How to pass to the outside scope (without console.log) a variable inside an .evaluate callback in google earth engine?

Question

I have this callback inside the .evaluate function on google earth engine:

numberServer.evaluate(function(numberClient) {
  console.log('Client-side primitive data type', typeof numberClient);  // number
  console.log('Client-side number', numberClient);  // 10.3
  console.log('Client-side number used in expression', numberClient + 10);  // 20.3
})

The above will correctly output the value of numberServer to the client.

The problem is that I need to capture the value of numberClient in a variable. How can I do that?

I tried using a promise with no success.

function Test(){ return new Promise(function(resolve) {
    numberServer.evaluate(function(numberClient) {
        console.log('Client-side primitive data type', typeof numberClient);  // number
        console.log('Client-side number', numberClient);  // 10.3
        console.log('Client-side number used in expression', numberClient + 10);  // 20.3
  
        resolve(numberClient);
    })
});
};

var test2;

async function test3() {
    return test2 = await Test();
}

var test4;

(async function(){
  test4 = await test3();
})();


var test5 = test4;

test5 is always undefined and that's the variable I want to have.

I also tried returning the callback:

function Test() { return numberServer.evaluate(function(numberClient) {
  console.log('Client-side primitive data type', typeof numberClient);  // number
  console.log('Client-side number', numberClient);  // 10.3
  console.log('Client-side number used in expression', numberClient + 10);  // 20.3
  return numberClient;
})
};


var out = Test();