fix: offer an envName to preset-react-app

Author: JLHwung

packages/eslint-config-react-app/base.js

@@ -36,6 +36,10 @@ module.exports = {
     // If a Babel plugin does not introduce a syntax extension, it is
     // okay to not include it here since it is no-op for parser
     babelOptions: {
+      // babel-preset-react-app requires an env name
+      // The env name does not impact the range of syntax plugins
+      // use the Babel default "development" here
+      envName: 'development',
       presets: [require.resolve('babel-preset-react-app')],
     },
   },