internal/functions/Assert-GraphConnection.ps1

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function Assert-GraphConnection
{
<#
    .SYNOPSIS
        Asserts a valid graph connection has been established.
     
    .DESCRIPTION
        Asserts a valid graph connection has been established.
     
    .PARAMETER Cmdlet
        The $PSCmdlet variable of the calling command.
     
    .EXAMPLE
        PS C:\> Assert-GraphConnection -Cmdlet $PSCmdlet
     
        Asserts a valid graph connection has been established.
#>

    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        $Cmdlet
    )
    
    process
    {
        if ($script:msgraphToken) { return }
        
        $exception = [System.InvalidOperationException]::new('Not yet connected to MSGraph. Use Connect-AzureADUserAuthenticationMethod to establish a connection!')
        $errorRecord = [System.Management.Automation.ErrorRecord]::new($exception, "NotConnected", 'InvalidOperation', $null)
        
        $Cmdlet.ThrowTerminatingError($errorRecord)
    }
}