import { CeloTokenContract } from '@celo/contractkit';
import { Connector, Network } from '../types';
export declare const loadPreviousConfig: (defaultNetworkProp: Network, defaultFeeCurrencyProp: CeloTokenContract, networks: Network[]) => {
    address: string | null;
    network: Network | null;
    connector: Connector;
    feeCurrency: CeloTokenContract | null;
};
export declare function clearPreviousConfig(): void;
export declare function isValidFeeCurrency(currency: string | null): boolean;
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