import type { FieldNode, DocumentNode, FieldDefinitionNode } from 'graphql';
export declare class ExternalQuery {
    private typeName;
    externalType: boolean;
    fieldDefinition: FieldDefinitionNode;
    protected fields: Set<FieldNode>;
    protected keys: Set<string>;
    constructor(typeName: string, externalType: boolean, fieldDefinition: FieldDefinitionNode);
    addField(field: FieldNode): void;
    addKeys(keys: Array<string>): void;
    get keyQuery(): DocumentNode;
    get query(): DocumentNode;
    private buildResolveTypeQuery;
    private buildExtendTypeQuery;
}