flow like the river

VISUALIZACION/node_modules/graphql/validation/rules/NoUnusedVariablesRule.mjs

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+import { GraphQLError } from "../../error/GraphQLError.mjs";
+
+/**
+ * No unused variables
+ *
+ * A GraphQL operation is only valid if all variables defined by an operation
+ * are used, either directly or within a spread fragment.
+ */
+export function NoUnusedVariablesRule(context) {
+  var variableDefs = [];
+  return {
+    OperationDefinition: {
+      enter: function enter() {
+        variableDefs = [];
+      },
+      leave: function leave(operation) {
+        var variableNameUsed = Object.create(null);
+        var usages = context.getRecursiveVariableUsages(operation);
+
+        for (var _i2 = 0; _i2 < usages.length; _i2++) {
+          var _ref2 = usages[_i2];
+          var node = _ref2.node;
+          variableNameUsed[node.name.value] = true;
+        }
+
+        for (var _i4 = 0, _variableDefs2 = variableDefs; _i4 < _variableDefs2.length; _i4++) {
+          var variableDef = _variableDefs2[_i4];
+          var variableName = variableDef.variable.name.value;
+
+          if (variableNameUsed[variableName] !== true) {
+            context.reportError(new GraphQLError(operation.name ? "Variable \"$".concat(variableName, "\" is never used in operation \"").concat(operation.name.value, "\".") : "Variable \"$".concat(variableName, "\" is never used."), variableDef));
+          }
+        }
+      }
+    },
+    VariableDefinition: function VariableDefinition(def) {
+      variableDefs.push(def);
+    }
+  };
+}