Use authenticated npmrc

eng/common/pipelines/templates/steps/create-authenticated-npmrc.yml

@@ -0,0 +1,41 @@
+parameters:
+  - name: npmrcPath
+    type: string
+    # When empty, defaults to the agent user's .npmrc ($HOME/.npmrc on
+    # Linux/macOS, %USERPROFILE%\.npmrc on Windows) so every subsequent
+    # npm / pnpm / npx call in the job inherits the registry + auth.
+    default: ""
+  - name: registryUrl
+    type: string
+    default: "https://pkgs.dev.azure.com/azure-sdk/public/_packaging/azure-sdk-for-js/npm/registry/"
+  - name: CustomCondition
+    type: string
+    default: succeeded()
+  - name: ServiceConnection
+    type: string
+    default: ""
+
+steps:
+  - pwsh: |
+      $npmrcPath = '${{ parameters.npmrcPath }}'
+      if (-not $npmrcPath) { $npmrcPath = Join-Path $HOME '.npmrc' }
+
+      Write-Host "Creating .npmrc file $npmrcPath for registry ${{ parameters.registryUrl }}"
+      $parentFolder = Split-Path -Path $npmrcPath -Parent
+
+      if ($parentFolder -and -not (Test-Path $parentFolder)) {
+        Write-Host "Creating folder $parentFolder"
+        New-Item -Path $parentFolder -ItemType Directory | Out-Null
+      }
+
+      "registry=${{ parameters.registryUrl }}" | Out-File $npmrcPath
+      Write-Host "##vso[task.setvariable variable=resolvedNpmrcPath]$npmrcPath"
+    displayName: "Create .npmrc"
+    condition: ${{ parameters.CustomCondition }}
+
+  - task: npmAuthenticate@0
+    displayName: Authenticate .npmrc
+    condition: ${{ parameters.CustomCondition }}
+    inputs:
+      workingFile: $(resolvedNpmrcPath)
+      azureDevOpsServiceConnection: ${{ parameters.ServiceConnection }}

eng/pipelines/templates/install.yml

@@ -17,13 +17,19 @@ steps:
     displayName: Install Node.js
     retryCountOnTaskFailure: 3
 
+  - template: /eng/common/pipelines/templates/steps/create-authenticated-npmrc.yml
+
   - task: Cache@2
     inputs:
       key: 'pnpm | "$(Agent.OS)" | pnpm-lock.yaml'
       path: ${{ parameters.pnpmStorePath }}
     displayName: Cache pnpm store
-  - script: npm install -g pnpm # Pnpm manage-package-manager-versions will respect packageManager field
+
+  - pwsh: |
+      $packageJson = Get-Content -Raw "$(Build.SourcesDirectory)/package.json" | ConvertFrom-Json
+      npm install -g $packageJson.packageManager # Pnpm manage-package-manager-versions will respect packageManager field
     displayName: Install pnpm
+
   - script: pnpm config set store-dir ${{ parameters.pnpmStorePath }}
     displayName: Setup pnpm cache dir