export declare const $functions: unique symbol;
export declare const $schema: unique symbol;
export declare const $adapter: unique symbol;
export declare const $collectionGroups: unique symbol;
export declare const $docLabel: unique symbol;
export declare const $allow: unique symbol;
export declare const $array: unique symbol;
export declare const arrayKey = "__fireschema_array_key__";
export declare const hasArraySymbol: <T, U>(obj: T | {
    [$array]: U;
}) => obj is {
    [$array]: U;
};