rollup.config.js

import svelte from 'rollup-plugin-svelte';
import typescript from '@rollup/plugin-typescript';
import preprocess from 'svelte-preprocess';
import resolve from '@rollup/plugin-node-resolve';
import { terser } from 'rollup-plugin-terser';
import pkg from './package.json';

const isProd = process.env.BUILD === 'production';
const name = pkg.consName;

export default {
  input: 'src/index.ts',
  output: [
    { file: pkg.module, format: 'es', name },
    { file: pkg.main, format: 'umd', name },
    {
      file: 'dist/selectmadu.min.js',
      format: 'iife',
      name,
      sourcemap: !isProd,
      plugins: [
        terser({
          format: {
            comments: false,
          },
        }),
      ],
    },
  ],
  plugins: [
    svelte({
      dev: !isProd,
      emitCss: false,
      legacy: true,
      preprocess: preprocess(),
    }),
    typescript({ sourceMap: !isProd }),
    resolve(),
  ],
};