@putout/plugin-remove-useless-variables [![NPM version][NPMIMGURL]][NPMURL]

[NPMIMGURL]: https://img.shields.io/npm/v/@putout/plugin-remove-useless-variables.svg?style=flat&longCache=true
[NPMURL]: https://npmjs.org/package/@putout/plugin-remove-useless-variables "npm"

🐊Putout plugin adds ability to find and remove useless variables. Renamed to @putout/plugin-variables.

Install

``
npm i @putout/plugin-remove-useless-variables -D
`

Rules

- ✅ assignment;
- ✅ declaration;
- ✅ destruct;
- ✅ duplicate;
- ✅ remove;
- ✅ rename;

Config

`json
{
"rules": {
"remove-useless-variables/assignment": "on",
"remove-useless-variables/rename": "on",
"remove-useless-variables/remove": "on",
"remove-useless-variables/destruct": "on",
"remove-useless-variables/declaration": ["on", {
"maxLength": 20
}],
"remove-useless-variables/duplicate": "on"
}
}
`

assignment

Checkout in 🐊Putout Editor.

$3

`js
while (!(files = readDirectory(parentDir)).length) {}
`

$3

`js
while (!readDirectory(parentDir).length) {}
`

rename

$3

`js
function hi(a) {
const b = a;
}
`

$3

`js
function hi(b) {}
`

destruct

$3

`js
function hi(c) {
const {a, b} = c;
}
`

$3

`js
function hi({a, b}) {}
`

remove

$3

`js
const child_process = require('node:child_process');

const {exec, spawn} = child_process;
`

$3

`js
const {exec, spawn} = require('node:child_process');
`

$3

Check it out in 🐊Putout Editor.

$3

`js
const a = 5;
const b = a;

const c = 5;

d = c;
`

$3

`js
const b = 5;

d = 5;
`

$3

Check it out in 🐊Putout Editor.

$3

`js
function x() {
const a = 5;
return a;
}

const z = b.c.replace('x', 'y');

b.c = z;
`

$3

`js
function x() {
return 5;
}

b.c = b.c.replace('x', 'y');
`

$3

Check it out in 🐊Putout Editor.

$3

`js
const DestructuringErrors = function DestructuringErrors(a, b) {
return [a, b];
};
`

$3

`js
function DestructuringErrors(a, b) {
return [a, b];
}

bc = b.c.replace('x', 'y');
``

License

MIT