packages/order-utils/src/abstract/abstract_balance_and_proxy_allowance_fetcher.ts


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import { BigNumber } from '@0xproject/utils';

export abstract class AbstractBalanceAndProxyAllowanceFetcher {
    public abstract async getBalanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
    public abstract async getProxyAllowanceAsync(assetData: string, userAddress: string): Promise<BigNumber>;
}