config-overrides.js

const rewireStyledComponents = require('react-app-rewire-styled-components')
const { useBabelRc, override, useEslintRc } = require('customize-cra')

const styledComponents = obj => config => {
  config = rewireStyledComponents(config, process.env.NODE_ENV, obj)
  return config
}

module.exports = override(
  styledComponents({
    displayName: process.env.NODE_ENV !== 'production',
  })
  // useBabelRc(),
  // useEslintRc()
)