message: build on prepublishOnly
diff: "build": "NODE_ENV=production rollup -c",
  "build:docs": "x0 build examples --out-dir docs",
  "lint": "eslint src examples",
  - "preversion": "npm -s run build",
  + "prepublishOnly": "npm -s run build",
  "start": "x0 dev examples -op 8888",
  "test": "jest"
  },
  