/**
 * Compares two strings using locale-aware collation rules.
 *
 * @param a - The first string to compare.
 * @param b - The second string to compare.
 * @param locale - BCP 47 locale tag used for collation (defaults to "en").
 * @param sensitivity - Controls how differences in case/diacritics are handled.
 * @returns A negative number if `a` sorts before `b`, positive if after, or 0 if equal.
 *
 * Special behavior: Uses `Intl.Collator`, which provides Unicode-aware comparison.
 */
export declare function localeCompare(a: string, b: string, locale?: string, sensitivity?: Intl.CollatorOptions["sensitivity"]): number;
/**
 * Normalizes a string to the specified Unicode normalization form.
 *
 * @param input - The string to normalize.
 * @param form - The Unicode normalization form (NFC, NFD, NFKC, or NFKD).
 * @returns The normalized string.
 *
 * Special behavior: Preserves Unicode text while normalizing code point sequences.
 */
export declare function normalizeUnicode(input: string, form?: "NFC" | "NFD" | "NFKC" | "NFKD"): string;
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