lucide/packages/shared/src/utils/mergeClasses.ts

/**
 * Merges classes into a single string
 *
 * @param {array} classes
 * @returns {string} A string of classes
 */
export const mergeClasses = <ClassType = string | undefined | null>(...classes: ClassType[]) =>
  classes
    .filter((className, index, array) => {
      return (
        Boolean(className) &&
        (className as string).trim() !== '' &&
        array.indexOf(className) === index
      );
    })
    .join(' ')
    .trim();