rollup.config.js

import peerDepsExternal from 'rollup-plugin-peer-deps-external'
import resolve from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs'
import typescript from 'rollup-plugin-typescript2'
import postcss from 'rollup-plugin-postcss'
import copy from 'rollup-plugin-copy'

// eslint-disable-next-line @typescript-eslint/no-var-requires
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,
    },
  ],
  external: [
    'react',
    'react-dom',
    'react-router-dom',
    '@material-ui/core',
    '@material-ui/icons',
    '@material-ui/styles',
    '@material-ui/lab',
  ],
  plugins: [
    peerDepsExternal(),
    resolve(),
    commonjs(),
    typescript({ useTsconfigDeclarationDir: true }),
    postcss(),
    copy({
      targets: [
        {
          src: 'src/variables.scss',
          dest: 'build',
          rename: 'variables.scss',
        },
        {
          src: 'src/typography.scss',
          dest: 'build',
          rename: 'typography.scss',
        },
      ],
    }),
  ],
}