Please try following in JS file:


var ale = {
    a:1,
    b:3
}

/**
 * 
 * @param {ale} b
 * @returns {undefined}
 */
Folkband.prototype.pokus = function(b){}
var e=  new Folkband();
e.pokus({|});




and invoke cc in place of "|", it offers correctly "a" and "b" and if you pick one, the result is

e.pokus({a});


it would be handy to complete the double colon as well 

e.pokus({a : });



Thank you



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