Ngcc relies on cluster for distributing work. The master controller sends messages to the workers as soon as the worker becomes `online`. The online event is sent as part of the NodeJS cluster logic itself. This does not work well because technically `online` could emit before the worker started listening (this seems to be case now with ESM as the imports are loaded in a way where `online` emits too early; before the worker actually listens for messages). We fix this by explicitly notifying the master when the worker is ready for retrieving IPC messages/or tasks. This is more safe anyway as it's not clearly specified when `online` emits. PR Close #43431
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