Deploying yarn using a deployment script

.deployment

[config]
SCM_COMMAND_IDLE_TIMEOUT=300
command = azure-deploy.cmd

azure-deploy.cmd

:: 3. Install npm packages
IF EXIST "%DEPLOYMENT_TARGET%\package.json" (
  pushd "%DEPLOYMENT_TARGET%"

  :: 1. Yarn Installation
  echo Checking yarn installation...
  call yarn --version
  IF !ERRORLEVEL! NEQ 0 (
    echo Installing Yarn...
    !NPM_CMD! install -g yarn
    IF !ERRORLEVEL! NEQ 0 goto error
  ) ELSE (
    echo Yarn is installed
  )

  call :ExecuteCmd yarn install
  call :ExecuteCmd yarn build
  IF !ERRORLEVEL! NEQ 0 goto error
  popd
)