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Showing content from https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Set/clear below:

Set.prototype.clear() - JavaScript | MDN

Baseline Widely available

clear() は Set インターフェイスのメソッドで、この集合からすべての要素を取り除きます。

const set1 = new Set();
set1.add(1);
set1.add("foo");

console.log(set1.size);
// Expected output: 2

set1.clear();

console.log(set1.size);
// Expected output: 0

なし。

なし (undefined)。

const mySet = new Set();
mySet.add(1);
mySet.add("foo");

console.log(mySet.size); // 2
console.log(mySet.has("foo")); // true

mySet.clear();

console.log(mySet.size); // 0
console.log(mySet.has("foo")); // false

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