Growl-js NPM | npm.io

Download & copy this package's "dist" folder into your web server's public folder eg. public/js/dist/*.
Rename "dist" to "growl" eg. public/js/growl
Load the growl script at the end of your web page (before the closing body tag) like this:

<body>
    ...

    <script src="/js/growl/growl.js"></script>
</body>
</html>

When the browser loads growl will be attached to the browser's global window object. Use it anywhere in your scripts like this:

<button>Target</button>

<script>
    document.querySelector('button').onclick = function(event) {
        growl({ message: 'You clicked on me' target: event.target });
    });
</script>

Then import and use it in your project's ES6 modules:

function helloWorld() { growl({ message: 'Hello World' }); }

Growl-js supports npm under the name growl-js.