function reject( xhr, err, headers ) {
	const e = new ProgressEvent( 'error' );
	e.error = e.err = err;
	e.headers = headers;
	xhr.dispatchEvent( e );
}
function reject( xhr, err, headers ) {
	const e = new ProgressEvent( 'error' );
	e.error = e.err = err;
	e.headers = headers;
	xhr.dispatchEvent( e );
}
function reject ( xhr , err , headers ) { const e = new ProgressEvent ( 'error' ) ; e . error = e . err = err ; e . headers = headers ; xhr . dispatchEvent ( e ) ; }
Emits the "error" event on the `xhr`.

@param {XMLHttpRequest} xhr
@param {Error} err
@private
Emits the error event on the xhr .