Editing an already imported module

Question

Before importing my powershell module (MyModule.psm1), I have written one function in it:

Function T1()
{
    Write-Host "T1 is just called" -ForegroundColor red
}

In my MyModule.psd1:

@{
    PowerShellVersion = '2.0'
    PowerShellHostName = ''
    PowerShellHostVersion = '2.0'
    RequiredModules = @()
    ScriptsToProcess = @()
    NestedModules = @()
    FunctionsToExport = '*'
    CmdletsToExport = '*'
    VariablesToExport = '*'
    ModuleList = @()
    FileList = @()
}

This is imported fine, when I copied both files in:

C:\Users\fwaheed\Documents\WindowsPowerShell\Modules\MyModule

and I'm able to run T1 in my PowerShell session. But now I wanted to add a new function in same module i.e.:

Function T2()
{
    Write-Host "Its now T2.." -ForegroundColor red
}

Even after restarting my PowerShell session, it never recognize T2, however T1 is still working. How can I edit my already imported module such that changes are available immediately.

Westbound

import-module mymodule -force is not enough? – Baecher

Tried that as well, but in vain.. :( – Westbound

Thanks buddy... Just removed the module, Imported again and tried with "import-module MyModule -force" And it worked by adding 4 more functions... – Westbound

Answer 1

Once a module has been imported, changes to it are not recognised since the module is loaded into memory. However, I've always been able to do a Remove-Module foo, followed by an Import-Module foo to load new functions.

All that said, your PSD1 file doesn't look right. It should have a ModuleToProcess field set to 'MyModule.psm1'. Then when you do Import-Module MyModule or Import-Module .\mymodule.psd1, PowerShell will find & load the associated MyModule.psm1 file. I wonder if that is causing you to run afoul of some caching PowerShell does?

Grampositive

Keith, I only posted part of psd1 file which is setting up the Export methodology. It does have ModuleToProcess, or it won't be able to import my module script, Right? – Westbound

That is sort of correct. You have to have that entry to load the PSM1 when your PSD1 is imported. However, you can import-module mymodule.psm1 which bypasses your PSD1. I'm pretty sure though if you do import-module mymodule it will process the PSD1 which would then instruct PowerShell that MyModule.psm1 needs to be loaded. – Grampositive

Answer 2

Use the -Force command with the Import-Module and it will reload it.

Eugenieeugenio

Answer 3

Below is the only solution that worked for me so far, in which you configure vscode to run a new session on each debug, I didnt find any other solution to work and debug Powershell classes.

Tetter