import { ApiPromise } from '@polkadot/api';
import { RegisteredTypes } from '@polkadot/types/types';
import { ApiConnectionError, NetworkMetadataPayload, IApiConnectionSpecific, IBlock } from '@subql/node-core';
import { IEndpointConfig } from '@subql/types-core';
import * as SubstrateUtil from '../utils/substrate';
import { ApiAt, BlockContent, LightBlockContent } from './types';
export type FetchFunc = typeof SubstrateUtil.fetchBlocksBatches | typeof SubstrateUtil.fetchBlocksBatchesLight;
export type GetFetchFunc = () => FetchFunc;
export declare class ApiPromiseConnection implements IApiConnectionSpecific<ApiPromise, ApiAt, IBlock<BlockContent>[] | IBlock<LightBlockContent>[]> {
    unsafeApi: ApiPromise;
    private fetchBlocksBatches;
    readonly networkMeta: NetworkMetadataPayload;
    private constructor();
    static create(endpoint: string, fetchBlocksBatches: GetFetchFunc, args: {
        chainTypes?: RegisteredTypes;
    }, config: IEndpointConfig): Promise<ApiPromiseConnection>;
    safeApi(height: number): ApiAt;
    fetchBlocks(heights: number[], overallSpecVer?: number): Promise<IBlock<BlockContent>[] | IBlock<LightBlockContent>[]>;
    apiConnect(): Promise<void>;
    apiDisconnect(): Promise<void>;
    updateChainTypes(chainTypes: RegisteredTypes): Promise<void>;
    handleError: typeof ApiPromiseConnection.handleError;
    static handleError(e: Error): ApiConnectionError;
}