interface LinkSuggestion {
    type: 'email' | 'phone';
    maskedIdentifier?: string;
    reason: string;
}
/**
 * Fetch the "you may have a second account" nudge. Best-effort: any failure
 * (old backend, flag off, network) means no nudge — never breaks a sign-in.
 */
export declare function fetchLinkSuggestion(): Promise<LinkSuggestion | null>;
/** One dim line after sign-in when a link opportunity exists. TTY only. */
export declare function maybePrintLinkSuggestion(): Promise<void>;
export declare function accountLink(identifierArg?: string): Promise<void>;
export {};
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