/**
 * Determines the week number of the current or specified date (ISO 8601 = the week with the starting year's first Thursday in it)
 * @param {Date} [date] Optional date which the week number is to be returned. If no date is specified, the current date is used.
 * @return {number} Returns the week number of current or specified date
 * @since 1.2.0
 */
export default function weekNumber(date?: Date): number;
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