Find the open source code for a cmdlet that ships as part of PowerShell Core

Find-PSCmdletSource.cs

function Find-PSCmdletSource {
    [CmdletBinding()]
    [OutputType([string])]
    [Alias('oss')]
    param(
        [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)]
        [ValidateNotNullOrEmpty()]
        [Alias('Name')]
        [string[]]
        $CmdletName,

        [ValidateNotNullOrEmpty()]
        [Alias('Token')]
        [string]
        $GitHubAuthToken,

        [switch]
        $OpenInBrowser = $false
    )
    begin {
        [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
        $baseUri = 'https://api.github.com/search/code'
    }
    process {
        $cmdlet = if ($_ -is [System.Management.Automation.CmdletInfo]) {$_} else {Get-Command -Name $CmdletName -CommandType Cmdlet}
        $cmdletClassName = $cmdlet.ImplementingType.Name
        if ($results = Invoke-RestMethod -Method Get -Uri "${baseUri}?q=`"class+${cmdletClassName}`"+in:file+repo:powershell/powershell") {
            $url = $results.items | Select-Object -ExpandProperty html_url
            if ($OpenInBrowser) {
                Start-Process -FilePath $url
            } else {
                $url
            }
        }
    }
}

gcm Tee-Object | oss -OpenInBrowser