It sounds like you're having issues with handling dependencies in your Vite.js monorepo. If I understand correctly, you have three types of packages - core, theme, and specific app - each with their own dependencies and common dependencies defined as peerDependencies. You've excluded the peerDependencies by listing them in the external option of vite/rollup, and you've tried to load the required bundles using a script tag injected in the browser, but the dependencies are not exposed for every bundle to use them. One solution to this issue is to use a module bundler like webpack instead of Vite.js. Webpack allows you to define external dependencies for each bundle using the externals option in the configuration file. This will let you load required bundles in the browser and have access to the globally defined dependencies. Another solution is to use the script tag approach you've attempted, but with some modifications. Instead of injecting a script tag for each bundle, you can inject a single script tag that loads all the required bundles in the correct order. You can define the dependencies for each bundle in the order they need to be loaded, and then load the bundles using a single script tag. This will ensure that all the dependencies are exposed globally and can be used by every bundle. Either of these solutions should help you manage your dependencies and load the required bundles in the browser.