/**
 * Privacy Filter
 *
 * Applies privacy rules to conversation content
 * Features: keyword matching, pattern matching, redaction, blocking
 */
import { ConversationMessage, PrivacyRule } from './types';
/**
 * Default Privacy Rules
 * Comprehensive set of rules for common sensitive patterns
 */
export declare const DEFAULT_PRIVACY_RULES: PrivacyRule[];
/**
 * Privacy Filter
 * Applies privacy rules to conversation content
 */
export declare class PrivacyFilter {
    private rules;
    private stats;
    constructor(rules?: PrivacyRule[]);
    /**
     * Apply privacy filters to message
     */
    filterMessage(message: ConversationMessage): Promise<ConversationMessage>;
    /**
     * Check if content should be blocked entirely
     */
    shouldBlock(content: string): boolean;
    /**
     * Add custom privacy rule
     */
    addRule(rule: PrivacyRule): void;
    /**
     * Remove privacy rule by description
     */
    removeRule(description: string): boolean;
    /**
     * Enable/disable rule by description
     */
    toggleRule(description: string, enabled: boolean): boolean;
    /**
     * Get all privacy rules
     */
    getRules(): PrivacyRule[];
    /**
     * Get filtering statistics
     */
    getStats(): {
        rulesApplied: {
            [k: string]: number;
        };
        messagesFiltered: number;
        messagesRedacted: number;
        messagesBlocked: number;
    };
    /**
     * Reset statistics
     */
    resetStats(): void;
    /**
     * Apply individual rule to content
     */
    private applyRule;
    /**
     * Get regex pattern from rule
     */
    private getPattern;
    /**
     * Check if rule is enabled
     */
    private isRuleEnabled;
    /**
     * Increment rule application count
     */
    private incrementRuleCount;
}
/**
 * Validate privacy rule
 */
export declare function validatePrivacyRule(rule: PrivacyRule): boolean;
/**
 * Create privacy rule from configuration
 */
export declare function createPrivacyRule(type: 'keyword' | 'pattern' | 'file_path', pattern: string | RegExp, action: 'filter' | 'redact' | 'block', description: string): PrivacyRule;
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