import { type PublicPricingSnapshot } from "../skill-bench/telemetry.js";
/** 1 AI credit = 1e9 nano-AIU (same conversion as skill-bench). */
export declare const NANO_AIU_PER_CREDIT = 1000000000;
/** 1 AI credit = $0.01 USD → $ = nano / 1e11. */
export declare const NANO_AIU_PER_USD = 100000000000;
export declare const ESTIMATE_DISCLAIMER = "estimate only; not a provider invoice; session-level-only (not per-skill)";
export interface ModelUsageRow {
    model: string;
    inputTokens?: number;
    outputTokens?: number;
    cacheReadTokens?: number;
    cacheWriteTokens?: number;
    totalNanoAiu?: number;
    aiCredits?: number;
    estimatedUsdFromCredits?: number;
    estimatedUsdFromPublicRates?: number;
}
export interface HistorySpendEstimates {
    source: "session-shutdown-nano-aiu" | "session-shutdown-nano-aiu+public-pricing";
    aiCredits?: number;
    estimatedUsdFromCredits?: number;
    byModel: ModelUsageRow[];
    pricing?: {
        attempted: boolean;
        matchedModels: string[];
        unresolvedModels: string[];
        sourceUrl?: string;
        retrievedAt?: string;
    };
    disclaimer: string;
}
export declare function nanoAiuToAiCredits(totalNanoAiu: number): number;
export declare function nanoAiuToUsd(totalNanoAiu: number): number;
export declare function creditEstimatesFromNanoAiu(totalNanoAiu: number | undefined): Pick<HistorySpendEstimates, "aiCredits" | "estimatedUsdFromCredits">;
export declare function enrichModelRow(row: ModelUsageRow): ModelUsageRow;
export declare function buildSpendEstimates(options: {
    totalNanoAiu?: number;
    byModel: ModelUsageRow[];
    publicPricing?: PublicPricingSnapshot | null;
}): HistorySpendEstimates;