Standard does not warn of adding properties to non-extensible objects.

[setpill]

What version of standard?
12.0.1

What operating system, Node.js, and npm version?
OS: Ubuntu 18.04
Node.js: v8.12.0
npm: 6.4.1

Example code

'use strict'

var obj = {}
Object.preventExtensions(obj)

obj.test = 'this throws a TypeError'

What did you expect to happen?
Standardjs to warn me of the TypeError that running this code throws.

What actually happened?
Standardjs gives no warning and the code throws a TypeError.

[LinusU]

Is there an ESLint rule that would warn against that?

[setpill]

I'm not sure if a new one would need to be written or if one already exists.

[setpill]

After discussion in the ESLint gitter, it seems unlikely that such a rule will be added, so closing this issue.