import type { EntryCta } from '@funkit/connect-core';
/** Where the one-time code is sent, which decides keyboard and copy. */
export type ContactKind = 'PHONE' | 'EMAIL';
export interface SessionContactField {
    /** The transition's own input name — the key the answer is sent back under. */
    name: string;
    kind: ContactKind;
    /** The server's pattern for the value, when it declares one. */
    regex?: string;
}
/**
 * Every value the session-opening transition asks the user for, in the order
 * it declares them.
 *
 * All of them: a step that wants a number *and* an address verifies each on a
 * round of its own, and collecting only the first opens a session the server
 * cannot finish. The name is the body key, so gating on a known name is how
 * the client stops sending a field the server asked for.
 */
export declare function sessionContactFields(entry: EntryCta): readonly SessionContactField[];
export declare function isUnfamiliarContactName(name: string): boolean;
/**
 * Nothing opens the session until every field it declares is answered.
 * `region` is the buyer's country, so a number typed the way they dial it at
 * home counts once it can be read as one.
 */
export declare function areContactsComplete(fields: readonly SessionContactField[], values: Readonly<Record<string, string>>, region?: string): boolean;
/**
 * A number has to be one the world's numbering plans actually contain — the
 * right length for its country and a leading digit its country hands out —
 * since `/fiat/*` refuses anything else on any route and the code it sends
 * would otherwise go nowhere. A pattern the step declares narrows that further;
 * it never widens it.
 */
export declare function isCompleteContact(field: SessionContactField, value: string, region?: string): boolean;
/**
 * The value as the step sends it: a number in E.164, however it was typed, and
 * an address trimmed. What could not be read as a number goes as typed, so the
 * server's own refusal names it rather than a silently altered value.
 */
export declare function normalizeContact(field: SessionContactField, value: string, region?: string): string;
/**
 * Deliberately loose — a stricter pattern rejects addresses that are perfectly
 * valid.
 */
export declare function looksLikeEmail(value: string): boolean;
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