name: npm-publish
on:
  push:
    branches:
      - master # Change this to your default branch
jobs:
  npm-publish:
    name: npm-publish
    runs-on: ubuntu-latest
    steps:
    - name: Checkout repository
      uses: actions/checkout@master
    - name: Set up Node.js
      uses: actions/setup-node@master
      with:
        node-version: 10.0.0
    - name: Publish if version has been updated
      uses: pascalgn/npm-publish-action@4f4bf159e299f65d21cd1cbd96fc5d53228036df
      with: # All of theses inputs are optional
        tag_name: "v%s"
      env: # More info about the environment variables in the README
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # Leave this as is, it's automatically generated
        NPM_AUTH_TOKEN: ${{ secrets.NPM_AUTH_TOKEN }} # You need to set this in your repo settings

Add github action for publishing to npm
Add github action for publishing to npm

Add action for publishing to npm