[iudqnolq]

How can it detect termin background color?

[jwalton]

This is the function they are using to detect the background color:

https://github.com/muesli/termenv/blob/d1b90ad4a4915162648dd...

(There’s a different version of it for Windows.)

[de6u99er]

The windows one just returns default black, which is correct in most cases since very few change it to something else.

https://github.com/muesli/termenv/blob/d1b90ad4a4915162648dd...

[bradrn]

This is not entirely true: Windows Powershell defaulted to a blue background. Though this is admittedly an edge case, as Windows Powershell is now deprecated in favour of Powershell Core (which has a black background) IIRC.