vite font url bug

This is a minimum reproduction repository for an issue where an invalid url is output during a vite build if you use a full url as the base.

This simply specifies a full URL as the base

export default defineConfig({
  ...
  base: "https://assets.site.com/",
});

Reference the font asset as you normally would:

<style>
  @font-face {
    font-family: "Arial";
    src: local("Arial"), url("/fonts/Arial.ttf") format("truetype");
  }
</style>

Perform a build with npm run build

The parameter that is generated during a build for the url() call is invalid:

<style>
  @font-face {
    font-family: "Arial";
    src: local("Arial"),
      url("https:/assets.site.com/fonts/Arial.ttf") format("truetype");
  }
</style>

The generated source has the incorrect amount of /s after http: