use yarn cache

build/azure-pipelines/darwin/product-build-darwin.yml

@@ -35,10 +35,24 @@ steps:
     git merge $(node -p "require('./package.json').distro")
   displayName: Merge distro
 
+- task: 1ESLighthouseEng.PipelineArtifactCaching.RestoreCacheV1.RestoreCache@1
+  inputs:
+    keyfile: '**/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
+    targetfolder: '**/node_modules, !**/node_modules/**/node_modules'
+    vstsFeed: 'npm-vscode'
+
 - script: |
     set -e
     yarn --frozen-lockfile
   displayName: Install dependencies
+  condition: and(succeeded(), ne(variables['CacheRestored'], 'true'))
+
+- task: 1ESLighthouseEng.PipelineArtifactCaching.SaveCacheV1.SaveCache@1
+  inputs:
+    keyfile: '**/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
+    targetfolder: '**/node_modules, !**/node_modules/**/node_modules'
+    vstsFeed: 'npm-vscode'
+  condition: and(succeeded(), ne(variables['CacheRestored'], 'true'))
 
 - script: |
     set -e

build/azure-pipelines/linux/product-build-linux.yml

@@ -36,10 +36,24 @@ steps:
     git merge $(node -p "require('./package.json').distro")
   displayName: Merge distro
 
+- task: 1ESLighthouseEng.PipelineArtifactCaching.RestoreCacheV1.RestoreCache@1
+  inputs:
+    keyfile: '**/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
+    targetfolder: '**/node_modules, !**/node_modules/**/node_modules'
+    vstsFeed: 'npm-vscode'
+
 - script: |
     set -e
-    CHILD_CONCURRENCY=1 yarn --frozen-lockfile
+    yarn --frozen-lockfile
   displayName: Install dependencies
+  condition: and(succeeded(), ne(variables['CacheRestored'], 'true'))
+
+- task: 1ESLighthouseEng.PipelineArtifactCaching.SaveCacheV1.SaveCache@1
+  inputs:
+    keyfile: '**/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
+    targetfolder: '**/node_modules, !**/node_modules/**/node_modules'
+    vstsFeed: 'npm-vscode'
+  condition: and(succeeded(), ne(variables['CacheRestored'], 'true'))
 
 - script: |
     set -e

build/azure-pipelines/win32/product-build-win32.yml

@@ -35,6 +35,12 @@ steps:
     exec { git merge $(node -p "require('./package.json').distro") }
   displayName: Merge distro
 
+- task: 1ESLighthouseEng.PipelineArtifactCaching.RestoreCacheV1.RestoreCache@1
+  inputs:
+    keyfile: '**/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
+    targetfolder: '**/node_modules, !**/node_modules/**/node_modules'
+    vstsFeed: 'npm-vscode'
+
 - powershell: |
     . build/azure-pipelines/win32/exec.ps1
     $ErrorActionPreference = "Stop"
@@ -42,6 +48,14 @@ steps:
     $env:CHILD_CONCURRENCY="1"
     exec { yarn --frozen-lockfile }
   displayName: Install dependencies
+  condition: and(succeeded(), ne(variables['CacheRestored'], 'true'))
+
+- task: 1ESLighthouseEng.PipelineArtifactCaching.SaveCacheV1.SaveCache@1
+  inputs:
+    keyfile: '**/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
+    targetfolder: '**/node_modules, !**/node_modules/**/node_modules'
+    vstsFeed: 'npm-vscode'
+  condition: and(succeeded(), ne(variables['CacheRestored'], 'true'))
 
 - powershell: |
     . build/azure-pipelines/win32/exec.ps1