How to know whether a field in zod schema is optional or not? #405

[hckhanh]

Can I get information about the field in zod schema, I want to know if the field is required or not

export const phoneSchema = object({
  phone: string().refine(
    (phone) => isMobilePhone(phone, "vi-VN"),
    "Số điện thoại này không hợp lệ"
  ),
});

I want to know if the phone is required or not in the code