small improvements package.json

Author: timea-solid

package.json

@@ -3,12 +3,18 @@
   "version": "2.3.1",
   "description": "Solid-compatible Panes: Source editor",
   "main": "src/sourcePane.js",
+  "files": [
+    "/src",
+    "README.md",
+    "LICENSE"
+  ],
   "scripts": {
     "build": "echo nothing to build",
     "lint": "eslint",
     "test": "jest --no-coverage",
     "test-coverage": "jest --coverage --collectCoverageFrom=src/**/*.[jt]s",
-    "prepublishOnly": "npm run lint && npm run test",
+    "prepublishOnly": "npm run test && npm run build",
+    "preversion": "npm run lint && npm test",
     "postpublish": "git push origin main --follow-tags"
   },
   "repository": {