duplicate_package_resolve_alias_next.config.js

const DuplicatePackageCheckerPlugin = require('duplicate-package-checker-webpack-plugin')

module.exports = {
  webpack: (config, { buildId, dev, isServer, defaultLoaders, webpack }) => {
    config.plugins.push(new DuplicatePackageCheckerPlugin())
    config.resolve.alias['fast-deep-equal'] = path.resolve(
      __dirname,
      'node_modules',
      'fast-deep-equal'
    )
    return config
  },
}