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

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[NPMURL]: https://npmjs.org/package/@putout/plugin-remove-useless-spread "npm"

> Spread syntax can be used when all elements from an object or array need to be included in a list of some kind.
>
> (c) MDN

🐊Putout plugin adds ability to remove useless spread syntax. Merged with @putout/plugin-spread.

Install

``
npm i @putout/plugin-remove-useless-spread
`

Rule

`json
{
"rules": {
"remove-useless-spread/array": "on",
"remove-useless-spread/object": "on",
"remove-useless-spread/nested": "on"
}
}
`

array

The thing is [...b] can be used for:

- copying an array;
- converting different value type like string to an array.

So better to be more concrete and use slice for copying and Array()/Array.from() for converting to decrease cognitive load.
Also sometimes there is no need on any of this operations, and we can drop spread.

$3

`js
for (const a of [...b]) {}

const places = [...getPlaces()];
`

$3

`js
for (const a of b) {}

const places = getPlaces();

// Array constructor creates sparse array
[...Array(5)].map(Number);
`

object

$3

`js
const a = {
...fn(),
};
`

$3

`js
const a = fn();
`

nested

Checkout in 🐊Putout Editor.

$3

`js
[
...[
...a,
...b,
],
...x,
];
`

$3

`js
[
...a,
...b,
...x,
];
``

License

MIT