I want to work with promises but I have a callback API in a format like:

1. DOM load or other one time event:

window.onload; // set to callback
...
window.onload = function() {

};

2. Plain callback:

function request(onChangeHandler) {
    ...
}
request(function() {
    // change happened
    ...
});

3. Node style callback ("nodeback"):

function getStuff(dat, callback) {
    ...
}
getStuff("dataParam", function(err, data) {
    ...
})

4. A whole library with node style callbacks:

API;
API.one(function(err, data) {
    API.two(function(err, data2) {
        API.three(function(err, data3) {
            ...
        });
    });
});

How do I work with the API in promises, how do I "promisify" it?