How can my script call functions in another scripts in remote session? - powershell

Question

Say I have two scripts:
Script 1:
helper.ps1 with contents:
#helper.ps1
Function foo
{
# do something
}
Script 2:
worker.ps1 with contents:
#worker.ps1
. 'c:\helper.ps1' # This is the correct file location, verified
Write-Output "Starting foo..."
foo
Write-Output "Done"
These two files are already uploaded to the remote server, and I try to run these using remote session with Invoke-Command:
Invoke-Command -ScriptBlock {
param($script)
& $script
} -Args 'worker.ps1'
It turns out most part of worker.ps1 is working correctly, in the above example, we will be able to get the output of line 1 and line 3.
However, it cannot run the function foo, with exception says that it is not function/script/anything, which basically means the helper.ps1 is not loaded correctly:
The term 'foo' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included.
The question is, is this the expected behavior? Can we not load other script in one script using remote session control, even when both files are uploaded and existed in the remote server?
Invoke command below:
Invoke-Command -ScriptBlock {param($script) & $script} -Args 'worker.ps1' .
Exception: The term 'foo' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included. I think Invoke-Command does what it does, since I got other lines executed without problem

Answer 1

I messed with this a bit and found the following to work:
worker.ps1 file:
#worker.ps1
. "c:\helper.ps1"
Write-Output "Starting foo..."
foo
Write-Output "Done"
helper.ps1 file:
#helper.ps1
Write-Host "Loading foo function..."
Function foo
{
# do something
Write-Host "The foo is alive!"
}
Write-Host "Foo loaded"
Command on remote system:
Invoke-Command -ScriptBlock {param($script) & $script} `
-ArgumentList 'c:\Worker.ps1' -ComputerName Machine
Output:
Loading foo function...
Foo loaded
Starting foo...
The foo is alive!
Done
So it may just be an issue with the single quotes instead of double quotes around the filename. I was able to execute the Invoke-Command block from two different systems to this machine and had the same results on both. (All my systems are running PS v4 so you may see different results on PS v3.)