azure-devopsazure-pipelinesyarnpkg-v2

How to install yarn@2 in azure devops pipeline agent

I'm setting up a build pipeline in azure devops. There's an assistant task called YarnInstaller@3 that allows me to install a specific version of Yarn. However, the only available versions listed are 1.x, with the latest being 1.22.

There are migration instructions at https://yarnpkg.com/getting-started/install for migrating from v1 to v2+, which I've done locally. Since only yarn@1.x is available, it seems like I'll have to migrate every time I run a build, e.g.

This seems unnecessary, especially since I've already committed the .yarnrc.yml and the .yarn sub-directories. Am I wrong about that? Is there another way to install yarn@2+ in my pipeline?

Solution

  • You can use the following command lines in your pipeline to update the version of Yarn to 2.x.

    yarn set version berry
yarn set version 2.x

    For more details, you can see:

    Below is the sample pipeline I tested on my side, and it can work as expected. You can reference it and add the related steps in your build pipeline.

      steps:
  . . .

  - task: Bash@3
    displayName: 'Yarn version before update'
    inputs:
      targetType: inline
      script: |
        echo "Yarn version before update:"
        yarn --version
  
  - task: Bash@3
    displayName: 'Update Yarn version to 2.x'
    inputs:
      targetType: inline
      script: |
        yarn set version berry
        yarn set version 2.x

  - task: Bash@3
    displayName: 'Yarn version after update'
    inputs:
      targetType: inline
      script: |
        echo "Yarn version after update:"
        yarn --version