import { GraphQLError } from "../../../error/GraphQLError.mjs";
import { getNamedType } from "../../../type/definition.mjs";
import { isIntrospectionType } from "../../../type/introspection.mjs";

/**
 * Prohibit introspection queries
 *
 * A GraphQL document is only valid if all fields selected are not fields that
 * return an introspection type.
 *
 * Note: This rule is optional and is not part of the Validation section of the
 * GraphQL Specification. This rule effectively disables introspection, which
 * does not reflect best practices and should only be done if absolutely necessary.
 */
export function NoSchemaIntrospectionCustomRule(context) {
  return {
    Field: function Field(node) {
      var type = getNamedType(context.getType());

      if (type && isIntrospectionType(type)) {
        context.reportError(new GraphQLError("GraphQL introspection has been disabled, but the requested query contained the field \"".concat(node.name.value, "\"."), node));
      }
    }
  };
}