Disable loading constants module (#39)

* Disable loading `constants` module

* Disable node constants by default, use `USE_NODE_CONSTANTS` to import native constants

Author: visualfanatic

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

@@ -298,6 +298,7 @@ module.exports = {
     net: 'empty',
     tls: 'empty',
     child_process: 'empty',
+    constants: process.env.USE_NODE_CONSTANTS === 'true',
   },
   // Turn off performance hints during development because we don't do any
   // splitting or minification in interest of speed. These warnings become

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

@@ -384,5 +384,6 @@ module.exports = {
     net: 'empty',
     tls: 'empty',
     child_process: 'empty',
+    constants: process.env.USE_NODE_CONSTANTS === 'true',
   },
 };