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

WeakMap.prototype.get() - JavaScript | MDN

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O método get() retorna um elemento especificado de um objeto WeakMap.

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

chave

Obrigatório. A chave do elemento a ser retornado pelo objeto WeakMap.

O elemento associado à chave especificada no objeto WeakMap. Se a chave não for encontrada, retorna-se undefined.

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

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

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