Don't use app node_modules folder as a resolve fallback (facebook#3884)

Author: gaearon

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

@@ -95,7 +95,7 @@ module.exports = {
  // We placed these paths second because we want `node_modules` to "win"
  // if there are any conflicts. This matches Node resolution mechanism.
  // https://github.com/facebookincubator/create-react-app/issues/253
- modules: ['node_modules', paths.appNodeModules].concat(
+ modules: ['node_modules'].concat(
  // It is guaranteed to exist because we tweak it in `env.js`
  process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
  ),

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

@@ -102,7 +102,7 @@ module.exports = {
  // We placed these paths second because we want `node_modules` to "win"
  // if there are any conflicts. This matches Node resolution mechanism.
  // https://github.com/facebookincubator/create-react-app/issues/253
- modules: ['node_modules', paths.appNodeModules].concat(
+ modules: ['node_modules'].concat(
  // It is guaranteed to exist because we tweak it in `env.js`
  process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
  ),