How to properly use the -verbose and -debug parameters in a custom cmdlet

Question

By default, any named function that has the [CmdletBinding()] attribute accepts the -debug and -verbose (and a few others) parameters and has the p

Answer 1

There is no need. PowerShell already does this as the code below proves.

function f { [cmdletbinding()]Param()    
    "f is called"
    Write-Debug Debug
    Write-Verbose Verbose
}
function g { [cmdletbinding()]Param() 
    "g is called"
    f 
}
g -Debug -Verbose

The output is

g is called
f is called
DEBUG: Debug
VERBOSE: Verbose

It is not done as direct as passing -Debug to the next cmdlet though. It is done through the $DebugPreference and $VerbrosePreference variables. Write-Debug and Write-Verbose act like you would expect, but if you want to do something different with debug or verbose you can read here how to check for yourself.