Reproduction for microsoft/vscode-eslint#676

Steps to reproduce:

1. Clone this repository:

   git clone https://github.com/loilo/repro-vscode-eslint-676

2. Open the cloned folder with Visual Studio Code (and the vscode-eslint extension enabled):

   code repro-vscode-eslint-676

3. Take a look at the main.js file and observe the incorrectly reported undefined variable.

4. Note that everything works as expected when the exact same options are defined in an .eslintrc file. This can be verified by removing the -- suffix from the the included .eslintrc-- file.