fix: Lint errors

client.go

@@ -380,7 +380,7 @@ func (client *Client) processEvent(event *Event, hint *EventHint, scope EventMod
 		return nil
 	}
 
-	if event.Type != "transaction" && options.BeforeSend != nil {
+	if event.Type != transactionType && options.BeforeSend != nil {
 		h := &EventHint{}
 		if hint != nil {
 			h = hint

interfaces.go

@@ -16,6 +16,9 @@ import (
 // Level marks the severity of the event
 type Level string
 
+// transactionType refers to an transaction event
+const transactionType = "transaction"
+
 const (
 	LevelDebug   Level = "debug"
 	LevelInfo    Level = "info"
@@ -223,21 +226,26 @@ func (e *Event) MarshalJSON() ([]byte, error) {
 		}{
 			alias: (*alias)(e),
 		})
-	} else if e.Timestamp.IsZero() {
+	}
+
+	if e.Timestamp.IsZero() {
 		return json.Marshal(&struct {
 			*alias
 			Timestamp json.RawMessage `json:"timestamp,omitempty"`
 		}{
 			alias: (*alias)(e),
 		})
-	} else if e.StartTimestamp.IsZero() {
+	}
+
+	if e.StartTimestamp.IsZero() {
 		return json.Marshal(&struct {
 			*alias
 			StartTimestamp json.RawMessage `json:"start_timestamp,omitempty"`
 		}{
 			alias: (*alias)(e),
 		})
 	}
+
 	return json.Marshal(&struct {
 		*alias
 	}{

interfaces_test.go

@@ -15,7 +15,7 @@ import (
 	"github.com/google/go-cmp/cmp"
 )
 
-var update = flag.Bool("update", false, "update .golden files")
+var update = flag.Bool("update", false, "update .golden files") //nolint: gochecknoglobals
 
 func TestNewRequest(t *testing.T) {
 	const payload = `{"test_data": true}`
@@ -66,6 +66,7 @@ func TestMarshalStruct(t *testing.T) {
 	}
 
 	for _, test := range testCases {
+		test := test
 		t.Run(test.testName, func(t *testing.T) {
 			got, err := json.MarshalIndent(test.sentryStruct, "", "    ")
 			if err != nil {
@@ -74,7 +75,7 @@ func TestMarshalStruct(t *testing.T) {
 
 			golden := filepath.Join(".", "testdata", fmt.Sprintf("%s.golden", test.testName))
 			if *update {
-				err := ioutil.WriteFile(golden, got, 0644)
+				err := ioutil.WriteFile(golden, got, 0600)
 				if err != nil {
 					t.Error(err)
 				}

transport.go

@@ -109,7 +109,7 @@ func getRequestFromEvent(event *Event, dsn *Dsn) (*http.Request, error) {
 		return nil, errors.New("event could not be marshalled")
 	}
 
-	if event.Type == "transaction" {
+	if event.Type == transactionType {
 		env := getEnvelopeFromBody(body)
 		request, _ := http.NewRequest(
 			http.MethodPost,

transport_test.go

@@ -175,7 +175,7 @@ func TestGetRequestFromEvent(t *testing.T) {
 			testName: "Transaction",
 			event: func() *Event {
 				event := NewEvent()
-				event.Type = "transaction"
+				event.Type = transactionType
 
 				return event
 			}(),
@@ -184,6 +184,7 @@ func TestGetRequestFromEvent(t *testing.T) {
 	}
 
 	for _, test := range testCases {
+		test := test
 		t.Run(test.testName, func(t *testing.T) {
 			dsn, err := NewDsn("https://key@host/path/42")
 			if err != nil {