1 files changed, 30 insertions, 0 deletions
diff --git a/vendor/github.com/vektah/gqlparser/validator/rules/no_unused_variables.go b/vendor/github.com/vektah/gqlparser/validator/rules/no_unused_variables.go
new file mode 100644
index 00000000..28cf7736
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/validator/rules/no_unused_variables.go
@@ -0,0 +1,30 @@
+package validator
+
+import (
+	"github.com/vektah/gqlparser/ast"
+	. "github.com/vektah/gqlparser/validator"
+)
+
+func init() {
+	AddRule("NoUnusedVariables", func(observers *Events, addError AddErrFunc) {
+		observers.OnOperation(func(walker *Walker, operation *ast.OperationDefinition) {
+			for _, varDef := range operation.VariableDefinitions {
+				if varDef.Used {
+					continue
+				}
+
+				if operation.Name != "" {
+					addError(
+						Message(`Variable "$%s" is never used in operation "%s".`, varDef.Variable, operation.Name),
+						At(varDef.Position),
+					)
+				} else {
+					addError(
+						Message(`Variable "$%s" is never used.`, varDef.Variable),
+						At(varDef.Position),
+					)
+				}
+			}
+		})
+	})
+}