We found this bug from a report of our use of Zone.js in the Application Insights Node.js SDK causing generator functions to not get called: microsoft/ApplicationInsights-node.js#267

Native promises in Node.js support taking the result of a generator function as an argument to Promise.all, and wait for all yielded promises to complete. For example:

var generator = function*() {
    yield Promise.resolve('1');
    yield Promise.resolve('2');
    yield Promise.resolve('3');
    return;
};

Promise.all(generator()).then(val=>{
    console.log(val);
})

will print out [ '1', '2', '3' ]. This breaks when including zone into the project.

The code for the ZoneAwarePromise.all method correctly uses a for-of loop to iterate its value (see

However, the compiled source, for zone-node at least, converts this into a standard for loop iterating an index against value.length (see

The end result is executing the code sample above with zone.js included is getting the following printed out: []