I'm a sorta newer in this field, so please don't blame for such question..
I'm trying to add this library to my project and don't really undestand why it's not working.
The next is part of my attempts:

<script src="/sitelet?url=https%3A%2F%2Funpkg.com%2Freact%4016%2Fumd%2Freact.development.js" crossorigin></script>
<script src="/sitelet?url=https%3A%2F%2Funpkg.com%2Freact-dom%4016%2Fumd%2Freact-dom.development.js" crossorigin></script>
</head>
    <body>
        <script>
        import React from 'react'
        import MaskedInput from 'react-text-mask'
        export default () => (
        <div>
            <MaskedInput
            mask={['(', /[1-9]/, /\d/, /\d/, ')', ' ', /\d/, /\d/, /\d/, '-', /\d/, /\d/, /\d/, /\d/]}
            />
        </div>
        )
        </script>
        <div>
            <MaskedInput mask="+7 (999) 999-99-99"/>
        </div> 

That's all what connected with text-mask and ReacJS here. I used npm to download the Text-mask. Also Google Chrome's console said: "Cannot use import statement outside a module" on my "import React from 'react'". Curious where i'm stuck..