Upgrade eslint-webpack-plugin to fix opt-out flag (#10590)

Author: mrmckeb

packages/react-scripts/config/webpack.config.js

@@ -759,7 +759,7 @@ module.exports = function (webpackEnv) {
           extensions: ['js', 'mjs', 'jsx', 'ts', 'tsx'],
           formatter: require.resolve('react-dev-utils/eslintFormatter'),
           eslintPath: require.resolve('eslint'),
-          emitWarning: isEnvDevelopment && emitErrorsAsWarnings,
+          failOnError: !(isEnvDevelopment && emitErrorsAsWarnings),
           context: paths.appSrc,
           cache: true,
           cacheLocation: path.resolve(

packages/react-scripts/package.json

@@ -53,7 +53,7 @@
     "eslint-plugin-react": "^7.21.5",
     "eslint-plugin-react-hooks": "^4.2.0",
     "eslint-plugin-testing-library": "^3.9.2",
-    "eslint-webpack-plugin": "^2.1.0",
+    "eslint-webpack-plugin": "^2.5.2",
     "file-loader": "6.1.1",
     "fs-extra": "^9.0.1",
     "html-webpack-plugin": "4.5.0",