/**
 * Trims the string, transforms it to lower case, and removes
 * {@link https://en.wikipedia.org/wiki/Combining_Diacritical_Marks | combining diacritical marks}
 * from it.
 *
 * @param string - The string to normalize.
 * @returns The normalized version of the string.
 * @public
 */
export declare function normalizeString(string: string | undefined): string;
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