rollup.config.js

import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import typescript from '@rollup/plugin-typescript';
import postcss from 'rollup-plugin-postcss';
import dts from 'rollup-plugin-dts';

const packageJson = require('./package.json');

export default [
  {
    input: 'src/index.ts',
    output: [
      {
        file: packageJson.main,
        format: 'cjs',
        sourcemap: true,
      },
      {
        file: packageJson.module,
        format: 'esm',
        sourcemap: true,
      },
    ],
    plugins: [
      postcss({
        use: 'sass',
        minimize: true,
        extensions: ['.scss', '.css'],
      }),
      resolve({ preferBuiltins: true }),
      commonjs(),
      typescript({ tsconfig: './tsconfig.json' }),
    ],
  },
  {
    input: 'dist/esm/types/index.d.ts',
    output: [{ file: 'dist/index.d.ts', format: 'esm' }],
    plugins: [dts()],
    external: [/\.(css|less|scss)$/],
  },
];