Language rules for String.prototype.includes and Array.prototype.includes are identical

[edg2s]

The former is ES6, and the latter is ES2016. This rule works ok in ES5 environments., but if you are using ES6 you will get a warning for [].includes every time you use ''.includes.

We could rewrite the rule to only fire when the object is a literal string or array but that won't catch many uses in the wild where the object is likely to be a variable.