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Why are my Node.js child processes not exiting cleanly?

Child processes might hang due to open streams or unhandled I/O. Ensure all data is flushed, and explicitly close streams or use `process.exit()` to force an exit if necessary.

When child processes in Node.js don’t exit cleanly, it’s often because they still have open I/O streams (stdin, stdout, stderr) or unresolved tasks. This prevents the process from terminating. To handle this, make sure to close all streams and handle any pending I/O operations properly by listening for the close event. If the child process is still hanging, you can explicitly call process.exit() with the appropriate exit code, but this should be a last resort, as it can abruptly terminate ongoing tasks. Properly handling the lifecycle of child processes ensures they exit cleanly once their work is done, freeing up resources and preventing leaks.

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