Changing "export def" to "export extern" to not shadow the original
command as it would disallow anything not defined in the re-definition
There seem to be similar cases in completions for (naive search with "rg
'export def'")
- mask
- winget (exports some defs and some externs. So i dont know if those
defs are actually additional functionality)
- pnpm (only exports some 'nu-complete' defs)
- pass (only exports some 'nu-complete' defs)
I don't feel comfortable changing those as i am not familiar with them.