I can't figure out how to use prefer-readonly-parameter-types rule on interop with DOM (lib.dom typings).

Previously i using @typescript-eslint/eslint-plugin: ^2.20.0 and have code like this:

class SomeClass {
...
    public someFunc(element: HTMLElement): void {
        ...
    }
}

After update to 2.23.0 i got a eslint error
Parameter should be a read only typeeslint(@typescript-eslint/prefer-readonly-parameter-types)
This rule require something like

class SomeClass {
...
    public someFunc(element: Readonly<HTMLElement>): void {
        ...
    }
}

After that i got next error on the same place Make all properties in T readonly.
It means that i should modify external library's code to fix that error, but it's impossible

I think that lib.dom (HTMLElement, etc) just 1 out of many errors from this rule on project-library interop layer.

This error caused by #1513
So I suggest to switch rule level from error to warn in packages/eslint-plugin/src/configs/all.json