Background

Chrome Extensions use a service worker to listen for Chrome API Events in the background.

Add a service worker to your extension in the manifest under background.service_worker. CRXJS uses module-type service workers because Vite uses the ES module format.

manifest.json
{
  "background": {
    "service_worker": "src/background.ts",
    "type": "module"
  }
}

CRXJS loads the service worker from the Vite Dev Server during development, and HMR causes a full extension reload when Vite detects a change to the background code.

Learn more about extension service workers in the Chrome Developer Docs.

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Pages
The manifest can declare the most common pages, such as the action popup and the options page, but not every extension page has a place in the manifest.
Content Scripts
CRXJS provides content scripts with Vite HMR.