How to make create-react-app support .mjs files with webpack?

Question

I'm trying to work with this twitch npm package (https://www.npmjs.com/package/twitch) and am running into some issues when deploying via creat-react-app / react-scripts.

From my understanding, the webpack config that is bundled with create-react-app doesn't like .mjs files that this npm package is using. So, I get the error below when I try to build the app.

./node_modules/twitch/es/API/Kraken/Channel/ChannelApi.mjs
app_1    | Can't import the named export 'Cacheable' from non EcmaScript module (only default export is available)

If I manually deleted the "es" folder, then the build worked and everything functioned as expected. However, this isn't a real solution because when I push to production and deploy there the node modules are re-installed and the build fails once again.

Build processes aren't really my strong suit and after googling around for a while I'm unable to find a solution. If anyone can assist or can point me in the right direction, that would be much appreciated!

If it helps, here is my package.json

{
  "name": "ui",
  "version": "1.0.0",
  "license": "UNLICENCED",
  "private": true,
  "dependencies": {
    "@babel/core": "^7.9.0",
    "@babel/plugin-syntax-dynamic-import": "^7.2.0",
    "@babel/register": "^7.0.0",
    "axios": "^0.19.2",
    "babel-plugin-dynamic-import-node": "^2.2.0",
    "btoa": "^1.2.1",
    "clipboard-copy": "^3.0.0",
    "connected-react-router": "^6.8.0",
    "dateformat": "^3.0.3",
    "dotenv": "^8.0.0",
    "draft-js": "^0.11.0",
    "draft-js-export-html": "^1.4.1",
    "express": "^4.16.4",
    "file-loader": "^3.0.1",
    "firebase": "^5.2.0",
    "history": "^4.7.2",
    "human-date": "^1.4.0",
    "ignore-styles": "^5.0.1",
    "immutability-helper": "^3.0.0",
    "jwt-decode": "^2.2.0",
    "lodash": "^4.17.11",
    "normalizr": "^3.2.4",
    "prop-types": "^15.6.1",
    "qs": "^6.5.2",
    "react": "^16.8.0",
    "react-animations": "^1.0.0",
    "react-dnd": "^7.4.5",
    "react-dnd-html5-backend": "^7.4.4",
    "react-dom": "^16.8.0",
    "react-ga": "^2.5.3",
    "react-gtm-module": "^2.0.10",
    "react-helmet": "^5.2.0",
    "react-image-crop": "^8.3.0",
    "react-is": "^16.8.0",
    "react-loadable": "^5.5.0",
    "react-loading-skeleton": "^2.0.1",
    "react-on-screen": "^2.1.1",
    "react-pdf": "^4.0.5",
    "react-pose": "^4.0.6",
    "react-redux": "^6.0.1",
    "react-router": "^5.1.2",
    "react-router-dom": "^5.1.2",
    "react-scripts": "3.4.0",
    "react-stripe-elements": "^2.0.0",
    "redux": "^4.0.0",
    "redux-devtools-extension": "^2.13.2",
    "redux-thunk": "^2.2.0",
    "reselect": "^3.0.1",
    "semantic-ui-calendar-react": "^0.15.3",
    "semantic-ui-css": "^2.4.1",
    "semantic-ui-react": "^0.87.1",
    "styled-components": "^4.2.0",
    "twitch": "^4.2.4",
    "url-loader": "^1.1.2",
    "validator": "^11.1.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject",
    "lint": "eslint src",
    "server": "NODE_ENV=production node server/bootstrap.js"
  },
  "engines": {
    "node": "^10.0.0",
    "yarn": "^1.12.3"
  },
  "devDependencies": {
    "@babel/plugin-proposal-class-properties": "^7.4.4",
    "@babel/plugin-transform-runtime": "^7.4.4",
    "eslint": "^6.8.0",
    "eslint-config-airbnb": "^18.1.0",
    "eslint-config-prettier": "^6.10.1",
    "eslint-plugin-import": "^2.11.0",
    "eslint-plugin-jsx-a11y": "^6.2.3",
    "eslint-plugin-prettier": "^3.1.2",
    "eslint-plugin-react": "^7.8.1",
    "eslint-plugin-react-hooks": "^3.0.0",
    "prettier": "^2.0.2"
  },
  "proxy": "http://api:8080",
  "browserslist": [
    ">0.2%",
    "not dead",
    "not ie <= 11",
    "not op_mini all"
  ],
  "jest": {
    "moduleNameMapper": {
      "\\.worker.js": "<rootDir>/__mocks__/workerMock.js"
    }
  }
}

Answer 1

A suggestion presented at this GitHub comment was to add react-app-rewired to your project and then use this config-overrides.js file:

module.exports = function override(config) {
  config.module.rules.push({
    test: /\.mjs$/,
    include: /node_modules/,
    type: "javascript/auto"
  });

  return config;
}

In my project I was already using react-app-rewired, so I just added the rule from that snippet. This workaround fixed the error for me.

In the specific case of the twitch library, the author has suggested trying the @next release, although I haven't personally verified that solution yet.