refactor: add errorlint and refactor error (#192)

.golangci.yml

@@ -8,6 +8,7 @@ linters:
   enable:
     - exportloopref
     - errcheck
+    - errorlint
     - gci
     - gocritic
     - gofumpt

app/app.go

@@ -721,7 +721,7 @@ func NewFeeAbs(
 		},
 	)
 	if err != nil {
-		panic(fmt.Errorf("failed to create AnteHandler: %s", err))
+		panic(fmt.Errorf("failed to create AnteHandler: %w", err))
 	}
 
 	app.SetAnteHandler(anteHandler)

cmd/feeappd/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"os"
 
 	"github.com/cosmos/cosmos-sdk/server"
@@ -16,10 +17,10 @@ func main() {
 	rootCmd, _ := cmd.NewRootCmd()
 
 	if err := svrcmd.Execute(rootCmd, "", app.DefaultNodeHome); err != nil {
-		switch e := err.(type) {
-		case server.ErrorCode:
+		var e server.ErrorCode
+		switch {
+		case errors.As(err, &e):
 			os.Exit(e.Code)
-
 		default:
 			os.Exit(1)
 		}

x/feeabs/types/genesis.go

@@ -19,7 +19,7 @@ func DefaultGenesis() *GenesisState {
 func (gs GenesisState) Validate() error {
 	err := gs.Params.Validate()
 	if err != nil {
-		return fmt.Errorf("invalid params %s", err)
+		return fmt.Errorf("invalid params %w", err)
 	}
 
 	// Validate epochs genesis