import { VsAgent } from '../../agent';
import { IndexerActivity, VeranaSyncState } from '../types';
export interface IndexerHandlerContext {
    agent: VsAgent;
    blockHeight: number;
    operatorAddress: string;
    state: VeranaSyncState;
    txHash: string;
}
export interface IndexerEventHandler<TMsg extends string = string> {
    readonly msg: TMsg;
    handle(activity: IndexerActivity, ctx: IndexerHandlerContext): Promise<void>;
}
/**
 * Registry for handlers of indexer events. Handlers can be registered/unregistered at runtime
 * and are looked up by the `msg` field of indexer activities.
 */
export declare class IndexerHandlerRegistry {
    private handlers;
    register(handler: IndexerEventHandler): void;
    unregister(msg: string): void;
    get(msg: string): IndexerEventHandler | undefined;
    has(msg: string): boolean;
    keys(): string[];
    clear(): void;
    dispatch(activity: IndexerActivity, ctx: IndexerHandlerContext): Promise<void>;
}