Improve detection of task process exit#10776
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Our build script waits for the `close` event to determine whether the task has exited. The `exit` event is a better representation of this, because if a stream is shared between multiple processes, the process may exit without the `close` event being emitted. We aren't sharing streams between processes, so this edge case doesn't apply to us. This just seemed like a more suitable event to listen to, since we care about the process exiting not the stream ending. See this description of the `close` event from the Node.js documentation [1]: >The `'close'` event is emitted when the stdio streams of a child >process have been closed. This is distinct from the `'exit'` event, >since multiple processes might share the same stdio streams. And see this description of the `exit` event: >The `'exit'` event is emitted after the child process ends. [1]: https://nodejs.org/docs/latest-v14.x/api/child_process.html#child_process_event_exit
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Our build script waits for the
closeevent to determine whether the task has exited. Theexitevent is a better representation of this, because if a stream is shared between multiple processes, the process may exit without thecloseevent being emitted.We aren't sharing streams between processes, so this edge case doesn't apply to us. This just seemed like a more suitable event to listen to, since we care about the process exiting not the stream ending.
See this description of the
closeevent from the Node.js documentation:And see this description of the
exitevent: