JavaScript linter fails on ES6 code

[mvollrath]

Overview

We've been using closure linter to lint our JavaScripts, but that project is deprecated and fails when run against ES6 code. We need to find another solution.

Requirements

• JavaScript linter does not break on ES6 code.

Development notes

• We were installing the lint tool in Dockerfile, this must be updated.
• We run lint here.
• ESLint might be a good choice.

Testing scenario

Must run against the old exclusion list (lib,lg_cms_director) and not fail on ES6 syntax.