packages/0x.js/src/fetchers/balance_and_allowance_fetcher.ts


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

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