import { providers } from 'ethers';
import BaseService from '../commons/BaseService';
import { EthereumTransactionTypeExtended, tEthereumAddress } from '../commons/types';
import { IERC20Detailed } from './typechain/IERC20Detailed';
export interface IERC20ServiceInterface {
    decimalsOf: (token: tEthereumAddress) => Promise<number>;
    getTokenData: (token: tEthereumAddress) => Promise<TokenMetadataType>;
    isApproved: (args: ApproveType) => Promise<boolean>;
    approve: (args: ApproveType) => EthereumTransactionTypeExtended;
}
export declare type ApproveType = {
    user: tEthereumAddress;
    token: tEthereumAddress;
    spender: tEthereumAddress;
    amount: string;
};
export declare type TokenMetadataType = {
    name: string;
    symbol: string;
    decimals: number;
    address: string;
};
export declare class ERC20Service extends BaseService<IERC20Detailed> implements IERC20ServiceInterface {
    readonly tokenDecimals: Record<string, number>;
    readonly tokenMetadata: Record<string, TokenMetadataType>;
    constructor(provider: providers.Provider);
    approve({ user, token, spender, amount }: ApproveType): EthereumTransactionTypeExtended;
    isApproved({ user, token, spender, amount }: ApproveType): Promise<boolean>;
    decimalsOf(token: tEthereumAddress): Promise<number>;
    getTokenData(token: tEthereumAddress): Promise<TokenMetadataType>;
}
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