/**
 * LLM Usage Tracker Implementation.
 *
 * Append-only JSON log of LLM usage records stored in `.lisa/llm-usage.json`.
 * Provides cost aggregation and monthly budget enforcement.
 *
 * Part of Phase 6B: Cost/Privacy Controls.
 */
import type { ILlmUsageTracker } from '../../domain/interfaces/ILlmUsageTracker';
import type { IPreferenceStore } from '../../domain/interfaces/IPreferenceStore';
import type { ILogger } from '../../domain/interfaces/ILogger';
import type { LlmProvider } from '../../domain/interfaces/ILlmService';
/**
 * Estimate cost for a usage event.
 */
export declare function estimateCost(provider: LlmProvider, inputTokens: number, outputTokens: number): number;
/**
 * Create an LLM usage tracker.
 *
 * @param projectRoot - Project root directory (location of `.lisa/`)
 * @param preferenceStore - Preference store for reading budget limits
 * @param logger - Optional logger
 */
export declare function createLlmUsageTracker(projectRoot: string, preferenceStore: IPreferenceStore, logger?: ILogger): ILlmUsageTracker;
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