Added tips for npm run lint and build errors (#151) (#460)

Author: romarioraffington

README.md

@@ -51,7 +51,17 @@ This will run the automated build process, start up a webserver, and open the ap
 4. Make sure files with names that begin with a dot (.babelrc, .editorconfig, .eslintrc) are copied to the project directory root. This is easy to overlook if you copy this repository manually.
 5. Don't run the project from a symbolic link. It may cause issues with file watches.
 6. Delete any .eslintrc that you're storing in your user directory. Also, disable any ESLint plugin / custom rules that you've enabled within your editor. These will conflict with the ESLint rules defined in this project.
-7. Make sure you don't have NODE_ENV set to production on your machine. If you do then the [development dependencies won't be installed](https://github.com/coryhouse/react-slingshot/issues/400#issuecomment-290497767). Here's [how to check](http://stackoverflow.com/a/27939821/26180). 
+7. Make sure you don't have NODE_ENV set to production on your machine. If you do then the [development dependencies won't be installed](https://github.com/coryhouse/react-slingshot/issues/400#issuecomment-290497767). Here's [how to check](http://stackoverflow.com/a/27939821/26180).
+8. Tip: Things to check if you get an `npm run lint` error or build error:
+
+    * If ESW found an error or warning in your project (e.g. console statement or a missing semi-colon), the lint thread will exit with `Exit status 1`. To fix: 
+
+      1. Change the `npm run lint` script to `"esw webpack.config.* src tools; exit 0"`
+      1. Change the `npm run lint:watch` script to `"esw webpack.config.* src tools --watch; exit 0"`
+
+      > Note: Adding `exit 0` will allow the npm scripts to ignore the status 1 and allow ESW to print all warnings and errors.
+  
+    * Ensure the `eslint`/`esw` globally installed version matches the version used in the project. This will ensure the `esw` keyword is resolved.
 
 ## Technologies
 Slingshot offers a rich development experience using the following technologies: