@graphql-tools/graphql/esm/validation/rules/custom/NoSchemaIntrospectionCustomRule.js

Fork of GraphQL.js

import { GraphQLError } from '../../../error/GraphQLError.js';
import { getNamedType } from '../../../type/definition.js';
import { isIntrospectionType } from '../../../type/introspection.js';
/**
 * 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(node) {
            const type = getNamedType(context.getType());
            if (type && isIntrospectionType(type)) {
                context.reportError(new GraphQLError(`GraphQL introspection has been disabled, but the requested query contained the field "${node.name.value}".`, { nodes: node }));
            }
        },
    };
}