Add HappyPack to your create-react-app via react-app-rewired.
This package is not yet published to the npm registry. Install from GitHub:
yarn add --dev react-app-rewire-happy-pack
OR
npm install --save-dev react-app-rewire--happy-pack
In your react-app-rewired configuration:
/* config-overrides.js */
const rewireHappyPackLoader = require('react-app-rewire--happy-pack');
module.exports = function override(config, env) {
// ...
config = rewireHappyPackLoader(config, env);
// ...
return config;
}