Cut back to minimal reproduction

README.md

@@ -2,15 +2,50 @@
 
 ## Get started
 
-This project is using nx
-
 ```sh
 npm install
 ```
 
-to run test:
+## Failure
+
+Run test:
 
 ```sh
-npx nx test counter
+npm test
 ```
 
+Observe:
+
+```
+ FAIL  |@svelteunit/counter| src/lib/counter.spec.js > counter
+Svelte error: rune_outside_svelte
+The `$state` rune is only available inside `.svelte` and `.svelte.js/ts` files
+ ❯ Module.rune_outside_svelte ../../node_modules/svelte/src/internal/client/errors.js:304:17
+    303|   const error = new Error(`state_descriptors_fixed\nProperty descriptors defined on \`$state\` objects must contain \`value\` and always be \`enumerable\`, \`configurable\` and \`writable\`.`);
+    304|
+    305|   error.name = 'Svelte error';
+       |                ^
+    306|   throw error;
+    307|  } else {
+ ❯ get ../../node_modules/svelte/src/internal/client/runtime.js:1197:28
+ ❯ mount ../../node_modules/@testing-library/svelte/src/core/modern.svelte.js:26:17
+ ❯ Module.render ../../node_modules/@testing-library/svelte/src/pure.js:72:21
+ ❯ src/lib/counter.spec.js:7:
+```
+
+## Workaround
+
+To resolve the failure, you can add to `libs/counter/package.json`:
+
+```diff
+  {
+    "name": "@svelteunit/counter",
+    "version": "0.0.1",
+    "private": true,
+-   "type": "module"
++   "type": "module",
++   "devDependencies": {
++     "@testing-library/svelte": "^5.2.3"
++   }
+  }
+```

libs/counter/package.json

@@ -1,10 +1,6 @@
 {
   "name": "@svelteunit/counter",
   "version": "0.0.1",
-  "dependencies": {},
-  "main": "./index.js",
-  "module": "./index.mjs",
-  "typings": "./index.d.ts",
   "private": true,
   "type": "module"
 }

libs/counter/src/lib/counter.spec.js

@@ -1,6 +1,8 @@
+import { test } from 'vitest';
+
 import Counter from './counter.svelte';
 import { render } from '@testing-library/svelte';
 
-describe('counter', () => {
+test('counter', () => {
   console.log(render(Counter));
 });

libs/counter/vite.config.js

@@ -4,18 +4,8 @@ import { svelte } from '@sveltejs/vite-plugin-svelte';
 import { svelteTesting } from '@testing-library/svelte/vite';
 
 export default defineConfig({
-  root: __dirname,
-  cacheDir: '../../node_modules/.vite/libs/counter',
   plugins: [svelte(), svelteTesting()],
   test: {
-    watch: false,
-    globals: true,
     environment: 'jsdom',
-    include: ['src/**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}'],
-    reporters: ['default'],
-    coverage: {
-      reportsDirectory: '../../coverage/libs/counter',
-      provider: 'v8',
-    },
   },
 });