How to get form data? for antd form form

if (newOptions.method = "POST" | | newOptions.method = "PUT") {

if (!(newOptions.body instanceof FormData)) {
  newOptions.headers = {
    Accept: "application/json",
    "Content-Type": "application/json; charset=utf-8",
    ...newOptions.headers
  };
  newOptions.body = JSON.stringify(newOptions.body);
} else {
  // newOptions.body is FormData
  newOptions.headers = {
    Accept: "application/json",
    ...newOptions.headers
  };
}

In the code example of

}
antd pro, there is a judgment about FormData
this.props.form.validateFields ((err, values) = > {})
values is a json object.
how to become FormData?

this.props.form.validateFields((err, values) => { if (!err) { const data = new URLSearchParams(values); } }) if (newOptions.method === "POST" || newOptions.method === "PUT") { if (!(newOptions.body instanceof FormData) && !(newOptions.body instanceof URLSearchParams)) { newOptions.headers = { Accept: "application/json", "Content-Type": "application/json; charset=utf-8", ...newOptions.headers }; newOptions.body = JSON.stringify(newOptions.body); } else { // newOptions.body is FormData newOptions.headers = { Accept: "application/json", "Content-Type": "application/x-www-form-urlencoded;charset=utf-8", ...newOptions.headers }; }