app/package.json

{
  "dependencies": {
    "lit": "*"
  },
  "devDependencies": {
    "@rollup/plugin-node-resolve": "*",
    "@rollup/plugin-terser": "*",
    "@web/rollup-plugin-html": "*",
    "@web/rollup-plugin-import-meta-assets": "*",
    "rollup": "~2",
    "tslib": "*",
    "typescript": "*"
  }
}