A convenient global error handler

error.js

(function(scope, console, CustomEvent) {
 
    var error = scope.error = function() {
        var output = []
        for (var i=0; i<arguments.length; i++) {
            var arg = arguments[i];
            if (typeof arg === "object" && arg.length) {
                output.push.apply(output, Array.prototype.slice.call(arg));
            } else {
                output.push(arg);
            }
        }
        if (typeof error.target === "function") {
            error.target.apply(scope, output);
        } else if (scope.alert) {
            scope.alert('Error: '+output.join(', '));
        }
        if (CustomEvent && typeof scope.dispatchEvent === "function") {
            if (output.length === 1) {
                output = output[0];
            }
            scope.dispatchEvent(new CustomEvent("error", {
                detail: output
            }));
        }
    };
    error.target = console ? (console.error||console.log).bind(console) : null;
 
})(this, this.console, this.CustomEvent);