declare const SINGLE_FOREIGN_FORMATS: readonly ["father-son", "related", "many-one", "one-one", "one-one-r"];
export type TSingleForeignFormat = typeof SINGLE_FOREIGN_FORMATS[number];
export declare function isSingleForeignFormat(format: string): format is TSingleForeignFormat;
export declare function isFormatNeedFetch(format: string): boolean;
export {};