export interface LifetimeTokenRecord {
    totalSavedTokens: number;
    totalGrossInputTokens: number;
    totalCompressedTokens: number;
    totalRuns: number;
    lastUpdatedAt: number;
}
export declare function readLifetimeTokens(stateDir?: string): LifetimeTokenRecord;
export declare function accumulateLifetimeTokens(delta: {
    savedTokens: number;
    grossInputTokens: number;
    compressedTokens: number;
}, stateDir?: string): LifetimeTokenRecord;
