rollup.config.js

// rollup.config.js
import resolve from 'rollup-plugin-node-resolve';
import collectSass from 'rollup-plugin-collect-sass'

export default {
  input: 'materialdjango/static/materialdjango/main.js',
  output: {
    name: 'materialdjango',
    file: 'materialdjango/static/materialdjango/bundle.js',
    format: 'es'
  },
  plugins: [
    collectSass({}),
    resolve({
      // use "module" field for ES6 module if possible
      module: true, // Default: true
      // use "main" field or index.js, even if it's not an ES6 module
      // (needs to be converted from CommonJS to ES6
      // – see https://github.com/rollup/rollup-plugin-commonjs
      main: true,  // Default: true

      // some package.json files have a `browser` field which
      // specifies alternative files to load for people bundling
      // for the browser. If that's you, use this option, otherwise
      // pkg.browser will be ignored
      browser: true,  // Default: false

      // not all files you want to resolve are .js files
      extensions: [ '.mjs', '.js', '.jsx', '.json' ],  // Default: [ '.mjs', '.js', '.json', '.node' ]

      // whether to prefer built-in modules (e.g. `fs`, `path`) or
      // local ones with the same names
      preferBuiltins: false,  // Default: true

      // Lock the module search in this path (like a chroot). Module defined
      // outside this path will be marked as external
      // jail: '/my/jail/path', // Default: '/'

      // Set to an array of strings and/or regexps to lock the module search
      // to modules that match at least one entry. Modules not matching any
      // entry will be marked as external
      // only: [ 'some_module', /^@some_scope\/.*$/ ], // Default: null

      // If true, inspect resolved files to check that they are
      // ES2015 modules
      modulesOnly: true, // Default: false

      // Any additional options that should be passed through
      // to node-resolve
      // customResolveOptions: {
      //   moduleDirectory: 'js_modules'
      // }
    })
  ],
  watch:{
    clearScreen: false
  }
};