import BigNumber from 'bignumber.js';
import { Token } from '../utils/token';
/**
 * Get the allowance of a token
 * @param token The token to get the balance of
 * @param account The account address
 * @param spender The spender contract address
 * @returns The allowance of the token in BigNumber (decimal parsed). Returns null if empty or loading
 */
export declare const useTokenAllowance: (token?: Token, account?: string, spender?: string) => BigNumber;
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