Invalid parsing on Windows

[ynshung]

Parses are invalid and test fails on a Windows device because of the imported sep which return \ when the path returned is /. It seems like the path returned defaulted to / on some time. It will cause error such as numerated json file in a folder (0.json, 1.json...) does not result in an array,

If you are facing this issue change const parts = path.split(sep) from sep to "/". Not sure if it applies to other Windows (10) or Node version (mine is v16.13.2).