import type { providers } from 'ethers';
import type { DispatchedMessage } from '@hyperlane-xyz/sdk';
/**
 * Relayer events, useful for metrics and monitoring
 */
export type RelayerEvent = {
    type: 'messageRelayed';
    message: DispatchedMessage;
    originChain: string;
    destinationChain: string;
    messageId: string;
    durationMs: number;
    dispatchTx?: providers.TransactionReceipt;
} | {
    type: 'messageFailed';
    message: DispatchedMessage;
    originChain: string;
    destinationChain: string;
    messageId: string;
    error: Error;
    dispatchTx?: providers.TransactionReceipt;
} | {
    type: 'messageSkipped';
    message: DispatchedMessage;
    originChain: string;
    destinationChain: string;
    messageId: string;
    reason: 'whitelist' | 'already_delivered';
    dispatchTx?: providers.TransactionReceipt;
} | {
    type: 'retry';
    message: DispatchedMessage;
    originChain: string;
    destinationChain: string;
    messageId: string;
    attempt: number;
} | {
    type: 'backlog';
    size: number;
};
export interface RelayerObserver {
    onEvent?: (event: RelayerEvent) => void;
}
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