export interface SessionMetric {
    command: string;
    project: string;
    inputTokens: number;
    outputTokens: number;
    turns: number;
    costUSD: number;
    durationMs: number;
    timestamp: string;
}
export declare function ensureMetricsFile(): void;
export declare function saveSessionMetric(metric: SessionMetric): void;
export declare function loadSessionMetrics(): SessionMetric[];
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