feat: add iotyper linter

.golangci.next.reference.yml

@@ -77,6 +77,7 @@ linters:
     - interfacebloat
     - intrange
     - iotamixing
+    - iotyper
     - ireturn
     - lll
     - loggercheck
@@ -192,6 +193,7 @@ linters:
     - interfacebloat
     - intrange
     - iotamixing
+    - iotyper
     - ireturn
     - lll
     - loggercheck

go.mod

@@ -14,6 +14,7 @@ require (
 	github.com/Antonboom/nilnil v1.1.1
 	github.com/Antonboom/testifylint v1.6.4
 	github.com/BurntSushi/toml v1.5.0
+	github.com/CyberAgent/iotyper-lint v0.0.0-20251126071057-12b4d357612a
 	github.com/Djarvur/go-err113 v0.1.1
 	github.com/MirrexOne/unqueryvet v1.3.0
 	github.com/OpenPeeDeeP/depguard/v2 v2.2.1
@@ -218,7 +219,7 @@ require (
 	go.uber.org/zap v1.27.0 // indirect
 	golang.org/x/exp v0.0.0-20240909161429-701f63a606c0 // indirect
 	golang.org/x/exp/typeparams v0.0.0-20251023183803-a4bb9ffd2546 // indirect
-	golang.org/x/text v0.30.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
 	golang.org/x/tools/go/expect v0.1.1-deprecated // indirect
 	golang.org/x/tools/go/packages/packagestest v0.1.1-deprecated // indirect
 	google.golang.org/protobuf v1.36.8 // indirect

pkg/golinters/iotyper/iotyper.go

@@ -0,0 +1,13 @@
+package iotyper
+
+import (
+	"github.com/CyberAgent/iotyper-lint"
+
+	"github.com/golangci/golangci-lint/v2/pkg/goanalysis"
+)
+
+func New() *goanalysis.Linter {
+	return goanalysis.
+		NewLinterFromAnalyzer(iotyper.Analyzer).
+		WithLoadMode(goanalysis.LoadModeSyntax)
+}

pkg/golinters/iotyper/iotyper_integration_test.go

@@ -0,0 +1,11 @@
+package iotyper
+
+import (
+	"testing"
+
+	"github.com/golangci/golangci-lint/v2/test/testshared/integration"
+)
+
+func TestFromTestdata(t *testing.T) {
+	integration.RunTestdata(t)
+}

pkg/golinters/iotyper/testdata/iotyper.go

@@ -0,0 +1,45 @@
+//golangcitest:args -Eiotyper
+package testdata
+
+// Basic iota without type
+const (
+	BasicWithoutType = iota // want "iota used without type specification"
+)
+
+// Single-line const declarations
+const SingleLineWithoutType = iota  // want "iota used without type specification"
+const SingleLineWithType int = iota // OK: has type
+
+// Multiple constants with inherited iota
+const (
+	FirstInGroup  = iota // want "iota used without type specification"
+	SecondInGroup        // No warning: inherits iota value but doesn't use iota directly
+	ThirdInGroup         // No warning: same as above
+)
+
+// Non-iota constants (no warnings expected)
+const (
+	PlainNumber = 42
+	PlainString = "hello"
+	PlainBool   = true
+)
+
+// iota in expressions
+const (
+	IotaPlusOne  = iota + 1  // want "iota used without type specification"
+	IotaShifted  = 1 << iota // want "iota used without type specification"
+	IotaMultiple = iota * 2  // want "iota used without type specification"
+)
+
+// iota with explicit type
+const (
+	WithTypeInt      int = iota // OK: explicit int type
+	WithTypeIntAgain int = iota // OK: explicit int type
+)
+
+// Mixed type specifications
+const (
+	MixedWithType      int = iota // OK: has type
+	MixedWithoutType       = iota // want "iota used without type specification"
+	MixedAgainWithType int = iota // OK: has type
+)

pkg/lint/lintersdb/builder_linter.go

@@ -65,6 +65,7 @@ import (
 	"github.com/golangci/golangci-lint/v2/pkg/golinters/interfacebloat"
 	"github.com/golangci/golangci-lint/v2/pkg/golinters/intrange"
 	"github.com/golangci/golangci-lint/v2/pkg/golinters/iotamixing"
+	"github.com/golangci/golangci-lint/v2/pkg/golinters/iotyper"
 	"github.com/golangci/golangci-lint/v2/pkg/golinters/ireturn"
 	"github.com/golangci/golangci-lint/v2/pkg/golinters/lll"
 	"github.com/golangci/golangci-lint/v2/pkg/golinters/loggercheck"
@@ -457,6 +458,10 @@ func (LinterBuilder) Build(cfg *config.Config) ([]*linter.Config, error) {
 			WithSince("v2.5.0").
 			WithURL("https://github.com/AdminBenni/iota-mixing"),
 
+		linter.NewConfig(iotyper.New()).
+			WithSince("v2.7.0").
+			WithURL("https://github.com/CyberAgent/iotyper-lint"),
+
 		linter.NewConfig(ireturn.New(&cfg.Linters.Settings.Ireturn)).
 			WithSince("v1.43.0").
 			WithLoadForGoAnalysis().