rollup.config.dev.js

import { nodeResolve } from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import typescript from 'rollup-plugin-typescript2';
import babel from '@rollup/plugin-babel';
import serve from 'rollup-plugin-serve';
import terser from '@rollup/plugin-terser';
import json from '@rollup/plugin-json';
import summary from 'rollup-plugin-summary';

const plugins = [
  nodeResolve({
    extensions: ['.ts'],
    preferBuiltins: true,
  }),
  commonjs(),
  typescript(),
  json(),
  babel({
    exclude: 'node_modules/**',
    babelHelpers: 'bundled',
  }),
  terser(),
  summary(),
  serve({
    contentBase: './dist',
    host: '0.0.0.0',
    port: 5000,
    allowCrossOrigin: true,
    headers: {
      'Access-Control-Allow-Origin': '*',
    },
  }),
];

export default [
  {
    input: ['src/fluid-level-background-card.ts'],
    output: {
      dir: 'dist',
      format: 'es',
      sourcemap: 'inline',
    },
    plugins: [...plugins],
  },
];