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

WeakMap.prototype.has() - JavaScript | MDN

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El método has() devuelve un boleano indicando ya sea, si el elemento con la llave específica existe o no en el objeto WeakMap.

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

weakmap1.set(object1, "foo");

console.log(weakmap1.has(object1));
// Expected output: true

console.log(weakmap1.has(object2));
// Expected output: false

identificador (key)

Requerido. La llave del elemento a comprobar en el objeto WeakMap.

Boolean

Devuelve true si el elemento con la llave específica existe en el objeto WeakMap; de no encontrarse, devolverá false.

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

wm.has(window); // Devuelve true
wm.has("baz"); // Devuelve false

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