import * as z from "zod";
export declare const DownloadPeriod: z.ZodUnion<readonly [z.ZodLiteral<"last-day" | "last-week" | "last-month" | "last-year">, z.ZodString]>;
/**
`DownloadPeriod` represents a time period for which downloads should be counted.

The following time periods are supported by npm:
- `last-day` - Last day available, not necessarily yesterday.
- `last-week` - Last seven days available.
- `last-month` - Last 30 days available.
- `last-year` - Last 365 days available.
- `YYYY-MM-DD` - Date in the format `YYYY-MM-DD`.
- `YYYY-MM-DD:YYYY-MM-DD` - Inclusive date range in the format `YYYY-MM-DD:YYYY-MM-DD`.

@see {@link https://github.com/npm/registry/blob/master/docs/download-counts.md}
 */
export type DownloadPeriod = 
/** Last day available, not necessarily yesterday. */
"last-day"
/** Last seven days available. */
 | "last-week"
/** Last 30 days available. */
 | "last-month"
/** Last 365 days available. */
 | "last-year"
/** Date in the format `YYYY-MM-DD`. */
 | `${number}-${number}-${number}`
/** Inclusive date range in the format `YYYY-MM-DD:YYYY-MM-DD`. */
 | `${number}-${number}-${number}:${number}-${number}-${number}`;