GitHub Action to set the current version to a package.json. Places the set version into a context variable for later reference.

In a GitHub Workflow that runs after pushing a tag:

name: Auto-version on tag

on:
  push:
    tags:
      - '*'

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Set version
        id: package_version
        uses: KageKirin/set-node-package-version@v0
        with:
          version: ${{ github.ref_name }}

      - name: Commit new version
        run: |
          git commit -am "CI: update version from tag"
          git push https://${{ github.token }}@github.com/OWNER/REPO

This represents the path to the package.json to set the version number to. It defaults to package.json, but you might need to adapt it if the file is named differently, or lies in a subfolder.

This is the Regular Expression used to verify the version. It defaults to an equivalent of major.minor.patch and requires all 3 integers to be present.

This is the version string to write into the package. It must match the provided regex format.

This the version string as retrieved from the package.json after writing to the file.

The action will fail if:

• it can't open the file
• it fails to retrieve the version element
• the version string does not match the provided regex