import { QueryKey, QueryKeyHash } from '@cubejs-backend/base-driver';
import { CacheKey, LocalRefreshKeyDescriptor } from './QueryCache';
/**
 * Unique process ID regexp.
 */
export declare const processUidRE: RegExp;
/**
 * Returns query hash by specified `queryKey`.
 */
export declare function getCacheHash(queryKey: QueryKey | CacheKey, processUid?: string): QueryKeyHash;
/**
 * `nowMs` is not floored to whole seconds first: for an integer `interval >= 1` the
 * fractional part cannot cross a boundary, which is also why the fractional seconds of
 * `EXTRACT(EPOCH FROM NOW())` never mattered on the SQL path.
 *
 * The key is a string because `contentVersion` and the query cache `renewalKey` hash it
 * through `JSON.stringify`: `2980310` and `"2980310"` are different keys, so a number here
 * would rebuild every pre-aggregation the first time the flag is switched on. A string is
 * also what the SQL path yields — an `every` key runs against Cube Store whenever an
 * external store is configured, and Cube Store carries every column as a string.
 */
export declare function evaluateLocalRefreshKey(descriptor: LocalRefreshKeyDescriptor, nowMs?: number): [{
    refresh_key: string;
}];
export declare function isValidLocalRefreshKey(descriptor?: LocalRefreshKeyDescriptor): descriptor is LocalRefreshKeyDescriptor;
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