import { DocumentNode, GraphQLOutputType, GraphQLSchema } from 'graphql';
import { Types } from './types.cjs';
export declare function normalizeOutputParam(config: Types.ConfiguredOutput | Types.ConfiguredOutput[]): Types.ConfiguredOutput[];
export declare function normalizeInstanceOrArray<T>(type: T | T[] | null | undefined): T[];
export declare function normalizeConfig(config: Types.OutputConfig | Types.OutputConfig[] | null | undefined): Types.ConfiguredPlugin[];
export declare function hasNullableTypeRecursively(type: GraphQLOutputType): boolean;
export declare function isUsingTypes(document: DocumentNode, externalFragments: string[], schema?: GraphQLSchema): boolean;