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WXT Virtual Entrypoints
This folder contains scripts that are either loaded as entrypoints to JS files or included in HTML files, just like a project using WXT might load their own scripts.
While they are bundled and shipped inside WXT, Vite considers them apart of your project's source code, not WXT's. This means they cannot import 3rd party modules directly, otherwise pnpm i --shamefully-hoist=false and Yarn PnP will fail.
For this reason, the virtual entrypoints get their own TS project to isolate them from the rest of the project. They can only import from wxt/* or utils that don't have any imports from node_modules, like the logger.
When bundling WXT for publishing to NPM, all the wxt/* imports are marked as external and resolved when building your application. Other imports are added inline.
See https://github.com/wxt-dev/wxt/issues/286#issuecomment-1858888390 for more details.