diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1a762c1412b..9aae18f7534 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -16,5 +16,5 @@ jobs:
       - run: go generate ./... && if [[ $(git --no-pager diff) ]] ; then echo "you need to run go generate" ; git --no-pager diff ; exit 1 ; fi
       - run: go vet ./...
       - run: go test -race ./...
-      - run: gometalinter ./example/... ./codegen/... ./handler/...
+      - run: gometalinter --vendor ./...
 
diff --git a/client/websocket.go b/client/websocket.go
index 8bd7382a0a8..555ddd5b9e6 100644
--- a/client/websocket.go
+++ b/client/websocket.go
@@ -10,16 +10,10 @@ import (
 )
 
 const (
-	connectionInitMsg      = "connection_init"      // Client -> Server
-	connectionTerminateMsg = "connection_terminate" // Client -> Server
-	startMsg               = "start"                // Client -> Server
-	stopMsg                = "stop"                 // Client -> Server
-	connectionAckMsg       = "connection_ack"       // Server -> Client
-	connectionErrorMsg     = "connection_error"     // Server -> Client
-	connectionKeepAliveMsg = "ka"                   // Server -> Client
-	dataMsg                = "data"                 // Server -> Client
-	errorMsg               = "error"                // Server -> Client
-	completeMsg            = "complete"             // Server -> Client
+	connectionInitMsg = "connection_init" // Client -> Server
+	startMsg          = "start"           // Client -> Server
+	connectionAckMsg  = "connection_ack"  // Server -> Client
+	dataMsg           = "data"            // Server -> Client
 )
 
 type operationMessage struct {
@@ -62,7 +56,7 @@ func (p *Client) Websocket(query string, options ...Option) *Subscription {
 	}
 
 	var ack operationMessage
-	if err := c.ReadJSON(&ack); err != nil {
+	if err = c.ReadJSON(&ack); err != nil {
 		return errorSubscription(fmt.Errorf("ack: %s", err.Error()))
 	}
 	if ack.Type != connectionAckMsg {
@@ -90,7 +84,7 @@ func (p *Client) Websocket(query string, options ...Option) *Subscription {
 
 			if respDataRaw["errors"] != nil {
 				var errs []*errors.QueryError
-				if err := unpack(respDataRaw["errors"], errs); err != nil {
+				if err = unpack(respDataRaw["errors"], errs); err != nil {
 					return err
 				}
 				if len(errs) > 0 {
diff --git a/main.go b/main.go
index a48a251bd2a..e7040b60416 100644
--- a/main.go
+++ b/main.go
@@ -63,13 +63,14 @@ func main() {
 	}
 	config.SchemaStr = string(schemaRaw)
 
-	if err := config.Check(); err != nil {
+	if err = config.Check(); err != nil {
 		fmt.Fprintln(os.Stderr, "invalid config format: "+err.Error())
 		os.Exit(1)
 	}
 
 	if emitYamlGuidance {
-		b, err := yaml.Marshal(config)
+		var b []byte
+		b, err = yaml.Marshal(config)
 		if err != nil {
 			fmt.Fprintln(os.Stderr, "unable to marshal yaml: "+err.Error())
 			os.Exit(1)