create-react-app enforces @typescript-eslint/no-namespace, a style rule

Created by: szhu

Describe the bug

1. create-react-app --typescript
2. Add a namespace in a file
3. I get the error: ES2015 module syntax is preferred over custom TypeScript modules and namespaces.eslint(@typescript-eslint/no-namespace). There seems to be no way to turn off this rule, according to #3886 (closed).

Why this is a bug:

From https://github.com/facebook/create-react-app/issues/2157#issuecomment-301452953:

Our rules are specifically picked to not enforce style, and to only find logical mistakes.

Whether or not a namespace is used is most definitely not a choice of style and not a logical mistake. Please remove this rule or give me an option to remove this rule.