import type { WithdrawalFlowConfig, WithdrawalSourceTokenParams } from '../flow/withdrawalFlowConfig';
type BalanceCallback = NonNullable<WithdrawalFlowConfig['withdrawalSourceTokenBalance']>;
/**
 * The host's source balance, whichever way it answers. A plain value is read
 * on render as before. A promise is awaited once per source token and the
 * balance reads as zero until it lands: the form must not offer a Max the
 * host has not confirmed. Undefined only when the host gave no callback.
 */
export declare function useWithdrawalSourceTokenBalance(callback: BalanceCallback | undefined, params: WithdrawalSourceTokenParams): string | undefined;
export {};
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