fix to use with sveltekit

vite.config.js

@@ -0,0 +1,39 @@
+import {sveltekit} from '@sveltejs/kit/vite'
+import {defineConfig} from 'vitest/config'
+
+const preview = process?.env?.PREVIEW ?? false
+const config = {
+	plugins: [sveltekit()],
+	test: {
+		include: ['tests/unit/**/*.{test,spec}.{js,ts}'],
+		environment: 'jsdom',
+		threads: false,
+		globals: true,
+		coverage: {
+			// prettier-ignore
+			include: ['src/lib/**'],
+			// prettier-ignore
+			reporter: [
+				'text',
+				'text-summary',
+				'lcovonly',
+				'cobertura'
+			],
+		},
+	},
+	build: {
+		sourcemap: true,
+		rollupOptions: {
+			// prettier-ignore
+			external: [
+				'quill',
+			],
+		},
+	},
+}
+
+if (preview) {
+	Reflect.deleteProperty(config, 'build')
+}
+
+export default defineConfig(config)