graphql/validation/rules/NoUndefinedVariablesRule.mjs

import { GraphQLError } from "../../error/GraphQLError.mjs";

/**
 * No undefined variables
 *
 * A GraphQL operation is only valid if all variables encountered, both directly
 * and via fragment spreads, are defined by that operation.
 */
export function NoUndefinedVariablesRule(context) {
  var variableNameDefined = Object.create(null);
  return {
    OperationDefinition: {
      enter: function enter() {
        variableNameDefined = Object.create(null);
      },
      leave: function leave(operation) {
        var usages = context.getRecursiveVariableUsages(operation);

        for (var _i2 = 0; _i2 < usages.length; _i2++) {
          var _ref2 = usages[_i2];
          var node = _ref2.node;
          var varName = node.name.value;

          if (variableNameDefined[varName] !== true) {
            context.reportError(new GraphQLError(operation.name ? "Variable \"$".concat(varName, "\" is not defined by operation \"").concat(operation.name.value, "\".") : "Variable \"$".concat(varName, "\" is not defined."), [node, operation]));
          }
        }
      }
    },
    VariableDefinition: function VariableDefinition(node) {
      variableNameDefined[node.variable.name.value] = true;
    }
  };
}