webpack.config.js

        // First, run the linter.
        // It's important to do this before Babel processes the JS.
        {
          test: /\.(js|mjs|jsx)$/,
          enforce: 'pre',
          use: [
            {
              options: {
                formatter: require.resolve('react-dev-utils/eslintFormatter'),
                eslintPath: require.resolve('eslint'),
              },
              loader: require.resolve('eslint-loader'),
            },
          ],
          include: paths.appSrc,
        },