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On Linux machines with no USB bus (often containers), /sys/bus/usb/devices doesn't exist. nusb reports that as an error, so getDevices, findDeviceByIds and findDeviceBySerial all rejected. addEventListener's initial device list had no catch, which caused an unhandled rejection.
kevinmehall
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Oct 15, 2026
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| // A Linux machine without a USB bus (often a container) has no | ||
| // /sys/bus/usb/devices. That means there are no devices, not that listing failed. | ||
| fn is_missing_usb_bus(e: &nusb::Error) -> bool { | ||
| cfg!(target_os = "linux") | ||
| && e.os_error().is_some_and(|code| { | ||
| std::io::Error::from_raw_os_error(code as i32).kind() == std::io::ErrorKind::NotFound | ||
| }) | ||
| } |
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I'd probably just do list_devices().wait().map_or(Vec::new(), |devices| devices.collect()) instead of testing for the specific error, since if you don't want it to fail in that case, you probably don't want it to fail in other cases either.
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Changes
On Linux machines with no USB bus (often containers), /sys/bus/usb/devices doesn't exist. nusb reports that as an error, so getDevices, findDeviceByIds and findDeviceBySerial all rejected. addEventListener's initial device list had no catch, which caused an unhandled rejection.
Fixes
I am not 100% sure on some of the TS error changes, but the
setTimeout(() => { throw error; }, 0)will always manifest as an uncaughtException unless the application sets up a handler for those errors, in which it is common to exit the application as a means to recover.Checklist
Have you...
See bitfocus/companion#4522 for the original error