/** Strip leading whitespace; preserve trailing so the user can keep typing. */
export declare const trimLeading: (value: string) => string;
/**
 * Keep only digits, optionally capped to `max` characters. Useful for fields
 * whose validators are digit-only (AU postal codes, ownership %, etc.).
 */
export declare const digitsOnly: (max?: number) => (value: string) => string;
/**
 * US ZIP filter: keep digits, spaces, and hyphens (so users can type
 * `12345-6789` naturally) and trim leading whitespace. The trim runs after
 * the character filter so letters preceding a space don't strand the
 * space (e.g. `"abc 12-345"` → `"12-345"`, not `" 12-345"`).
 */
export declare const usZipFilter: (value: string) => string;
/**
 * Foreign-TIN normalizer used by every foreign-TIN field (account holder,
 * regarded owner, per-residency). AU is 11 digits, US is digits-only;
 * everything else uppercases for canonical display.
 */
export declare const normalizeForeignTin: (value: string, country: string | undefined) => string;