/**
 * Extract a valid timezone name from a string.
 *
 * @throws {RangeError} No valid timezone found in string
 *
 * @category Timezones
 * @see {@link https://en.wikipedia.org/wiki/Tz_database#Names_of_time_zones | Timezone name format on Wikipedia}
 */
export declare function parseTimezone(timezoneString: string): string;
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