Single-spa import utiltity module in a Vite.js application - vite

Question

I'm tring to import a utility module named #hexagone/styleguide in a Vite.js application named #hexagone/login without success. The documentation isn't helpfull in this particuliar case. cf utility-modules
I successfuly import the module in a equivalent Vue.js application.
In the vite.config.js file of my utility module, i'm declaring my module #hexagone/styleguide external (the build is ok).
build: {
rollupOptions: {
external: [/^#hexagone\/.+/],
}
}
And i'm importing it in my Vite.js application like that :
import { publicApiFunction } from '#hexagone/styleguide'
And my root-config project :
<script type="systemjs-importmap">
{
"imports": {
"single-spa": "https://cdn.jsdelivr.net/npm/single-spa/lib/system/single-spa.min.js",
"vue": "https://cdn.jsdelivr.net/npm/vue/dist/vue.min.js",
"#hexagone/root-config": "http://localhost:9002/hexagone-root-config.js",
"#hexagone/styleguide": "http://localhost:8080/hexagone-styleguide.js",
[...]
}
}
</script>
The error in the devtools console :
GET http://localhost:5173/src/components/Login.vue net::ERR_ABORTED 500 (Internal Server Error)
app-errors.js:11 Uncaught TypeError: application '#hexagone/login' died in status LOADING_SOURCE_CODE: Failed to fetch dynamically imported module: http://localhost:5173/src/main.js
The error in the Vite.js application console :
The following dependencies are imported but could not be resolved:
#hexagone/styleguide (imported by C:/git/login/src/components/Login.vue?id=0)
Are they installed?
Failed to resolve import "#hexagone/styleguide" from "src\components\Login.vue". Does the file exist?
16:30:09 [vite] Internal server error: Failed to resolve import "#hexagone/styleguide" from "src\components\Login.vue". Does the file exist?