Promise.onuncatched

Called if the promise wasnt catched.

Sample

var p = new Promise(function (resolve, reject) {
    reject("Failed!");
});
p.onuncatched = function (e) {
    alert ("No-one catched this error: " + e);
}

Result:

Since neither then(x, f), catch(f) or finally(f) was called with valid function f, the alert would be fired.