Sandbox::https://github.com/lit/lit-element-starter-js/blob/main/rollup.config.js

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/**

* @license

* SPDX-License-Identifier: BSD-3-Clause

import summary from 'rollup-plugin-summary';

import {terser} from 'rollup-plugin-terser';

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

import replace from '@rollup/plugin-replace';

export default {

input: 'my-element.js',

output: {

file: 'my-element.bundled.js',

format: 'esm',

onwarn(warning) {

if (warning.code !== 'THIS_IS_UNDEFINED') {

console.error(`(!) ${warning.message}`);

}

plugins: [

replace({preventAssignment: false, 'Reflect.decorate': 'undefined'}),

resolve(),

/**

* This minification setup serves the static site generation.

* For bundling and minification, check the README.md file.

terser({

ecma: 2021,

module: true,

warnings: true,

mangle: {

properties: {

regex: /^__/,

}),

summary(),

};