export interface ModelUsage {
    inputTokens: number;
    outputTokens: number;
    cacheReadTokens: number;
    cacheWriteTokens: number;
    totalTokens: number;
    costUsd: number;
    requests: number;
}
export interface SessionCosts {
    totalCostUsd: number;
    totalInputTokens: number;
    totalOutputTokens: number;
    totalRequests: number;
    startTime: number;
    modelUsage: Record<string, ModelUsage>;
}
/**
 * Tracks token usage and cost per model across a session.
 * Mirrors Claude Code's cost-tracker pattern.
 */
export declare class CostTracker {
    private costs;
    constructor();
    add(model: string, usage: {
        inputTokens: number;
        outputTokens: number;
        cacheReadTokens?: number;
        cacheWriteTokens?: number;
        totalTokens?: number;
        costUsd?: number;
    }): void;
    get(): SessionCosts;
    reset(): void;
}