/**
 * Content Moderator
 * Provides content moderation, PII detection, and toxicity filtering
 */
import { ModerationResult, ModerationConfig, ModerationStats } from './types';
export declare class ContentModerator {
    private config;
    private stats;
    private piiPatterns;
    private toxicKeywords;
    constructor(config: ModerationConfig);
    /**
     * Moderate content
     */
    moderate(content: string): Promise<ModerationResult>;
    /**
     * Check for harmful content categories
     */
    private checkHarmfulContent;
    /**
     * Check specific category
     */
    private checkCategory;
    /**
     * Calculate severity based on category and match count
     */
    private calculateSeverity;
    /**
     * Detect PII in content
     */
    private detectPII;
    /**
     * Get PII confidence score
     */
    private getPIIConfidence;
    /**
     * Redact PII from content
     */
    private redactPII;
    /**
     * Check toxicity (simplified - real implementation would use ML models like Perspective API)
     */
    private checkToxicity;
    /**
     * Convert toxicity scores to flags
     */
    private toxicityToFlags;
    /**
     * Apply custom moderation rules
     */
    private applyCustomRules;
    /**
     * Determine overall action based on flags
     */
    private determineAction;
    /**
     * Get moderation statistics
     */
    getStats(): ModerationStats;
    /**
     * Reset statistics
     */
    resetStats(): void;
    /**
     * Add custom PII pattern
     */
    addCustomPIIPattern(name: string, pattern: RegExp): void;
    /**
     * Add toxic keyword
     */
    addToxicKeyword(keyword: string): void;
}
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