/**
 * Normalize a raw Telegram social value into a bare handle.
 * Trims surrounding whitespace, strips URL prefixes (t.me, telegram.me),
 * strips @ prefix, and strips query/hash/path suffixes.
 * Returns null if the result is not a valid Telegram handle (5-32 alphanumeric/underscore chars).
 */
export declare function normalizeTelegramHandle(raw: string | null | undefined): string | null;