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lib: fix event race condition with -e
Commit c5b07d4 ("lib: fix beforeExit not working with -e") runs the to-be-evaluated code at a later time than before because it switches from `process.nextTick()` to `setImmediate()`. It affects `-e 'process.on("message", ...)'` because there is now a larger time gap between startup and attaching the event listener, increasing the chances of missing early messages. I'm reasonably sure `process.nextTick()` was also susceptible to that, only less pronounced. Avoid the problem altogether by evaluating the code synchronously. Harmonizes the logic with `Module.runMain()` from lib/module.js which also calls `process._tickCallback()` afterwards. PR-URL: #11958 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com> Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
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