TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received type number (

[SaltySeraphCodes]

Describe the bug

"TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received type number ({machine ID goes here})" Shows up after a successful log on.
This is coming from ...\steam-user\components\logon.js:294:18
when it attempts to save the machine id:
this.storage.saveFile('cellid-' + Helpers.getInternalMachineID() + '.txt', body.cell_id);
I believe node stopped automatically fixing types in a newer update, a simple fix to this would be to convert body.cell_id to a string. I used toString(body.cell_id) as a duct tape fix, but there may be better or more secure ways to do it. I can submit a pull request if you think this is a valid solution 😄

Versions

Node v16.3.0 and Steam-user 4.19.12

Screenshots and Error Logs

[DoctorMcKay]

I think you need to run npm update. That bug should have been fixed a couple years ago in file-manager module version 2.0.0.