v3/packages/web/craco.config.js

const path = require('path');
const { getLoader, loaderByName } = require('@craco/craco');

const includePaths = [path.join(__dirname, '..')];

module.exports = {
  webpack: {
    alias: {},
    plugins: [],
    configure: (webpackConfig, { env, paths }) => {
      const { isFound, match } = getLoader(webpackConfig, loaderByName('babel-loader'));
      if (isFound) {
        const include = Array.isArray(match.loader.include)
          ? match.loader.include
          : [match.loader.include];
        match.loader.include = [...include, ...includePaths];
      }
      return webpackConfig;
    },
  },
};