export interface UsageInfo {
    input: number;
    output: number;
    cacheRead: number;
    cacheWrite: number;
    /** Dollars, as pi prices it (notional for a subscription). */
    cost: number;
    /** The part of `cost` since local midnight (when the worker last counted). */
    today: number;
    /** Local midnight (ms epoch) of the day `today` is for. */
    day: number;
    /** Billed to a subscription (pi's "(sub)"): the cost is what it would be per token. */
    sub: boolean;
    /** Cost and tokens per model ("provider/id"), the largest few. */
    models: Record<string, {
        cost: number;
        tokens: number;
    }>;
}
/** Models kept per session in a report (the rest are summed under "other"). */
export declare const USAGE_MODELS = 8;
/** pi's bucket for usage no model is named for (tool results, summaries). */
export declare const SUMMARIES = "Tools/summaries";
export declare function localMidnight(now: number): number;
/** A session's usage from its entries (pi's sessionManager.getEntries()). */
export declare function sessionUsage(entries: readonly unknown[], now: number, sub: boolean): UsageInfo;
/** A UsageInfo from untrusted JSON (a report, state.json), or null. */
export declare function usageFrom(v: unknown): UsageInfo | null;
export declare function sameUsage(a: UsageInfo | null | undefined, b: UsageInfo | null | undefined): boolean;
/** Today's share as of `now`: none once the day it was counted for is over. */
export declare function todayOf(u: UsageInfo, now: number): number;
/** $0.42, $12.30, $1.2k: short enough for a row. */
export declare function formatCost(dollars: number): string;
export interface UsageTotals {
    cost: number;
    today: number;
    tokens: number;
    /** The part of cost billed to subscriptions (notional). */
    subCost: number;
    models: Record<string, {
        cost: number;
        tokens: number;
        sessions: number;
    }>;
}
/** M24: totals over rows (the agent view's header and /usage). */
export declare function totalUsage(rows: readonly {
    usage?: UsageInfo | null;
}[], now: number): UsageTotals;