/**
 * IBAN content detector — deterministic, checksummed, not overridable.
 *
 * Column policy (`maskColumns: ['*.iban']`) only fires when the column is
 * named. A free-text note, or a column the operator forgot to list, used to
 * send the IBAN to the model — sometimes half-masked by the digit detector
 * (`TR00000000000[MASKED_PII]`), which looks like protection and is worse
 * than leaving it alone.
 *
 * A profile may empty `maskColumns`. It must not switch this off: identity
 * fields are not a privilege the controller can grant the model.
 *
 * Checksum (ISO 7064 mod-97-10) is the false-positive brake. Shape alone
 * would mask any 15–34 character alphanumeric run that starts with two
 * letters; the remainder-1 test is what refuses a random 26-digit string.
 * Tests that disable the checksum MUST go red if this brake is removed.
 *
 * The candidate regex is greedy and will eat the next word (`havale IBAN
 * tamam`). After a match we shrink from the end until the remainder is a
 * real IBAN (or an IBAN-shaped lookalike). Lookalikes that fail checksum
 * are not masked — they are shielded so the phone/card regexes cannot
 * nibble the tail.
 */
export declare const IBAN_MASK: '[MASKED_PII]';
/** Strip grouping spaces/hyphens; IBAN letters are case-insensitive. */
export declare function normalizeIban(raw: string): string;
/**
 * ISO 13616 electronic form: 2-letter country, 2 check digits, 11–30 BBAN.
 * Country-specific lengths are not a dictionary we maintain — checksum is
 * the acceptance test.
 */
export declare function looksLikeIban(normalized: string): boolean;
/**
 * ISO 7064 MOD-97-10 over the rearranged IBAN.
 * Remainder must be 1. A candidate that fails this is not an IBAN.
 */
export declare function ibanMod97Ok(normalized: string): boolean;
export interface MaskIbanOpts {
    /** Production default true. Tests flip this to prove the brake exists. */
    checksum?: boolean;
}
export interface IbanPass {
    text: string;
    count: number;
    restore: (s: string) => string;
}
/**
 * Mask checksum-valid IBANs; shield remaining IBAN-shaped spans so later
 * digit detectors cannot half-mask them. Call `restore` after those detectors.
 */
export declare function prepareIbanPass(text: string, opts?: MaskIbanOpts): IbanPass;
export declare function maskIbansInText(text: string, opts?: MaskIbanOpts): {
    text: string;
    count: number;
};
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