/**
 * Resolves `value` to a canonical tz-database zone name, matched case-insensitively,
 * or `null` when it is unset or not a known zone.
 *
 * @throws {TypeError} when `value` is an empty string, or is neither a string nor unset.
 */
export declare function canonicalTimezone(value?: string | null): string | null;
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