Cache and restor npm packages

Author: mattbrailsford

azure-pipelines.yml

@@ -1,6 +1,10 @@
 name: $(TeamProject)_$(Build.DefinitionName)_$(SourceBranchName)_$(Date:yyyyMMdd)$(Rev:.r)
 
 parameters:
+  - name: cache_npm
+    displayName: Cache NPM packages
+    type: boolean
+    default: true
   - name: cache_nuget
     displayName: Cache NuGet packages
     type: boolean
@@ -19,6 +23,7 @@ stages:
   - stage: Build
     variables:
       NUGET_PACKAGES: $(Pipeline.Workspace)/.nuget/packages
+      npm_config_cache: $(Pipeline.Workspace)/.npm_client
     jobs:
       - job: Build
         pool: 
@@ -32,11 +37,27 @@ stages:
           - task: NuGetAuthenticate@1
             displayName: Authenticate NuGet
 
+          - task: NodeTool@0
+            displayName: Use Node.js $(nodeVersion)
+            inputs:
+              versionSpec: $(nodeVersion)
+
           - task: UseDotNet@2
             displayName: Use .NET SDK from global.json
             inputs:
               useGlobalJson: true
 
+          # Cache and restore NPM packages
+          - task: Cache@2
+            condition: ${{ parameters.cache_npm }}
+            displayName: Cache NPM packages
+            inputs:
+              key: 'npm | "$(Agent.OS)" | **/package-lock.json, !**/node_modules/**'
+              restoreKeys: |
+                npm | "$(Agent.OS)"
+                npm
+              path: $(npm_config_cache)
+
           # Cache and restore NuGet packages
           - task: Cache@2
             condition: ${{ parameters.cache_nuget }}