import type { MeteringDay } from './session-metering.js';
import { type PricingConfig } from './pricing.js';
export interface DayRange {
    from: string;
    to: string;
}
/** The outcome of reading `from`/`to` off a request.
 *
 *  `fullRangeFallback` separates the two ways `range` comes back null, which
 *  are NOT the same event:
 *
 *    - false — no range was asked for (the All time preset). Legitimate, and
 *              the figures are honestly labelled all-time.
 *    - true  — a range WAS asked for and could not be honoured. This is the
 *              most misleading state available, because the page then shows
 *              all-time figures under a bounded heading. */
export interface ParsedRange {
    range: DayRange | null;
    fullRangeFallback: boolean;
}
export declare function parseDayRange(from: unknown, to: unknown): ParsedRange;
export interface RangeSlice {
    activeMs: number;
    tokens: number;
    costGBP: {
        opus: number;
        sonnet: number;
    };
    /** Days falling inside the range. 0 is a real answer — a quiet month — and is
     *  what the caller reports as an empty slice. */
    matchedDays: number;
}
/** Sum a session's day rows over an inclusive range. A null range means every
 *  day.
 *
 *  Cost is re-derived from the SUMMED tokens rather than summed from the
 *  per-day costs, matching how computeMetering derives its own totals — adding
 *  already-rounded figures compounds their rounding. */
export declare function sliceMeteringDays(days: MeteringDay[], range: DayRange | null, cfg?: PricingConfig): RangeSlice;
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