Build lit into a single javascript file

package.json

{
  "name": "lit",
  "license": "MIT",
  "scripts": {
    "build": "npm install && rollup -c"
  },
  "dependencies": {
    "@rollup/plugin-node-resolve": "^13.0.0",
    "lit": "^2.0.0-rc.2",
    "rollup": "^2.52.7"
  }
}

rollup.config.mjs

import resolve from '@rollup/plugin-node-resolve';

export default {
  input: './node_modules/lit/index.js',
  plugins: [
    resolve({
      browser: true,
    }),
  ],
  preserveEntrySignatures: true,
  output: {
    inlineDynamicImports: true,
    format: 'es',
    name: 'main',
    sourcemap: false,
    file: 'lit.js'
  }
};