yii2-notifyjs-widget

http://notifyjs.com/
https://github.com/notifyjs/notifyjs

composer.json

"require": {
    "xj/yii2-notifyjs-widget": "~1.0"
},

Assets

//Base Assets
xj\notifyjs\NotifyjsAsset::register($this);

//Themes Assets
xj\notifyjs\themes\MetroAsset::register($this);

Note

//bootstrap theme include in notify.js, you can direct use it.
//see source
https://github.com/jpillora/notifyjs/blob/0b8891e/dist/notify.js#L531-L571