Run npm ci
Run npm run dev and open the specified URL.
Observe that the cssInjectedByJsPlugin plugin has not run, and the
CSS is within the <head>.
Run npm run build and then open index-prod.html in your browser.
Observe that the custom injectCodeFunction (see vite.config.js) has run, the CSS
is within the shadow dom, and <head> is empty. The conditional logic for this
behaviour can be found in src/app/Widget.ts:
process.env.NODE_ENV === "production"
? this.attachShadow({ mode: "open" })
: this;