PowerShell script to install latest versions of a package on a certain branch to a target org

Install-LatestPackageVersions.ps1

param(
  [Parameter(Mandatory = $True)]
  [string]$BranchName,
  [Parameter(Mandatory = $True)]
  [string]$TargetOrg
)

$ErrorActionPreference = "Stop"
Import-Module -Force "$PSScriptRoot\Invoke-Sf.psm1"
$PackageNames = Get-PackageNamesInDependencyOrder
$AllPackageVersions = Invoke-SfJson package version list
$BranchPackagesVersions = $AllPackageVersions | Where-Object Branch -EQ $BranchName


function Get-PackageNamesInDependencyOrder {
  $ProjectJson = Get-Content "./sfdx-project.json" | ConvertFrom-Json
  return $ProjectJson.packageDirectories | Where-Object package -NE $null | Select-Object -ExpandProperty package
}
function Get-LatestSubscriberVersionIdForPackage($PackageVersions, $PackageName){
  $SubjectPackageVersions = $PackageVersions | Where-Object Package2Name -EQ $PackageName
  if($SubjectPackageVersions.Count -EQ 0){
    Write-Error "No package versions found for package $PackageName"
    return
  }
  $SubscriberVersionId = $SubjectPackageVersions[-1].SubscriberPackageVersionId
  Write-Host "$($PackageName): $SubscriberVersionId"
  return $SubscriberVersionId
}

$PackageVersionsToInstall = @()
ForEach($PackageName in $PackageNames){
  $PackageVersionsToInstall += Get-LatestSubscriberVersionIdForPackage $BranchPackagesVersions $PackageName
}

scripts/Install-Package.ps1 -Org $TargetOrg -PackageIds $PackageVersionsToInstall