**Please describe what the rule should do:** **What category of rule is this (place an "X" next to just one item)?** [ ] Enforces code style [ ] Warns about a potential error [ ] Suggests an alternate way of doing something [ ] Other (please specify:) **Provide 2-3 code examples that this rule will warn about:** ```js ``` **Why should this rule be included in ESLint (instead of a plugin)?**