import BigNumber from "bignumber.js";
import Web3 from "web3";
export type Address = string;
export declare abstract class Snapshot {
}
export type BigNumberString = string;
export interface SwapData {
    addr: string;
    extra: string;
}
export declare abstract class Pair {
    pairKey: string | null;
    tokenA: Address;
    tokenB: Address;
    private swappaPairAddress;
    private swappaPair;
    constructor(web3: Web3, swappaPairAddress: Address);
    init(): Promise<void>;
    protected abstract _init(): Promise<{
        pairKey: string | null;
        tokenA: Address;
        tokenB: Address;
    }>;
    abstract refresh(): Promise<void>;
    swapData(inputToken: Address): SwapData;
    protected abstract swapExtraData(inputToken: Address): string;
    abstract outputAmount(inputToken: Address, inputAmount: BigNumber): BigNumber;
    outputAmountAsync: (inputToken: Address, inputAmount: BigNumber) => Promise<BigNumber>;
    abstract snapshot(): Snapshot;
    abstract restore(snapshot: Snapshot): void;
}