function camelToSnake(str: string): string {
  return str.replace(/[A-Z]/g, letter => `_${letter.toLowerCase()}`);
}

function snakeToCamel(str: string): string {
  return str.replace(/(_[\w])/g, (match) => 
    match[1].toUpperCase()
  );
}

export function convertKeysFromSnakeToCamel<T>(obj: T): T {
  if (Array.isArray(obj)) {
    return obj.map(convertKeysFromSnakeToCamel) as unknown as T;
  } else if (obj !== null && typeof obj === 'object') {
    return Object.keys(obj).reduce((acc, key) => {
      const newKey = snakeToCamel(key);
      acc[newKey] = convertKeysFromSnakeToCamel((obj as any)[key]);
      return acc;
    }, {} as any);
  }
  return obj;
}


export function convertKeysFromCamelToSnake<T>(obj: T): T {
  if (Array.isArray(obj)) {
    return obj.map(convertKeysFromCamelToSnake) as unknown as T;
  } else if (obj !== null && typeof obj === 'object') {
    return Object.keys(obj).reduce((acc, key) => {
      const newKey = camelToSnake(key);
      acc[newKey] = convertKeysFromCamelToSnake((obj as any)[key]);
      return acc;
    }, {} as any);
  }
  return obj;
}