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

WeakMap.prototype.get() - JavaScript | MDN

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El método get() devuelve un elemento específico del 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

key

Requerido. Es la llave del elemento a retornar desde el objeto WeakMap.

El elemento asociado con la llave específica en el objeto WeakMap. Si la llave no está presente, devolverá undefined.

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

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

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