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if they are both from javascript then you can use them both in different files by changing the script language.
to learn more about vue:
https://v2.vuejs.org/v2/guide/
to learn more about p5.js:
https://p5js.org/reference/
to learn more about changing script with the script tag:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script
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You can either add the CDN link in the index.html or you could use the yarn package (it seems to be up to date).
yarn add p5
Source:stackexchange.com