message: rm -rf dist before build
diff: "main": "dist/index.umd.js",
  "module": "dist/index.esm.js",
  "scripts": {
  + "prebuild": "rm -rf dist",
  "build": "NODE_ENV=production rollup -c",
  "build:docs": "x0 build examples --out-dir docs",
  "lint": "eslint src examples",
  