Runs npm prune + dedupe + update on all subdirectories that have a package.json

npm-update-children.ps1

function Exec
{
    [CmdletBinding()]
    param (
        [Parameter(Position=0, Mandatory=1)]
        [scriptblock]$Command,
        [Parameter(Position=1, Mandatory=0)]
        [string]$ErrorMessage = "Execution of command failed.`n$Command"
    )
    & $Command
    if ($LastExitCode -ne 0) {
        throw "Exec: $ErrorMessage"
    }
}

Get-ChildItem -Depth 1 | where { $_.name -eq "package.json" } | ForEach-Object {
  $dirName = (Split-Path ($_.DirectoryName) -Leaf);
  Write-Host "Updating ${dirName}:";
  Push-Location $_.DirectoryName;
  Exec { npm prune }
  Exec { npm dedupe }
  Exec { npm update }
  Exec { git gc }
  Pop-Location;
}