import { type DocumentNode } from 'graphql';
import { type GraphQLSchemaNormalizedConfig } from 'graphql/type/schema';
import { type BuildASTSchemaOptions } from './buildASTSchema';
export declare class AccumulatorMap<K, T> extends Map<K, Array<T>> {
    get [Symbol.toStringTag](): string;
    add(key: K, item: T): void;
}
export declare function mapValue<T, V>(map: ReadOnlyObjMap<T>, fn: (value: T, key: string) => V): ObjMap<V>;
export interface ObjMap<T> {
    [key: string]: T;
}
export type ObjMapLike<T> = ObjMap<T> | {
    [key: string]: T;
};
export interface ReadOnlyObjMap<T> {
    readonly [key: string]: T;
}
export type ReadOnlyObjMapLike<T> = ReadOnlyObjMap<T> | {
    readonly [key: string]: T;
};
export declare function extendSchemaImpl(schemaConfig: GraphQLSchemaNormalizedConfig, documentAST: DocumentNode, options?: BuildASTSchemaOptions): GraphQLSchemaNormalizedConfig;