client.Enqueue - prevent empty task's typename

client.go

@@ -178,6 +178,9 @@ func (d processInOption) Value() interface{} { return time.Duration(d) }
 // ErrDuplicateTask error only applies to tasks enqueued with a Unique option.
 var ErrDuplicateTask = errors.New("task already exists")
 
+// ErrEmptyTypeTask indicates that task's typename is not specified.
+var ErrEmptyTypeTask = errors.New("task typename not specified")
+
 type option struct {
 	retry     int
 	queue     string
@@ -266,6 +269,9 @@ func (c *Client) Close() error {
 //
 // If no ProcessAt or ProcessIn options are provided, the task will be pending immediately.
 func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
+	if task.Type() == "" {
+		return nil, fmt.Errorf("%w", ErrEmptyTypeTask)
+	}
 	c.mu.Lock()
 	if defaults, ok := c.opts[task.Type()]; ok {
 		opts = append(defaults, opts...)