@putout/plugin-remove-nested-blocks 
Delimited by a pair of curly brackets block statement is used to group zero or more statements.
(c) MDN
🐊Putout plugin adds ability to find and remove nested bocks.
☝️Remember, when you writing a transform you can skip all parts related to removing nested blocks and just reuse current plugin it will make your code simpler and less error prone.
Install
npm i @putout/plugin-remove-nested-blocks
Rule
{
    "rules": {
        "remove-nested-blocks": "on"
    }
}
❌ Example of incorrect code
for (const x of Object.keys(a)) {
    {
        console.log(x);
        console.log(xxx);
    }
}
✅ Example of correct code
for (const x of Object.keys(a)) {
    console.log(x);
    console.log(xxx);
}
switch(x) {
case 1: {
    const m = 5;
}
}
Comparison
| Linter | Rule | Fix | 
|---|---|---|
| 🐊 Putout | remove-nested-blocks | ✅ | 
| ⏣ ESLint | no-lone-blocks | ❌ | 
License
MIT
 coderaiser
coderaiser