asap.sub.js

var asap = require("asap")

asap.sub = function (onerror) {
    var parent = this;
    
    var self = function (task) {
        parent(function () {            
            try {
                task();
                
            } catch (e) {
                if (self.onerror) {
                    self.onerror(e);
                } else {
                    throw e;
                }
            }
        });
    };
    
    self.onerror = onerror;
    self.sub = parent.sub;
    return self;
};

module.exports = asap.sub.bind(asap);

index.js

// asap for easier debugging in browsers.
var asap = require("asap.sub")(function (e) {
    if (typeof window !== "undefined") {
        if (window.console && console.error) {
            console.error(e);
            return;
        }
    }
    throw e;
});