How to convert Map keys to array?

Lets say I have the following map:

let myMap = new Map().set('a', 1).set('b', 2);

And I want to obtain ['a', 'b'] based on the above. My current solution seems so long and horrible.

let myMap = new Map().set('a', 1).set('b', 2);
let keys = [];
for (let key of myMap)
  keys.push(key);
console.log(keys);

There must be a better way, no?