Initial QSfera import

Server/vendor/github.com/gookit/goutil/comdef/errors.go

@@ -0,0 +1,38 @@
+package comdef
+
+import (
+	"errors"
+	"strings"
+)
+
+// ErrConvType error
+var ErrConvType = errors.New("convert value type error")
+
+// Errors multi error list
+type Errors []error
+
+// Error string
+func (es Errors) Error() string {
+	var sb strings.Builder
+	for _, err := range es {
+		sb.WriteString(err.Error())
+		sb.WriteByte('\n')
+	}
+	return sb.String()
+}
+
+// ErrOrNil error
+func (es Errors) ErrOrNil() error {
+	if len(es) == 0 {
+		return nil
+	}
+	return es
+}
+
+// First error
+func (es Errors) First() error {
+	if len(es) > 0 {
+		return es[0]
+	}
+	return nil
+}