fix: setup error on windows

[Minecraftschurli]

What does it do?

Fixed the error when running yarn setup on windows (#996)

Why is it needed?

Setting up the project on windows was broken

How to test it?

Run the setup script on windows (and other os)

Related issue(s)/PR(s)

fixes #996

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[joshuaellis]

I'm not sure about changing the external function so much – could we not just change:

external: (id) => !id.startsWith('.') && !id.startsWith('/'), 

to

external: (id) => !id.startsWith('.') && !id.startsWith(path.sep),

would that work instead? 🤔

[joshuaellis]

closing due to inactivity.