VueJS function reutrn not working

I've a little problem with my vuejs global function. I created this global function in my app.js

export function getSession(key) {
  $.post('/api/session', function (result) {
    if (result.hasOwnProperty(key)) {
        return result[key];
    }
  });
}

If i echo the return of this function in a vue component at the mounted() part the console tells me undefined. But if i replace line 4 with console.log(result[key]) I get the right value.

Why is this so. Please help!

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