import { OnApplicationShutdown } from '@nestjs/common';
import { EventEmitter2 } from '@nestjs/event-emitter';
import { ApiPromise } from '@polkadot/api';
import { BlockHash } from '@polkadot/types/interfaces';
import { SubqueryProject } from '../configure/project.model';
import { NetworkMetadataPayload } from './events';
import { ApiAt } from './types';
export declare class ApiService implements OnApplicationShutdown {
    protected project: SubqueryProject;
    private eventEmitter;
    private api;
    private currentBlockHash;
    private currentRuntimeVersion;
    private apiOption;
    networkMeta: NetworkMetadataPayload;
    constructor(project: SubqueryProject, eventEmitter: EventEmitter2);
    onApplicationShutdown(): Promise<void>;
    init(): Promise<ApiService>;
    getApi(): ApiPromise;
    getPatchedApi(blockHash: string | BlockHash, parentBlockHash?: string | BlockHash): Promise<ApiAt>;
    private redecorateRpcFunction;
    private patchApiRpc;
}