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

WeakMap.prototype.get() - JavaScript | MDN

Baseline Widely available

get() メソッドは、WeakMap オブジェクトから指定された要素を返します。

const weakmap1 = new WeakMap();
const object1 = {};
const object2 = {};

weakmap1.set(object1, 42);

console.log(weakmap1.get(object1));
// Expected output: 42

console.log(weakmap1.get(object2));
// Expected output: undefined

key

必須。WeakMap オブジェクトから返す要素のキーです。

指定されたキーと関連した要素を返します。キーが WeakMap オブジェクトに見つからない場合、 undefined を返します。

var wm = new WeakMap();
wm.set(window, "foo");

wm.get(window); // "foo" を返す
wm.get("baz"); // undefined を返す

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