How to get results from an async function inside a sync function?

Question

I was using a library "async/await", which included an await() function that you would use like this inside a sync function/method

const await = require('asyncawait/await')

// An example class method
getUser(username) {
    const user = await(this.getUserFromDb(username))
    if (user) {
        return user
    } else {
        throw "User does not exist"
    }
}

async getUserFromDb(username) {
    // Get user from database
}

But now, "async/await" is no longer usable in node16 because of "fibers" not working.

I still need to have a sync method, that uses an async method inside of it and returns a definitive value, not a promise. How can I do that?