import type { Message } from '../core/types';
export interface UserProfile {
    preferences: Record<string, string>;
    communication_style: string;
    expertise_areas: string[];
    common_requests: string[];
    last_updated: number;
}
/**
 * DeepBrain-powered user profiling from conversation signals.
 */
export declare class UserProfiler {
    private observationCount;
    private signals;
    private readonly LEARN_INTERVAL;
    /**
     * Detect language mix of a text.
     */
    private detectLanguage;
    /**
     * Detect technical level from content.
     */
    private detectTechLevel;
    /**
     * Detect communication style.
     */
    private detectStyle;
    /**
     * Extract domain keywords.
     */
    private extractDomainKeywords;
    /**
     * Classify request type.
     */
    private classifyRequest;
    /**
     * Observe a user message and accumulate profile signals.
     */
    observe(message: Message, brain?: any): Promise<void>;
    private buildProfileFromSignals;
    /**
     * Get user profile, optionally from brain recall.
     */
    getProfile(brain?: any): Promise<UserProfile>;
    /**
     * Enhance a system prompt with user profile context.
     */
    enhance(systemPrompt: string, profile: UserProfile): string;
    /**
     * Generate USER.md content from the current profile.
     */
    toMarkdown(profile: UserProfile): string;
    /**
     * Save USER.md to the given directory.
     */
    saveUserMd(dir: string, profile?: UserProfile): Promise<void>;
}
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