diff --git a/cmd/typels/main.go b/cmd/typels/main.go
new file mode 100644
index 0000000..19f1366
--- /dev/null
+++ b/cmd/typels/main.go
@@ -0,0 +1,84 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/gostaticanalysis/knife"
+)
+
+var (
+	flagFilter   string
+	flagExported bool
+)
+
+func init() {
+	flag.StringVar(&flagFilter, "f", "all", "object filter(all|interface|func|struct|chan|array|slice|map)")
+	flag.BoolVar(&flagExported, "exported", false, "filter only exported types")
+	flag.Parse()
+}
+
+func main() {
+	if err := run(flag.Args()); err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func run(args []string) error {
+	k, err := knife.New(args...)
+	if err != nil {
+		return err
+	}
+
+	var w io.Writer = os.Stdout
+
+	pkgs := k.Packages()
+	for i, pkg := range pkgs {
+
+		kpkg := knife.NewPackage(pkg.Types)
+
+		if len(pkgs) > 1 {
+			fmt.Fprintf(w, "# %s\n", kpkg.Path)
+		}
+
+		for name, typ := range kpkg.Types {
+			if flagExported && !typ.Exported {
+				continue
+			}
+
+			if typ.Exported && match(flagFilter, typ) {
+				fmt.Fprintln(w, name)
+			}
+		}
+
+		if i != len(pkgs)-1 {
+			fmt.Fprintln(w)
+		}
+	}
+
+	return nil
+}
+
+func match(filter string, typ *knife.TypeName) bool {
+	switch filter {
+	case "interface":
+		return knife.ToInterface(typ) != nil
+	case "func":
+		return knife.ToSignature(typ) != nil
+	case "struct":
+		return knife.ToStruct(typ) != nil
+	case "chan":
+		return knife.ToChan(typ) != nil
+	case "array":
+		return knife.ToArray(typ) != nil
+	case "slice":
+		return knife.ToSlice(typ) != nil
+	case "map":
+		return knife.ToMap(typ) != nil
+	default:
+		return true
+	}
+}
diff --git a/go.mod b/go.mod
index d83c207..e735be3 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/gostaticanalysis/knife
 
-go 1.14
+go 1.18
 
 require (
 	github.com/gostaticanalysis/analysisutil v0.6.2
@@ -8,3 +8,10 @@ require (
 	github.com/gostaticanalysis/comment v1.4.2
 	golang.org/x/tools v0.1.1-0.20210302220138-2ac05c832e1a
 )
+
+require (
+	github.com/antchfx/xpath v1.1.10 // indirect
+	golang.org/x/mod v0.4.1 // indirect
+	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+)
diff --git a/go.sum b/go.sum
index e85eedc..e7ffaf5 100644
--- a/go.sum
+++ b/go.sum
@@ -17,10 +17,8 @@ github.com/hashicorp/go-version v1.2.1/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09
 github.com/otiai10/copy v1.2.0 h1:HvG945u96iNadPoG2/Ja2+AUJeW5YuFQMixq9yirC+k=
 github.com/otiai10/copy v1.2.0/go.mod h1:rrF5dJ5F0t/EWSYODDu4j9/vEeYHMkc8jt0zJChqQWw=
 github.com/otiai10/curr v0.0.0-20150429015615-9b4961190c95/go.mod h1:9qAhocn7zKJG+0mI8eUu6xqkFDYS2kb2saOteoSB3cE=
-github.com/otiai10/curr v1.0.0 h1:TJIWdbX0B+kpNagQrjgq8bCMrbhiuX73M2XwgtDMoOI=
 github.com/otiai10/curr v1.0.0/go.mod h1:LskTG5wDwr8Rs+nNQ+1LlxRjAtTZZjtJW4rMXl6j4vs=
 github.com/otiai10/mint v1.3.0/go.mod h1:F5AjcsTsWUqX+Na9fpHb52P8pcRX2CI6A3ctIT91xUo=
-github.com/otiai10/mint v1.3.1 h1:BCmzIS3n71sGfHB5NMNDB3lHYPz8fWSkCAErHed//qc=
 github.com/otiai10/mint v1.3.1/go.mod h1:/yxELlJQ0ufhjUwhshSj+wFjZ78CnZ48/1wtmBH1OTc=
 github.com/tenntenn/modver v1.0.1 h1:2klLppGhDgzJrScMpkj9Ujy3rXPUspSjAcev9tSEBgA=
 github.com/tenntenn/modver v1.0.1/go.mod h1:bePIyQPb7UeioSRkw3Q0XeMhYZSMx9B8ePqg6SAMGH0=