I know what these files contain like build contains the minified file which is minified from src file. I need to know how browser works with it. I haven’t uploaded my build file to hosting service yet my website got rendered. In the website, <script> SRC was linked to build but there was no build uploaded but a build was created automatically. this behaviour was observed in svelte. But I hope all framework does the same.
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Answer
From the Vercel documentation found here https://vercel.com/docs/build-step “Vercel tries to automatically detect the frontend framework you’re using for your project and configure the project settings for you. If you’d like to override the settings or specify a different framework, you can do so from the Build & Development Settings section.” So Vercel did automatically make a build folder for you. This is ok, because you should always use npm run build to create your build folder and point your hosting to use this folder for production.