Clear Teams' cache & optionally persist settings

Clear-TeamsCache.ps1

function Clear-TeamsCache {
    [CmdletBinding(SupportsShouldProcess = $true)]
    param (
        # Determine if settings should persist after clearing cache
        [Parameter()]
        [switch]
        $PersistSettings
    )

    begin {
        $cacheFolderPath = "$($env:APPDATA)\Microsoft\Teams"
        Write-Verbose "Cache folder identified as: $cacheFolderPath"

        $settingsFile = "$cacheFolderPath\desktop-config.json"
        Write-Verbose "Settings file identified as: $settingsFile"
    }

    process {
        Write-Verbose "Getting Teams process"
        $proc = Get-Process 'Teams' -ErrorAction SilentlyContinue

        Write-Verbose "Stopping Teams process"
        $proc | Stop-Process

        if ($PersistSettings -eq $true) {
            $config = Get-Content -Path $settingsFile | ConvertFrom-Json -ErrorAction SilentlyContinue
            Write-Verbose "Captured existing settings in memory"
        }

        Write-Verbose "Removing cache"
        $cacheItems = Get-ChildItem $cacheFolderPath
        $cacheItems | Remove-Item -Recurse -Force

        if ($PersistSettings -eq $true) {
            Write-Verbose "Attempting to apply existing settings"
            $config | ConvertTo-Json -Compress | Set-Content -Path $settingsFile -Force
        }

        $startProcessArgs = @{
            FilePath     = "$($env:LOCALAPPDATA)\Microsoft\Teams\Update.exe"
            ArgumentList = '--processStart "Teams.exe"'
        }

        Write-Verbose "Starting Teams back up"
        Start-Process  @startProcessArgs
    }
}