"message": "for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array."
},
{
"selector": "LabeledStatement",
"message": "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand."
},
{
"selector": "WithStatement",
"message": "`with` is disallowed in strict mode because it makes code impossible to predict and optimize."