Rule proposal: prefer-set-size

[fisker]

Description

Come up with the idea because I wrote something stupid. https://github.com/sindresorhus/globby/blob/51c8f68e63dc7a49f986bd0751e3488ced7485ec/tests/globby.js#L301

Fail

const set = new Set(foo);
const length = [...set].length;

const uniqueLength = [...new Set(array)].length

Pass

const set = new Set(foo);
const {size} = set;

const uniqueLength = new Set(array).size;

[sindresorhus]

Accepted