import { SwapStatus, type SwapStatusEvent } from '@layerswap/widget-types';
/** The identity of a status notification: a backend status change for one swap. */
export type SwapStatusIdentity = Pick<SwapStatusEvent, 'swapId' | 'type'>;
/**
 * Every non-identity field of a status notification. These are a snapshot at
 * transition time and never trigger or repeat a delivery. Adding a field to
 * SwapStatusEvent fails check:types until it is classified here.
 */
export declare const SWAP_STATUS_CONTEXT_FIELDS: readonly Exclude<keyof SwapStatusEvent, keyof SwapStatusIdentity>[];
/** Notification policy is applied after observation, never before recording the baseline. */
export declare const REPORTED_SWAP_STATUSES: ReadonlySet<SwapStatus>;
/** One backend history per widget, independent of modal lifetime and wallet attempts. */
export declare function createSwapStatusObserver(): {
    created(swapId: string): void;
    observe(event: Pick<SwapStatusEvent, "swapId" | "type">): boolean;
};
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