Create rollback-yarn-1.16.0.ps1

scripts/rollback-yarn-1.16.0.ps1

@@ -0,0 +1,32 @@
+function GetUninstallString($productName) {
+    $x64items = @(Get-ChildItem "HKLM:SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall")
+    ($x64items + @(Get-ChildItem "HKLM:SOFTWARE\wow6432node\Microsoft\Windows\CurrentVersion\Uninstall") `
+        | ForEach-object { Get-ItemProperty Microsoft.PowerShell.Core\Registry::$_ } `
+        | Where-Object { $_.DisplayName -and $_.DisplayName.Contains($productName) } `
+        | Select UninstallString).UninstallString
+}
+
+$uninstallCommand = GetUninstallString "Yarn"
+
+if ($uninstallCommand) {
+    Write-Host "Uninstalling existing installation of Yarn ..." -ForegroundColor Cyan
+
+    $uninstallCommand = $uninstallCommand.replace('MsiExec.exe /I{', '/x{').replace('MsiExec.exe /X{', '/x{')
+    cmd /c start /wait msiexec.exe $uninstallCommand /quiet
+
+    Write-Host "Uninstalled" -ForegroundColor Green
+}
+
+Write-Host "Installing Yarn ..." -ForegroundColor Cyan
+$msiPath = "$($env:TEMP)\yarn.msi"
+
+Write-Host "Downloading..."
+(New-Object Net.WebClient).DownloadFile('https://github.com/yarnpkg/yarn/releases/download/v1.16.0/yarn-1.16.0.msi', $msiPath)
+
+Write-Host "Installing..."
+cmd /c start /wait msiexec /i $msiPath /quiet /qn
+del $msiPath
+
+Write-Host "Yarn installed" -ForegroundColor Green
+
+yarn --version