import { DeepReadonly } from 'ts-essentials';
import { PartialEventSubscriber } from '../../composed-event-subscriber';
import { Address, BlockHeader, Log, Logger, MultiCallInput, MultiCallOutput } from '../../types';
import { Lens } from '../../lens';
import { Interface } from '@ethersproject/abi';
import { ChainLinkState } from '../../lib/chainlink';
export declare class BackedSubscriber<State> extends PartialEventSubscriber<State, ChainLinkState> {
    private proxy;
    private aggregator;
    static readonly proxyInterface: Interface;
    static readonly ANSWER_UPDATED_TOPIC: string;
    constructor(proxy: Address, aggregator: Address, lens: Lens<DeepReadonly<State>, DeepReadonly<ChainLinkState>>, logger: Logger);
    static getReadDecimal(proxy: Address): MultiCallInput;
    static readDecimals(multicallOutput: MultiCallOutput): Address;
    processLog(state: DeepReadonly<ChainLinkState>, log: Readonly<Log>, blockHeader: Readonly<BlockHeader>): DeepReadonly<ChainLinkState> | null;
    getGenerateStateMultiCallInputs(): MultiCallInput[];
    generateState(multicallOutputs: MultiCallOutput[], blockNumber?: number | 'latest'): DeepReadonly<ChainLinkState>;
    getLatestRoundData(state: DeepReadonly<State>): bigint;
}