Run `yarn dev` to start the development server to test/develop the form standalone.
- This will generate a demo site on http://localhost:6173
- This will build and watch the production build and host it on http://localhost:6174/signup-form.min.js (different port!)
### Using the UMD build during development
Vite by default only supports HRM with an ESM output. But when loading a script on a site as a ESM module (`<scripttype="module"src="...">`), you don't have access to `document.currentScript` inside the script, which is required to determine the location to inject the iframe. In development mode we use a workaround for this to make the ESM HMR work. But this workaroudn is not suitable for production.
To test the real production behaviour without this hack, you can use http://localhost:6173/preview.html. This HTML page will use `http://localhost:6174/signup-form.min.js` directly.
