/**
 * Returns the ISO week number of the provided date (1-53).
 *
 * @param date Date to get the week number of.
 * @returns The week number of the provided date.
 *
 * @example Basic usage
 * ```ts
 * import { weekOfYear } from "@std/datetime/week-of-year";
 * import { assertEquals } from "@std/assert";
 *
 * assertEquals(weekOfYear(new Date("2020-12-28T03:24:00")), 53);
 *
 * assertEquals(weekOfYear(new Date("2020-07-10T03:24:00")), 28);
 * ```
 */
export declare function weekOfYear(date: Date): number;
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