import type { ContactKind } from './sessionContact';
/**
 * The number and the address the user has given, held past the round that
 * collected them.
 *
 * A session verifies one channel per round, and the reducer drops what was
 * collected once the round changes — so the code screen has nowhere else to
 * read the destination it names.
 */
export interface KnownContacts {
    phone?: string;
    email?: string;
}
/** Records one answer under the channel it can carry a code on. */
export declare function rememberContact(known: KnownContacts, kind: ContactKind, value: string): KnownContacts;
/** Where a round's code went, or `undefined` when the user never gave it. */
export declare function contactOnChannel(known: KnownContacts, isSms: boolean): string | undefined;
/**
 * Everything the client can name, the collected value over the host's.
 *
 * The email round goes to the address the host asserted for this user, and
 * `POST /fiat/session` never asks for one — so without the host's own value
 * the screen can only say "your email". Whatever the step did collect wins:
 * that is what actually opened the session.
 */
export declare function resolveContacts(hostEmail: string | undefined, collected: KnownContacts): KnownContacts;
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