[ES2024] Manually settle a promise using Promise.withResolvers

If we want to be able to modify the state of a promise from outside the constructor, we can use the Promise.withResolvers method to get access to the promise, and its resolve and reject functions.

// old approach
let res, rej;

const promise = new Promise((resolve, reject) => {
    res = resolve;
    rej = reject;
})

onClick(res)

// New approach

const { promise, resolve, reject } = Promise.withResolvers()

onClick(resolve)