import { Address, BaseAmount, TokenAsset } from '@xchainjs/xchain-util';
import { Signer, Contract, Provider, InterfaceAbi } from 'ethers';
import BigNumber from 'bignumber.js';
/**
 * Maximum approval amount possible, set to 2^256 - 1.
 */
export declare const MAX_APPROVAL: BigNumber;
/**
 * Validate the given address.
 *
 * @param {Address} address The address to validate.
 * @returns {boolean} `true` if the address is valid, otherwise `false`.
 */
export declare const validateAddress: (address: Address) => boolean;
/**
 * Get token address from asset.
 *
 * @param {TokenAsset} asset The asset to extract the token address from.
 * @returns {Address|null} The token address if found, otherwise `null`.
 */
export declare const getTokenAddress: (asset: TokenAsset) => Address | null;
/**
 * Check if the symbol is valid.
 *
 * @param {string|null|undefined} symbol The symbol to validate.
 * @returns {boolean} `true` if the symbol is valid and has a length of at least 3, otherwise `false`.
 */
export declare const validateSymbol: (symbol?: string | null) => boolean;
/**
 * Calculate fees by multiplying gas price and gas limit.
 *
 * @returns {Fees} The calculated fee.
 */
export declare const getFee: ({ gasPrice, gasLimit, decimals, }: {
    gasPrice: BaseAmount;
    gasLimit: BigNumber;
    decimals: number;
}) => BaseAmount;
/**
 * Get address prefix based on the network.
 *
 * @returns {string} The address prefix based on the network ('0x').
 */
export declare const getPrefix: () => string;
/**
 * Filter self transactions from an array of transactions.
 *
 * @param {T[]} txs The transactions array.
 * @returns {T[]} The filtered transactions array with self transactions removed.
 */
export declare const filterSelfTxs: <T extends {
    from: string;
    to: string;
    hash: string;
}>(txs: T[]) => T[];
/**
 * Returns approval amount. If amount is not provided, returns `MAX_APPROVAL`.
 * An explicit amount (including zero) is returned as-is, enabling revocation.
 *
 * @param {BaseAmount} amount The amount to check.
 * @returns {ethers.BigNumber} The approval amount.
 */
export declare const getApprovalAmount: (amount?: BaseAmount) => BigNumber;
/**
 * Estimate gas required for calling a contract function.
 *
 * @param {object} params Parameters for estimating gas.
 * @param {Provider} provider Provider to interact with the contract.
 * @param {Address} contractAddress The contract address.
 * @param {ContractInterface} abi The contract ABI json.
 * @param {string} funcName The function to be called.
 * @param {unknown[]} funcParams The parameters of the function.
 * @returns {BigNumber} The estimated gas required for the function call.
 */
export declare const estimateCall: ({ provider, contractAddress, abi, funcName, funcParams, }: {
    provider: Provider;
    contractAddress: Address;
    abi: InterfaceAbi;
    funcName: string;
    funcParams?: unknown[];
}) => Promise<BigNumber>;
/**
 * Calls a contract function.
 *
 * @param {Provider} provider The provider to interact with the contract.
 * @param {Signer} signer The signer of the transaction (optional - needed for sending transactions only).
 * @param {Address} contractAddress The contract address.
 * @param {ContractInterface} abi The contract ABI json.
 * @param {string} funcName The function to be called.
 * @param {unknown[]} funcParams (optional) The parameters of the function.
 * @returns {Promise<T>} The result of the contract function call.
 */
export declare const call: <T>({ provider, signer, contractAddress, abi, funcName, funcParams, }: {
    provider: Provider;
    signer?: Signer;
    contractAddress: Address;
    abi: InterfaceAbi;
    funcName: string;
    funcParams?: unknown[];
}) => Promise<T>;
/**
 * Load a contract.
 *
 * @param {Provider} provider The provider to interact with the contract.
 * @param {Address} contractAddress The contract address.
 * @param {ContractInterface} abi The contract ABI json.
 * @returns {Promise<ethers.Contract>} The loaded contract instance.
 */
export declare const getContract: ({ provider, contractAddress, abi, }: {
    provider: Provider;
    contractAddress: Address;
    abi: InterfaceAbi;
}) => Promise<Contract>;
/**
 * Estimate gas for calling `approve`.
 *
 * @param {Provider} provider The provider to interact with the contract.
 * @param {Address} contractAddress The contract address.
 * @param {Address} spenderAddress The spender address.
 * @param {Address} fromAddress The address a transaction is sent from.
 * @param {ContractInterface} abi The contract ABI json.
 * @param {BaseAmount} amount (optional) The amount of token. By default, it will be unlimited token allowance.
 * @returns {Promise<ethers.BigNumber>} The estimated gas.
 */
export declare function estimateApprove({ provider, contractAddress, spenderAddress, fromAddress, abi, amount, }: {
    provider: Provider;
    contractAddress: Address;
    spenderAddress: Address;
    fromAddress: Address;
    abi: InterfaceAbi;
    amount?: BaseAmount;
}): Promise<BigNumber>;
/**
 * Get the current allowance for a spender on a token contract.
 *
 * @param {Provider} provider The provider to interact with the contract.
 * @param {Address} contractAddress The contract (ERC20 token) address.
 * @param {Address} spenderAddress The spender address (router).
 * @param {Address} fromAddress The token owner address.
 * @returns {Promise<BigNumber>} The current allowance.
 */
export declare function getAllowance({ provider, contractAddress, spenderAddress, fromAddress, }: {
    provider: Provider;
    contractAddress: Address;
    spenderAddress: Address;
    fromAddress: Address;
}): Promise<BigNumber>;
/**
 * Check allowance.
 *
 * @param {Provider} provider The provider to interact with the contract.
 * @param {Address} contractAddress The contract (ERC20 token) address.
 * @param {Address} spenderAddress The spender address (router).
 * @param {Address} fromAddress The address a transaction is sent from.
 * @param {BaseAmount} amount The amount to check if it's allowed to spend or not (optional).
 * @param {number} walletIndex (optional) HD wallet index
 * @returns {Promise<boolean>} `true` if the spender is allowed to spend the specified amount, `false` otherwise.
 */
export declare function isApproved({ provider, contractAddress, spenderAddress, fromAddress, amount, }: {
    provider: Provider;
    contractAddress: Address;
    spenderAddress: Address;
    fromAddress: Address;
    amount?: BaseAmount;
}): Promise<boolean>;
/**
 * Removes `0x` or `0X` from the beginning of the address string.
 *
 * @param {Address} addr The address to remove the `0x` or `0X` prefix from.
 * @returns {string} The address without the `0x` or `0X` prefix.
 */
export declare const strip0x: (addr: Address) => string;
/**
 * Get the chain identifier the provider is connected with
 * @param {Provider} provider Provider
 * @returns {number} the chain identifier the provider is connected with
 */
export declare const getNetworkId: (provider: Provider) => Promise<number>;