Fix PowerShell Export-ModuleMember error preventing developer mode enablement 15297

[Nitin-100]

Description

Type of Change

Erase all that don't apply.

• Bug fix (non-breaking change which fixes an issue)

Why

The build fails to enable developer mode during yarn react-native run-windows with a PowerShell error: "Export-ModuleMember : The Export-ModuleMember cmdlet can only be called from inside a module." This occurs because WindowsStoreAppUtils.ps1 contains Export-ModuleMember calls but is imported as a script rather than a module. The Export-ModuleMember cmdlet can only be used inside PowerShell modules (.psm1 files), not regular scripts (.ps1 files). This prevents the EnableDevmode function from being accessible, blocking app deployment and developer mode enablement.

Resolves #15297

What

• Renamed WindowsStoreAppUtils.ps1 to WindowsStoreAppUtils.psm1 to make it a proper PowerShell module
• Updated the file reference in deploy.ts from .ps1 to .psm1 extension
• This allows PowerShell's Import-Module command to correctly load the module and makes all exported functions (EnableDevmode, Install-App, etc.) accessible

Screenshots

After(Fixed State) and Before(Broken state):

PS> Import-Module WindowsStoreAppUtils.psm1
SUCCESS: Module imported successfully

PS> Get-Command EnableDevmode
Name
----
EnableDevmode'''



Export-ModuleMember : The Export-ModuleMember cmdlet can only be called from inside a module.
At D:\Bugs\react-native-windows\packages\@react-native-windows\cli\src\powershell\WindowsStoreAppUtils.ps1:455 char:1
+ Export-ModuleMember -Function @(
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~'''

[protikbiswas100]

LGTM