Added unhandledRejection event #912
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The event "unhandledRejection" was added on process.on because when Promise is rejected and there is no catch
the error will not be thrown and process.on('uncaughtException') won't call for Node10 but it will emit "uncaughtException" for node 16.
So we need to listen to "unhandledRejection" and throw the error to make sure the error is thrown and the result will be similar.
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The event "unhandledRejection" was added on process.on because when Promise is rejected and there is no catch
the error will not be thrown and process.on('uncaughtException') won't call for Node10 but it will emit "uncaughtException" for node 16.
So we need to listen to "unhandledRejection" and throw the error to make sure the error is thrown and the result will be similar.
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The main problem is that when we reject Promises, Node10 and Node16 behaviour is different.
For Node 10, when a promise was rejected without a .catch block will be emitted only unhandledRejection
For Node 16, when a promise was rejected without a .catch block will be emitted unhandledRejection first (if exists), and uncaughtException at the end.
In azure-pipelines-task-lib we handle all uncaughtExceptions and set TaskResult.Failed.
So when we use node16 runner, it emits uncaughtExceptions on Promise rejection and the task fails, and when we use node 10 it does not emit uncaughtExceptions so the task successfully finishes.
The event "unhandledRejection" was added on process.on to emit uncaughtExceptions on node10