/**
 * Redaction level formatter.
 *
 * Three modes:
 * - full:   fake values (current behavior, default)
 * - masked: partial masking (first 2 + *** + last 2)
 * - stats:  category placeholders like [HOSTNAME-1]
 */
import { Category } from "./types.js";
export type RedactionLevel = "full" | "masked" | "stats";
export declare class RedactionFormatter {
    private _counters;
    /**
     * Format a replacement value according to the redaction level.
     *
     * @param real     The real sensitive value
     * @param fake     The generated fake value (used in 'full' mode)
     * @param category The entity category
     * @param level    The redaction level
     */
    format(real: string, fake: string, category: Category, level: RedactionLevel): string;
    /** Reset counters (call between requests if needed). */
    resetCounters(): void;
    private _mask;
    private _placeholder;
}