/** @internal */
export interface StoredFilter {
    filter: string;
    parserVersion: string;
    timeUsed: Date;
}
/**
 * JSON shape as stored. timeUsed arrives as an ISO string after JSON.parse,
 * but may also be a Date when returned from addFilterToState (before serialization).
 * @internal
 */
export interface RawStoredFilter {
    filter: string;
    parserVersion?: string;
    timeUsed?: Date | string;
}
/**
 * Re-hydrate a JSON-parsed filter array, converting timeUsed strings back to Dates.
 * @internal
 */
export declare function parseStoredFilters(raw: RawStoredFilter[] | undefined): StoredFilter[];
/**
 * Update logic for saving a filter to the store.
 * @internal
 */
export declare function addFilterToState(storedFilters: StoredFilter[], filter: string, limit: number): StoredFilter[];
/**
 * Update logic for unpinning a filter
 * @internal
 */
export declare function removeFilterFromState(storedFilters: StoredFilter[], filter: string): StoredFilter[];