use strategy matrix

azure-pipelines.yml

@@ -1,46 +1,42 @@
 pool:
-  vmImage: ubuntu-20.04
+  vmImage: ubuntu-18.04
 
-parameters:
-  - name: versionSpec
-    type: object
-    default:
-    - '6.x'
-    - '8.x'
-    - '10.x'
-    - '12.x'
-    - '14.x'
+strategy:
+  matrix:
+    'Node 6': 
+      versionSpec: '6.x'
+    'Node 8': 
+      versionSpec: '8.x'
+    'Node 10': 
+      versionSpec: '10.x'
+    'Node 12': 
+      versionSpec: '12.x'
+    'Node 14': 
+      versionSpec: '14.x'
 
-jobs:
-  - job: build_test_and_publish
-    displayName: Build, test and publish
-    steps:
-    #build on node 8.x
-    - task: NodeTool@0
-      inputs:
-        versionSpec: '8.x'
-      displayName: Install node
+steps:
+- task: NodeTool@0
+  inputs:
+    versionSpec: $(versionSpec)
+  displayName: Install node
 
-    - script: npm install
-      displayName: npm install
+- script: npm install
+  displayName: npm install
 
-    - script: npm run build
-      displayName: npm run build
-    #run unit tests on different node versions
-    - ${{ each version in parameters.versionSpec }}:
-      - task: NodeTool@0
-        inputs:
-          versionSpec: ${{ version }}
-        displayName: Install node
-      - script: npm run units
-        displayName: npm run units
-      - script: npm run test
-        displayName: npm run test
-    #publish if needed
-    - task: PublishBuildArtifacts@1
-      condition: and(succeeded(), in(variables['publishBuild'], 'true'))
-      inputs:
-        PathtoPublish: "_build"
-        ArtifactName: "drop"
-        ArtifactType: "Container"
-      displayName: Publish build artifacts
+- script: npm run build
+  displayName: npm run build
+
+- script: npm run units
+  displayName: npm run units
+
+- script: npm run test
+  displayName: npm run test
+
+#publish if needed
+- task: PublishBuildArtifacts@1
+  condition: and(succeeded(), in(variables['publishBuild'], 'true'))
+  inputs:
+    PathtoPublish: "_build"
+    ArtifactName: "drop"
+    ArtifactType: "Container"
+  displayName: Publish build artifacts