Pass Azure Devops $(Build.BuildNumber) to npm task - npm

Question

I want to update the package.json version through azure devops pipeline.
This is the task I used. But it throws error.
- task: Npm#1
displayName: "npm version"
command: "custom"
workingDir: src
verbose: false
customCommand: "version $(Build.BuildNumber)"
How to correctly pass the pipeline build number to npm task.
Thanks in advance.

Answer 1

We can use command npm version <newversion> to update the package.json version. for example, current version is v1.0.1, using command npm version 2.0.0 will update its version to v2.0.0. Please note that the version format must be the same, like major.minor.patch.
In addition, yaml pipeline will set the build numer to be formatted like 20210426.5 by default. If your package.json is not formatted like this, this command npm version $(Build.BuildNumber) will cause issues. You could use UpdateBuildNumber to override the automatically generated build number.
BTW, the following yaml pipeline is for your reference supposed that your package.json is formatted like major.minor.patch. Also you could use custom variables to specify the version number.
pool:
vmImage: ubuntu-latest
steps:
- task: PowerShell#2
inputs:
targetType: 'inline'
script: |
# Write your PowerShell commands here.
Write-Host "Hello World"
git config --global user.email "you#example.com"
git config --global user.name "Your Name"
echo "##vso[build.updatebuildnumber]2.1.0"
- task: Npm#1
inputs:
command: 'custom'
workingDir: ''
customCommand: 'version $(Build.BuildNumber)'