##[error]Error: No package found with specified pattern: /home/vsts/work/1/a/**/*.zip
Check if the package mentioned in the task is published as an artifact in the build or a previous stage and downloaded in the current job.

- task: DownloadBuildArtifacts@1
  inputs:
    buildType: 'current'
    downloadType: 'single'
    artifactName: 'drop'
    itemPattern: '**/*.zip'
    downloadPath: '$(System.ArtifactsDirectory)'

# Node.js
# Build a general Node.js project with npm.
# Add steps that analyze code, save build artifacts, deploy, and more:
# https://docs.microsoft.com/azure/devops/pipelines/languages/javascript
variables:
  # Azure service connection established during pipeline creation
  azureSubscription: '<azure-subscription-name>'
  appName: '<azure-function-app-name>'

trigger:
- master

pool:
  vmImage: ubuntu-latest

steps:
- task: NodeTool@0
  inputs:
    versionSpec: '16.x'
  displayName: 'Install Node.js'
- script: |
    if [ -f extensions.csproj ]
    then
        dotnet build extensions.csproj --output ./bin
    fi
    npm install 
    npm run build --if-present
    npm prune --production  
- task: ArchiveFiles@2
  displayName: "Archive files"
  inputs:
    rootFolderOrFile: "$(System.DefaultWorkingDirectory)"
    includeRootFolder: false
    archiveFile: "$(System.DefaultWorkingDirectory)/build$(Build.BuildId).zip"
- task: PublishBuildArtifacts@1
  inputs:
    PathtoPublish: '$(System.DefaultWorkingDirectory)/build$(Build.BuildId).zip'
    artifactName: 'drop'
- task: DownloadBuildArtifacts@1
  inputs:
    buildType: 'current'
    downloadType: 'single'
    artifactName: 'drop'
    itemPattern: '**/*.zip'
    downloadPath: '$(System.ArtifactsDirectory)'
- task: AzureFunctionApp@1
  inputs:
    azureSubscription: $(azureSubscription)
    appType: functionAppLinux # default is functionApp
    appName: $(appName)
    package: '$(System.DefaultWorkingDirectory)/**/*.zip'
    runtimeStack: 'NODE|16' # this is optional
    deploymentMethod: 'auto' # auto is default
    #Uncomment the next lines to deploy to a deployment slot
    #Note that deployment slots is not supported for Linux Dynamic SKU
    #deployToSlotOrASE: true
    #resourceGroupName: '<Resource Group Name>'
    #slotName: '<Slot name>'