/**
 * Marker interface. When a listener implements this, the dispatcher
 * can push it onto the queue instead of running it inline.
 */
export interface ShouldQueue {
    /** Queue name to dispatch on. Defaults to 'default'. */
    queue?: string;
    /** Connection name. Defaults to 'default'. */
    connection?: string;
    /** Number of retry attempts before marking failed. */
    tries?: number;
    /** Backoff in seconds between retries. */
    backoff?: number[];
    /** Called when all retries are exhausted. */
    failed?(event: unknown, error: Error): void;
    /** Return false to abort dispatching this listener. */
    shouldDispatch?(event: unknown): boolean;
}
/**
 * Runtime marker to indicate a listener should be queued.
 *
 * Because TypeScript interfaces do not exist at runtime, listeners must opt-in by
 * setting a static property:
 *
 * ```ts
 * export class MyListener implements ShouldQueue {
 *   static [SHOULD_QUEUE_LISTENER] = true
 * }
 * ```
 */
export declare const SHOULD_QUEUE_LISTENER: unique symbol;
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