[meta] run build in prepack, not prepublish

Author: ljharb

package.json

@@ -4,10 +4,10 @@
   "description": "AST utility module for statically analyzing JSX",
   "main": "lib/index.js",
   "scripts": {
-    "prepack": "npmignore --auto --commentLines=autogenerated",
+    "prepack": "npmignore --auto --commentLines=autogenerated && npm run build",
     "prebuild": "rimraf lib",
     "build": "babel src --out-dir lib",
-    "prepublishOnly": "safe-publish-latest && npm test && npm run build",
+    "prepublishOnly": "safe-publish-latest && npm test",
     "prepublish": "not-in-publish || npm run prepublishOnly",
     "prelint": "npm run build",
     "lint": "eslint .",