memleak?.js

var af,bf;
var a = new Promise(f=>af=f)
var b = new Promise(f=>bf=f)
af(b);
bf(a);
a.then(
 _ => console.log('af',_),
 _ => console.log('ar',_)
);
b.then(
 _ => console.log('bf',_),
 _ => console.log('br',_)
);