vue-snotify not working when project is loading through RequireJS

[flytomek]

I generated new Vue.JS project using vue-cli and installed vue-snotify. I built project using

vue build --target lib --name myLib src/main.js

and loaded scripts using RequireJS

    <script>
        require(["Vue"], function (Vue) {
                window.Vue = Vue;
            console.log(Vue, 'Vue loaded');
            require(["myLib"], function (widget) {
                console.log('myLib loaded');
            });
        });
    </script>

However I got this error:
Uncaught TypeError: Cannot read property 'extend' of undefined
which leads me to this piece of code:

var script = external_commonjs_vue_commonjs2_vue_root_Vue_default.a.extend({
    props: ['toast'],
    data: function () {
        return {
            isPromptFocused: false,
        };
    },
    methods: {
        valueChanged: function (e) {
            this.toast.value = e.target.value;
            this.toast.eventEmitter.$emit('input');
        }
    }
});

Loading scripts directly thorugh script tag works fine, problem is where I'm using RequireJS.