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The error here
“ReferenceError: [Insert anything here] not defined”
Means that whatever you’re trying to reference hasn’t been defined and the browser engine does not recognize it as a native object
Swiper is not something Chrome or Firefox are born with
Try removing the VueJS CDN link on the top of your page and you’ll get the same error for vue, so….
Include the Swiper library like you did with Vue
<script src="https://cdnjs.cloudflare.com/ajax/libs/Swiper/4.5.1/js/swiper.min.js" integrity="sha256-4sETKhh3aSyi6NRiA+qunPaTawqSMDQca/xLWu27Hg4=" crossorigin="anonymous"></script>
Here’s where Swiper variable is defined if you’re curious
Source:stackexchange.com