Resolve app paths from realpath of CWD, fix facebook#637 (facebook#648)

* Resolve app paths from realpath of CWD, fix facebook#637

* Use new resolveApp() for NODE_PATH too

Author: motiz88

config/paths.js

@@ -10,6 +10,14 @@
 // @remove-on-eject-end
 
 var path = require('path');
+var fs = require('fs');
+
+// Make sure any symlinks in the project folder are resolved:
+// https://github.com/facebookincubator/create-react-app/issues/637
+var appDirectory = fs.realpathSync(process.cwd());
+function resolveApp(relativePath) {
+  return path.resolve(appDirectory, relativePath);
+}
 
 // We support resolving modules according to `NODE_PATH`.
 // This lets you use absolute paths in imports inside large monorepos:
@@ -25,11 +33,7 @@ var path = require('path');
 var nodePaths = (process.env.NODE_PATH || '')
   .split(process.platform === 'win32' ? ';' : ':')
   .filter(Boolean)
-  .map(p => path.resolve(p));
-
-function resolveApp(relativePath) {
-  return path.resolve(relativePath);
-}
+  .map(resolveApp);
 
 // config after eject: we're in ./config/
 module.exports = {