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Deferred migration

Deferreds are deprecated in favor of the promise constructor. If you need deferreds for some reason, you can create them trivially using the constructor:

function defer() {
    var resolve, reject;
    var promise = new Promise(function() {
        resolve = arguments[0];
        reject = arguments[1];
    return {
        resolve: resolve,
        reject: reject,
        promise: promise

For old code that still uses deferred objects, see the deprecated API docs .