Implementation:
function unwrap(value) {
return Promise.resolve(value).then(v => isPromise(v) ? unwrap(v) :
v);
}
Promise.when = value => unwrap(value);
Test:
var promise = new Promise(r => {
r.fulfill(new Promise(r => { r.fulfill(1); }));
});
promise.then(val => console.log(val.then ? "promise" : "value"));
Promise.when(promise).then(val => console.log(val.then ? "promise" :
"value"));
>> promise
>> value
{ Kevin }
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