import { GraphQLSchema, SelectionSetNode, TypeNode } from 'graphql';
export declare function getArgsFromKeysForFederation(representations: readonly any[]): {
    representations: readonly any[];
};
export declare function getKeyForFederation<TRoot>(root: TRoot): TRoot;
export declare function projectDataSelectionSet(data: any, selectionSet?: SelectionSetNode): any;
export declare function getKeyFnForFederation(typeName: string, keys: string[]): (root: any) => any;
export declare function getCacheKeyFnFromKey(key: string): (root: any) => any;
export declare function filterInternalFieldsAndTypes(finalSchema: GraphQLSchema): GraphQLSchema;
export declare function getNamedTypeNode(typeNode: TypeNode): import("graphql").NamedTypeNode;
type EventMap<T> = Record<keyof T, any[]>;
export declare class EventEmitter<T extends EventMap<T>> {
    #private;
    on<K extends keyof T>(eventName: K, listener: (...args: T[K]) => void): this;
    once<K extends keyof T>(eventName: K, listener: (...args: T[K]) => void): this;
    off<K extends keyof T>(eventName: K, listener: (...args: T[K]) => void): this;
    emit<K extends keyof T>(eventName: K, ...args: T[K]): boolean;
}
export {};