publish-npm.yml

name: Publish to npm

on:
  push:
    branches:
      - main

jobs:
  verify:
    name: Publish if pkg version changed
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          ref: main
          submodules: recursive

      - name: Get package version
        id: get_pkg_version
        run: echo "pkg_version=$(cat package.json | jq -r .version)" >> "$GITHUB_OUTPUT"

      - name: Get npm version
        id: get_npm_version
        run: echo "npm_version=$(npm view java-slang version)" >> "$GITHUB_OUTPUT"

      - name: Stop if version has not changed
        if: steps.get_pkg_version.outputs.pkg_version == steps.get_npm_version.outputs.npm_version
        run: exit 1

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20
          registry-url: https://registry.npmjs.org/

      - name: Install dependencies
        run: yarn install --frozen-lockfile

      - name: Build
        run: yarn build

      - name: Publish to npm
        run: npm publish
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}