/**
 * Removes extra whitespace in class strings.
 * @param {string} classString The string to be trimmed
 * @returns {string} Clean class string
 */
export function stripClassWhitespace(classString: string): string;
/**
 * Filters out falsy classes.
 * @param {...(string | false | null)} args The classes to be filtered
 * @return {string} The classes without the falsy values
 */
export default function classes(...args: (string | false | null)[]): string;
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