attempt to fix npm cache problem (separate task)

build-packages.yml

@@ -32,7 +32,38 @@ pool:
 
 jobs:
 
+- job: NPMCache
+
+  steps:
+    - checkout: self
+    - checkout: EmptyRepo
+      persistCredentials: true
+      clean: true
+
+    - task: NodeTool@0
+      inputs:
+        versionSpec: "14.x"
+      displayName: "Install Node.js"
+
+    - task: CopyFiles@2
+      inputs:
+        SourceFolder: "$(Build.SourcesDirectory)/survey-library/"
+        Contents: "package.json"
+        TargetFolder: "$(Build.SourcesDirectory)/Temp/"
+        OverWrite: true
+      displayName: "Copy package.json for cache key"
+
+    - task: Cache@2
+      inputs:
+        key: 'npm-cache-library | $(Build.SourcesDirectory)/Temp/package.json'
+        path: $(Build.SourcesDirectory)/survey-library/node_modules
+        cacheHitVar: NPM_CACHE_RESTORED
+      displayName: Cache NPM
+
+
 - job: CoreAngularJquery
+  dependsOn:
+    - NPMCache
 
   steps:
     - checkout: self
@@ -138,6 +169,9 @@ jobs:
 
 
 - job: Knockout
+  dependsOn:
+    - NPMCache
+
   steps:
     - checkout: self
     - checkout: EmptyRepo
@@ -244,6 +278,8 @@ jobs:
 
 
 - job: React
+  dependsOn:
+    - NPMCache
 
   steps:
     - checkout: self
@@ -345,6 +381,8 @@ jobs:
 
 
 - job: Vue
+  dependsOn:
+    - NPMCache
 
   steps:
     - checkout: self
@@ -445,6 +483,9 @@ jobs:
         publishLocation: "Container"
 
 - job: Angular
+  dependsOn:
+    - NPMCache
+
   steps:
     - checkout: self
     - checkout: EmptyRepo
@@ -560,6 +601,9 @@ jobs:
         publishLocation: "Container"
 
 - job: Vue3
+  dependsOn:
+    - NPMCache
+
   steps:
     - checkout: self
     - checkout: EmptyRepo