/**
 * Converts characters like ĖČĘĄ -> ecea, removes non letter and non number characters
 * @param str the string
 * @signature
 *    P.normalizeString(str);
 * @example
 *    P.normalizeString("Super#@! ===-0- ball %%% cup") // => super0ballcup
 * @data_first
 * @category String
 */
export declare function normalizeString(str: string): string;
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