type ClassValue = string | number | boolean | undefined | null;
type ClassArray = ClassValue[];
type ClassObject = { [key: string]: any };
type ClassInput = ClassValue | ClassArray | ClassObject;

export function cn(...inputs: ClassInput[]): string {
  const classes = [];
  
  for (const input of inputs) {
    if (!input) continue;
    
    if (typeof input === 'string') {
      classes.push(input);
    } else if (Array.isArray(input)) {
      classes.push(cn(...input));
    } else if (typeof input === 'object') {
      for (const key in input) {
        if (input[key]) {
          classes.push(key);
        }
      }
    }
  }
  
  return classes.join(' ');
}