/**
 * Server-side period resolution for the prompt runbooks (issue #260).
 *
 * The prompts used to hand the model a relative phrase — "cette semaine",
 * "le mois en cours", "aujourd'hui (D) → D+H" — and let it work out the ISO
 * bounds. The server knows the date; the model regularly got a week boundary
 * or a month end wrong, and every mistake silently shifted the whole runbook.
 * Resolving here means the bounds are computed once, deterministically, and
 * appear in the runbook as literal `YYYY-MM-DD` values the model only copies.
 *
 * Dates are computed in the server's local calendar (the `Date` getters, not
 * UTC): a runbook is read by a person whose "today" is the server's day.
 */
export interface PeriodBounds {
    /** Inclusive first day, `YYYY-MM-DD`. */
    startDate: string;
    /** Inclusive last day, `YYYY-MM-DD`. */
    endDate: string;
    /** First month covered, `YYYY-MM` (for the `startMonth` / `endMonth` filters). */
    startMonth: string;
    /** Last month covered, `YYYY-MM`. */
    endMonth: string;
    /** Human wording of what was resolved, for the runbook's first line. */
    label: string;
}
export type PeriodKind = "week" | "month";
/** `YYYY-MM-DD` of a local date. */
export declare function toIsoDate(d: Date): string;
/** `YYYY-MM` of a local date. */
export declare function toIsoMonth(d: Date): string;
/** A new local date `days` after `d` (midnight, DST-safe through setDate). */
export declare function addDays(d: Date, days: number): Date;
/**
 * Resolve a period argument to ISO bounds.
 *
 * Understood: nothing (→ the current `defaultKind`), "cette semaine" /
 * "semaine en cours" / "this week", "semaine dernière" / "la semaine passée",
 * "semaine prochaine", "ce mois" / "mois en cours" / "ce mois-ci", "mois
 * dernier", "mois prochain", `YYYY-MM`, `YYYY-Www` (ISO week), a French month
 * name with a year ("avril 2026"), and a `YYYY-MM-DD..YYYY-MM-DD` range.
 * Anything else returns `null`: the runbook then keeps the caller's wording
 * and tells the model today's date, so it still has an anchor.
 */
export declare function periodBounds(arg: string | undefined, now: Date, defaultKind: PeriodKind): PeriodBounds | null;
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