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/** * Utility function for conditional class names * Optimized for performance and TypeScript support */ type ClassName = string | number | boolean | undefined | null; type ClassValue = ClassName | ClassValue[] | Record<string, boolean | undefined | null>; function toVal(mix: ClassValue): string { let str = ''; if (typeof mix === 'string' || typeof mix === 'number') { str += mix; } else if (typeof mix === 'object') { if (Array.isArray(mix)) { for (let i = 0; i < mix.length; i++) { if (mix[i]) { const val = toVal(mix[i]); if (val) { str && (str += ' '); str += val; } } } } else { for (const key in mix) { if (mix[key]) { str && (str += ' '); str += key; } } } } return str; } export function cn(...inputs: ClassValue[]): string { let i = 0; let tmp: string; let str = ''; const len = inputs.length; for (; i < len; i++) { tmp = toVal(inputs[i]); if (tmp) { str && (str += ' '); str += tmp; } } return str; } export default cn;