FormData
open external class FormData(form: EventTarget = definedExternally, submitter: EventTarget? = definedExternally) : MapLike<String, FormDataEntryValue> (source)
Provides a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using the XMLHttpRequest.send() method. It uses the same format a form would use if the encoding type were set to "multipart/form-data".