Use emitter-package-lock.json and @Local feed view (Azure#38325)

Co-authored-by: Patrick Hallisey <pahallis@microsoft.com>

Author: azure-sdk

eng/common/scripts/TypeSpec-Project-Generate.ps1

@@ -46,14 +46,36 @@ function NpmInstallForProject([string]$workingDirectory) {
         Write-Host("Copying package.json from $replacementPackageJson")
         Copy-Item -Path $replacementPackageJson -Destination "package.json" -Force
 
+        #default to root/eng/emitter-package-lock.json but you can override by writing
+        #Get-${Language}-EmitterPackageLockPath in your Language-Settings.ps1
+        $emitterPackageLock = Join-Path $PSScriptRoot "../../emitter-package-lock.json"
+        if (Test-Path "Function:$GetEmitterPackageLockPathFn") {
+            $emitterPackageLock = &$GetEmitterPackageLockPathFn
+        }
+
+        $usingLockFile = Test-Path $emitterPackageLock
+
+        if ($usingLockFile) {
+            Write-Host("Copying package-lock.json from $emitterPackageLock")
+            Copy-Item -Path $emitterPackageLock -Destination "package-lock.json" -Force
+        }
+
         $useAlphaNpmRegistry = (Get-Content $replacementPackageJson -Raw).Contains("-alpha.")
 
         if($useAlphaNpmRegistry) {
             Write-Host "Package.json contains '-alpha.' in the version, Creating .npmrc using public/azure-sdk-for-js-test-autorest feed."
-            "registry=https://pkgs.dev.azure.com/azure-sdk/public/_packaging/azure-sdk-for-js-test-autorest/npm/registry/ `n`nalways-auth=true" | Out-File '.npmrc'
+            "registry=https://pkgs.dev.azure.com/azure-sdk/public/_packaging/azure-sdk-for-js-test-autorest@local/npm/registry/ `n`nalways-auth=true" | Out-File '.npmrc'
+        }
+
+        if ($usingLockFile) {
+            Write-Host "> npm ci"
+            npm ci
+        }
+        else {
+            Write-Host "> npm install"
+            npm install
         }
 
-        npm install --no-lock-file
         if ($LASTEXITCODE) { exit $LASTEXITCODE }
     }
     finally {

eng/common/scripts/common.ps1

@@ -61,6 +61,7 @@ $GetRepositoryLinkFn = "Get-${Language}-RepositoryLink"
 $GetEmitterAdditionalOptionsFn = "Get-${Language}-EmitterAdditionalOptions"
 $GetEmitterNameFn = "Get-${Language}-EmitterName"
 $GetEmitterPackageJsonPathFn = "Get-${Language}-EmitterPackageJsonPath"
+$GetEmitterPackageLockPathFn = "Get-${Language}-EmitterPackageLockPath"
 
 # Expected to be set in eng/scripts/docs/Docs-Onboarding.ps1
 $SetDocsPackageOnboarding = "Set-${Language}-DocsPackageOnboarding"