import type { Usage } from "@bastani/pi-ai/compat";
import type { SessionEntry } from "./session-manager.ts";
export interface UsageTotals {
    input: number;
    output: number;
    cacheRead: number;
    cacheWrite: number;
    cost: number;
}
export declare function createUsageTotals(): UsageTotals;
export declare function addUsageToTotals(totals: UsageTotals, usage: Usage): void;
/** Sum nested/classifier usage without losing optional token splits. */
export declare function combineUsage(first: Usage, second: Usage): Usage;
export interface UsageCostBreakdownEntry {
    key: string;
    cost: number;
    tokens: number;
}
export declare function getUsageCostBreakdown(entries: SessionEntry[]): UsageCostBreakdownEntry[];
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