Why is this configuration for ESLint in Visual Studio 2017 not working?

Question

I am currently wondering, why ESLint is not working in my project in Visual Studio 2017. There is the file ".eslintrc" in the project-root:

{
"extends": "defaults/configurations/eslint",
"env": {
    "browser": true
},
"globals": {
    "xhr": true
},
"rules": {
    "eqeqeq": [ "error", "always", { "null": "ignore" } ]
}
}

If I remove the line with "eqeqeq", everything is working fine. But as soon as I add this line, no errors will be displayed at all.

Question 1: Is there any way to see an error-message about the issue ESLint obviously has?

Question 2 as a fallback: What is the issue with this line?

Answer 1

Thanks to btmills I took a dive into the sources and found the version: VS 2017 uses ESLint 2.0.0 (released 2016-02-12).

The correct configuration is:

"eqeqeq": [ 2, "allow-null" ]

Documentation is available here:

• Getting started
• Rules

The links from the error-list in VS 2017 lead to the current documentation, where you can find many features that do not work in version 2.0.0.