should work

package.json

@@ -21,8 +21,12 @@
 		"eslint": "^8.28.0",
 		"eslint-config-prettier": "^8.5.0",
 		"eslint-plugin-svelte3": "^4.0.0",
+		"mdsvex": "^0.10.6",
+		"postcss": "^8.4.20",
+		"postcss-scss": "^4.0.6",
 		"prettier": "^2.8.0",
 		"prettier-plugin-svelte": "^2.8.1",
+		"sass": "^1.57.1",
 		"svelte": "^3.54.0",
 		"svelte-check": "^2.9.2",
 		"tslib": "^2.4.1",