node mocha babel how to avoid parsing a specific library?

CMy project directory structure is the following :

project
   |_ config  ( config .js files)
   |_ coverage ( reporting result files )
   |_ dist ( compiled project for distribution )
   |_ docs ( temporary wip .js files NOT TO BE parsed ! )
   |_ server
       |_helpers ( js files )
       |_models. ( js files )
       |_v1
          |_controllers ( js files)
          |_routes (js files )
          L_tests ( js files )
      |_ all .files ( .env, .git, .yarn, ..etc
      |_index.js
      |_package.json

running a test :

    "test:v1": "cross-env NODE_ENV=test ./node_modules/.bin/mocha 
    --timeout 15000 --ui bdd --reporter spec --colors 
    --compilers js:babel-core/register server/v1/tests/user.test.js 
    --recursive",

I get a parsing error on a .js files which is located in the doc directory as these files are not to e taken in account in the test, how can I avoid parsing of the docs directory ?
I am using Webstorm 2017 as an IDE...

thanks for feedback

via erwin