metadata is not NotificationMetadata format in Windows10

[blackbutton]

I use node-notifier in windows10, but NotificationCallback output metadata puzzle me。This is my code:
const notify = ({title, message}, cb) => {
notifier.notify(
{
title: title || "Unknown title",
message: message || "Unknown message",
sound: true,
actions: ['OK', 'Cancel'],
reply: true,
},
(err, response, metadata) => {
console.log(metadata);
cb(metadata);
});
};
=====================output
{
"action": "buttonClicked",
"notificationId": "14096",
"pipe": "\\.\pipe\notifierPipe-fa8bbb26-b562-4ad7-83b6-428f77bbaaa8",
"button": "OK",
"version": "0.7.0",
"activationType": "OK"
}
why not NotificationMetadata format
interface NotificationMetadata {
activationType?: string | undefined;
activationAt?: string | undefined;
deliveredAt?: string | undefined;
activationValue?: string | undefined;
activationValueIndex?: string | undefined;
}