import { type BUN_MARIADB_QueueTableOptions } from "../../types";
/**
 * Current time in ms from the database clock. Leases are set and checked
 * with this so workers on hosts with drifting clocks agree on expiry.
 */
export declare const QUEUE_NOW_SQL = "CAST(UNIX_TIMESTAMP(NOW(3)) * 1000 AS SIGNED)";
/**
 * Extra WHERE condition for generic update/delete on queue tables: rows a
 * worker has claimed are only changed through the queue API.
 */
export declare const QUEUE_NOT_CLAIMED_SQL = "`queue_status` <> 'processing'";
export type ResolvedQueueTableOptions = Required<BUN_MARIADB_QueueTableOptions>;
/**
 * A table's `queue_table` options with defaults filled in (looked up
 * directly or through its parent table), or `undefined` if it is not a
 * queue table.
 */
export declare function grabQueueTableOptions(tableName: string): ResolvedQueueTableOptions | undefined;
/**
 * Whether a table is declared with `queue_table` (directly or through its
 * parent table).
 */
export declare function isQueueTable(tableName: string): boolean;
/**
 * Queue options for a table the queue API was called on. Throws if the table
 * is not a queue table.
 */
export declare function requireQueueTable(tableName: string): ResolvedQueueTableOptions;
/**
 * Throw if `data` sets queue state the queue API owns.
 */
export declare function assertNoProtectedQueueFields(table: string, data: {
    [k: string]: any;
}[]): void;