no-lone-blocks does not check statements in switch cases

[not-an-aardvark]

Tell us about your environment

• ESLint Version: master
• Node Version: 7.5.0
• npm Version: 4.1.2

What parser (default, Babel-ESLint, etc.) are you using?

default

Please show your full configuration:

rules:
  no-lone-blocks: error

What did you do? Please include the actual source code causing the issue.

switch (foo) {
  case 1:
    bar();
    {
      baz();
    }
}

What did you expect to happen?

I expected an error to be reported.

What actually happened? Please include the actual, raw output from ESLint.

No error was reported.

I know that it's fairly common to enclose an entire switch case in a block, e.g.

switch (foo) {
  case 1: {
    bar();
    baz();
  }
}

So I think the best solution is to report a block in a switch case only if there are other statements in the case.

[0xallie]

Please make this configurable. I want to consistently use blocks in all cases of switch statements that use let or const, but want to be warned about potential unnecessary blocks elsewhere.