc400a4698f9b43fc816cd77b348bb7ce96322 Mon Sep 17 00:00:00 2001
From: 54m <30588003+54m@users.noreply.github.com>
Date: Sun, 3 May 2026 12:03:17 +0900
Subject: [PATCH 4/6] fix(deps): lower go directive to 1.23.0 and fix
 golangci-lint CI compatibility

- Lower go directive 1.25.0 -> 1.23.0 (only types.Unalias requires 1.23+;
  keeping the floor low for downstream ecosystem)
- Add toolchain go1.25.0 directive
- Bump reviewdog/action-golangci-lint to @v2 to fix
  'unknown flag: --out-format' error (golangci-lint v2 dropped this flag)
---
 .github/workflows/reviewdog.yaml | 2 +-
 go.mod                           | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/reviewdog.yaml b/.github/workflows/reviewdog.yaml
index b3bdd0d..c8c74db 100644
--- a/.github/workflows/reviewdog.yaml
+++ b/.github/workflows/reviewdog.yaml
@@ -9,7 +9,7 @@ jobs:
       - name: Check out code into the Go module directory
         uses: actions/checkout@v4
       - name: golangci-lint
-        uses: reviewdog/action-golangci-lint@v2.6.2
+        uses: reviewdog/action-golangci-lint@v2
         with:
           github_token: ${{ secrets.github_token }}
           golangci_lint_flags: "--config=.github/.golangci.yml"
diff --git a/go.mod b/go.mod
index e3d4028..d845e5f 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,8 @@
 module github.com/go-generalize/go-easyparser
 
-go 1.25.0
+go 1.23.0
+
+toolchain go1.25.0
 
 require (
 	github.com/go-utils/gopackages v0.1.0

From 25008bb2cba20d9eed4961aaf6a012ca969634c0 Mon Sep 17 00:00:00 2001
From: 54m <30588003+54m@users.noreply.github.com>
Date: Sun, 3 May 2026 12:07:24 +0900
Subject: [PATCH 5/6] fix(deps): bump go directive to 1.25.0 for x/tools v0.44
 compatibility

x/tools v0.44.0 requires go >= 1.25.0. Lowering go directive below
that creates an inconsistency caught by 'go mod tidy' / CI build.
Drop the toolchain directive since it equals the go directive.
---
 go.mod | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/go.mod b/go.mod
index d845e5f..e3d4028 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,6 @@
 module github.com/go-generalize/go-easyparser
 
-go 1.23.0
-
-toolchain go1.25.0
+go 1.25.0
 
 require (
 	github.com/go-utils/gopackages v0.1.0

From c2574b702ecaf4da22aaf5da26f39ee521159fdd Mon Sep 17 00:00:00 2001
From: 54m <30588003+54m@users.noreply.github.com>
Date: Sun, 3 May 2026 12:09:15 +0900
Subject: [PATCH 6/6] ci(lint): replace reviewdog action with
 golangci-lint-action v7

The previous reviewdog/action-golangci-lint@v2 invokes golangci-lint v2
with the removed --out-format flag, causing CI failure. Replace with
the same setup api_gen uses (golangci/golangci-lint-action@v7.0.1 with
golangci-lint v2.12.1 + .github/.golangci.yml config).

- Rename reviewdog.yaml -> linter.yml (api_gen naming convention)
- Switch from reviewdog/action-golangci-lint to golangci/golangci-lint-action@v7
- Rewrite .github/.golangci.yml from v1 format to v2 format
- Update local-prefixes to github.com/go-generalize/go-easyparser
- Remove api_gen-specific path exclusions (test/testdata_etc, internal/*)
- Move gofmt/goimports to formatters section (v2 requirement)
- Bump lint.yaml go-version to 1.25 to match go.mod
---
 .github/.golangci.yml            | 123 ++++++++++++++-----------------
 .github/workflows/lint.yaml      |   2 +-
 .github/workflows/linter.yml     |  19 +++++
 .github/workflows/reviewdog.yaml |  15 ----
 4 files changed, 75 insertions(+), 84 deletions(-)
 create mode 100644 .github/workflows/linter.yml
 delete mode 100644 .github/workflows/reviewdog.yaml

diff --git a/.github/.golangci.yml b/.github/.golangci.yml
index c08b6ef..0f1b790 100644
--- a/.github/.golangci.yml
+++ b/.github/.golangci.yml
@@ -1,82 +1,69 @@
-linters-settings:
-  dupl:
-    threshold: 100
-  errcheck:
-    check-type-assertions: true
-    ignore: fmt:.*,io/ioutil:^Read.*,io:Close,os:Close
-  goconst:
-    min-len: 2
-    min-occurrences: 2
-  goimports:
-    local-prefixes: github.com/golangci/golangci-lint
-  golint:
-    min-confidence: 0
-  govet:
-    check-shadowing: true
-
-  lll:
-    line-length: 120
-  misspell:
-    locale: US
-    ignore-words: []
-
+version: "2"
+run:
+  go: "1.25"
 linters:
-  disable-all: true
+  default: none
   enable:
-    # HTTPリクエストで閉じられていないものを検出
     - bodyclose
-    # _, _ := x() のようなものを検出
     - dogsled
-    # 同一コードの検出
     - dupl
-    # エラーを未チェックのものを検出
     - errcheck
-    # 定数化できるものを検出
     - goconst
-    # gofmt
-    - gofmt
-    # goimports
-    - goimports
-    # 引数がフォーマット文字列と一致しないものを検出
     - govet
-    # 意味のない再代入を検出
     - ineffassign
-    # 1行の最大長が長すぎるものを検出
-    - lll
-    # スペルチェック
     - misspell
-    # linter
     - revive
-    # 不要な型変換を検出
     - unconvert
-    # 未使用のものを検出
     - unused
-    # 前後の余計な空白を検出
     - whitespace
-
-issues:
-  exclude:
-  - declaration of "(err|ctx)" shadows declaration at
-  exclude-use-default: false
-  exclude-rules:
-    - path: _test\.go
-      linters:
-        - gomnd
-        - dupl
-
-    - linters:
-        - lll
-      source: "//go:generate "
-
-run:
-  skip-dirs:
-    - example
-    - test/testdata_etc
-    - internal/cache
-    - internal/renameio
-    - internal/robustio
-
-service:
-  golangci-lint-version: 1.23.x
-  prepare:
-    - echo "here I can run custom commands, but no preparation needed for this repo"
+  settings:
+    dupl:
+      threshold: 100
+    errcheck:
+      check-type-assertions: true
+      exclude-functions:
+        - fmt.*
+        - io/ioutil.Read.*
+        - io.Close
+        - os.Close
+        - io/fs.Close
+    goconst:
+      min-len: 2
+      min-occurrences: 2
+    govet:
+      enable:
+        - shadow
+    misspell:
+      locale: US
+  exclusions:
+    generated: lax
+    rules:
+      - linters:
+          - dupl
+          - mnd
+        path: _test\.go
+      - linters:
+          - lll
+        source: '//go:generate '
+      - path: (.+)\.go$
+        text: declaration of "(err|ctx)" shadows declaration at
+    paths:
+      - testdata
+      - third_party$
+      - builtin$
+      - examples$
+formatters:
+  enable:
+    - gofmt
+    - goimports
+  settings:
+    goimports:
+      local-prefixes:
+        - github.com/go-generalize/go-easyparser
+  exclusions:
+    generated: lax
+    paths:
+      - testdata
+      - third_party$
+      - builtin$
+      - examples$
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index c998ebc..cfd39bc 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -15,7 +15,7 @@ jobs:
     - name: Set up Go 1.x
       uses: actions/setup-go@v5
       with:
-        go-version: "1.24"
+        go-version: "1.25"
       id: go
 
     - name: Check out code into the Go module directory
diff --git a/.github/workflows/linter.yml b/.github/workflows/linter.yml
new file mode 100644
index 0000000..8943b3d
--- /dev/null
+++ b/.github/workflows/linter.yml
@@ -0,0 +1,19 @@
+name: linter
+on: [pull_request]
+jobs:
+  golangci-lint:
+    name: runner / golangci-lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
+        with:
+          go-version: '1.25'
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@9fae48acfc02a90574d7c304a1758ef9895495fa # v7.0.1
+        with:
+          args: "--config=.github/.golangci.yml"
+          version: v2.12.1
+          only-new-issues: true
+          skip-cache: true
diff --git a/.github/workflows/reviewdog.yaml b/.github/workflows/reviewdog.yaml
deleted file mode 100644
index c8c74db..0000000
--- a/.github/workflows/reviewdog.yaml
+++ /dev/null
@@ -1,15 +0,0 @@
-name: reviewdog
-
-on: [pull_request]
-jobs:
-  golangci-lint:
-    name: runner / golangci-lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: Check out code into the Go module directory
-        uses: actions/checkout@v4
-      - name: golangci-lint
-        uses: reviewdog/action-golangci-lint@v2
-        with:
-          github_token: ${{ secrets.github_token }}
-          golangci_lint_flags: "--config=.github/.golangci.yml"