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

Map.prototype.keys() - JavaScript | MDN

Baseline Widely available

El método keys() de las instancias Map regresa un nuevo objeto iterator de map que contiene las llaves para cada elemento en este map en orden de inserción.

const map1 = new Map();

map1.set("0", "foo");
map1.set(1, "bar");

const iterator1 = map1.keys();

console.log(iterator1.next().value);
// Expected output: "0"

console.log(iterator1.next().value);
// Expected output: 1

Ningúno.

Un nuevo objeto iterator iterable.

const myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");

const mapIter = myMap.keys();

console.log(mapIter.next().value); // "0"
console.log(mapIter.next().value); // 1
console.log(mapIter.next().value); // {}

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