/**
 * Numeric PII — card / TCKN / phone — with the same class of fix IBAN got
 * in 0.2.2: never start a match in the middle of a longer digit run.
 *
 * The card regex `(?:\d[ -]*?){13,16}` plus a phone regex with no leading
 * `\b` would match 13 digits *inside* a 16-digit PAN and leave
 * `411[MASKED_PII]`. `maskedCount` then claimed the field was protected.
 * A leftover prefix glued to a mask is not protection.
 *
 * Decision, on a *maximal* digit run (grouping spaces/hyphens allowed):
 *   - 13–16 digits and Luhn holds → card, mask the whole run
 *   - 11 digits starting with 0 → TR national phone (0 + 10 digits:
 *     cep 05xx, sabit 02/03/04xx, 08xx). TCKN never starts with 0.
 *     The 2nd-digit 5-vs-2/3/4 split is numbering-plan identity, not a
 *     masking decision — 08xx would fall through it.
 *   - 11 digits starting 1–9 → TCKN-shaped, mask the whole run
 *   - 10 digits → phone-shaped (compact local, no trunk 0)
 *   - longer (20, 25, …) → not a card; the content scanner does not touch it
 * Formatted phones (`+90 555 123 4567`) are a separate pass that also
 * refuses to start or end next to a digit.
 */
export declare const PII_SCAN_CHAR_CAP = 16384;
/** Hard ceiling so an unbounded cap cannot become a DoS. */
export declare const PII_SCAN_CHAR_CAP_MAX = 1048576;
/**
 * Env wins, then policy, then the compiled default. Invalid env falls back
 * to default rather than disabling the cap.
 */
export declare function resolveScanCharCap(policyCap?: number): number;
export declare function luhnOk(digits: string): boolean;
export declare function maskNumericPii(text: string): {
    text: string;
    count: number;
};
/** Bounded email. Unbounded `{local}+@` backtracks O(n²) on a long
 *  alphanumeric field that contains no `@` (TR33+40k digits, 20k hex). */
export declare const EMAIL_RE: RegExp;
export declare function maskEmails(text: string): {
    text: string;
    count: number;
};
export declare function maskEntityEncodedEmails(text: string): {
    text: string;
    count: number;
};
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