Add prepublishOnly script to build/test

Author: IanVS

package.json

@@ -11,7 +11,8 @@
   "scripts": {
     "build": "tsc -p tsconfig.json",
     "test": "vitest run --coverage && eslint .",
-    "test:watch": "vitest"
+    "test:watch": "vitest",
+    "prepublishOnly": "pnpm build && pnpm test"
   },
   "author": "Ian VanSchooten <[email protected]>",
   "license": "MIT",