#no-lone-blocks

#Configuration

import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-lone-blocks': 'error',
    },
  },
]);

#Rule Details

This rule disallows nested (non-function) lone blocks. A lone block is a block that is not part of an if, for, while, function, try, class static block, or other statement that naturally introduces one. In ES6+, a block can be useful to scope let, const, class, function, or using declarations — this rule only flags blocks that do not contain such block-scoped bindings.

Examples of incorrect code for this rule:

{}

{
  var x = 1;
}

if (foo) {
  bar();
  {
    baz();
  }
}

function foo() {
  {
    var x = 1;
  }
}

class C {
  static {
    {
      foo();
    }
  }
}

Examples of correct code for this rule:

while (foo) {
  bar();
}

if (foo) {
  if (bar) {
    baz();
  }
}

{
  let x = 1;
}

{
  const y = 2;
}

{
  class Bar {}
}

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

class C {
  static {
    foo();
  }
}

#Original Documentation

• ESLint rule: no-lone-blocks