Using Paperjs:
By specifying type="text/paperscript" on your tag, you are loading your code as PaperScript rather than JavaScript.
This means that Paper.js will parse it first before passing it to the browser JavaScript engine.
In order to parse your code, Paper.js uses acorn, a parser library. And the version of acorn bundled with Paper.js doesn't support ES6 syntax.
What you can do to circumvent that, is loading a newer version of acorn (that supports ES6) before loading Paper.js.
This is actually what is done on the Paper.js playground: http://sketch.paperjs.org/
Here is a fiddle demonstrating the solution.
Note that I used https://unpkg.com to quickly load the latest versions of npm packages but you load them from wherever you want.
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