Async await inside Meteor.method

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From this article

async function asyncFun () {
  var value = await Promise
    .resolve(1)
    .then(x => x * 3)
    .then(x => x + 5)
    .then(x => x / 2);
  return value;
}

Meteor.startup(() => {
asyncFun().then(x => console.log(`x: ${x}`));
// <- 'x: 4'
};

But how would you put asyncFun inside Meteor.method and call it?

Meteor.methods({

    async asyncFun () {
        var value = await Promise
            .resolve(10)
            .then(x => x * 3 )
            .then(x=> x + 5)
            .then(x=> x / 2);
        return value;
    }
});

Meteor.startup(() => {
asyncFun().then(x => console.log(`x: ${x}`)); <-- now asyncFunc is not defined?
});

As I understand that you need to place functions inside Meteor.methods so that client side can also call it?