Disable inline 3 option (#5281)

Author: Timer

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

@@ -149,6 +149,11 @@ module.exports = {
             // Pending further investigation:
             // https://github.com/mishoo/UglifyJS2/issues/2011
             comparisons: false,
+            // Disabled because of an issue with Terser breaking valid code:
+            // https://github.com/facebook/create-react-app/issues/5250
+            // Pending futher investigation:
+            // https://github.com/terser-js/terser/issues/120
+            inline: 2,
           },
           mangle: {
             safari10: true,