config-overrides.js

const StylelintPlugin = require('stylelint-webpack-plugin')
const { override, addWebpackPlugin } = require('customize-cra')
const webpack = require('webpack')
const packageJson = require('./package.json')

module.exports = override(
    (
        () => {
            if (process.env.NODE_ENV === 'development') {
                // check style files on development only
                return addWebpackPlugin(
                    new StylelintPlugin({
                        context: 'src/style',
                    })
                )
            }
        }
    )(),

    addWebpackPlugin(
        // define extra environment variables
        new webpack.DefinePlugin({
            'process.env.DAKARA_VERSION': JSON.stringify(packageJson.version),
            'process.env.DAKARA_BUGTRACKER': JSON.stringify(packageJson.bugs.url),
            'process.env.DAKARA_PROJECT_HOMEPAGE': JSON.stringify(
                packageJson.projectHomepage
            ),
        })
    ),
)