Prevents npm publish if version already exists #4

	name: Publish to npm

	on:
	push:
	branches:
	- main
	workflow_dispatch:

	permissions:
	id-token: write
	contents: read

	jobs:
	check-version:
	runs-on: ubuntu-latest
	outputs:
	should_publish: ${{ steps.check.outputs.should_publish }}
	version: ${{ steps.read_version.outputs.version }}
	steps:
	- uses: actions/checkout@v4

	- name: Read version from package.json
	id: read_version
	run: echo "version=$(jq -r '.version' package.json)" >> $GITHUB_OUTPUT

	- name: Check if version exists on npm
	id: check
	run: \|
	echo "Checking npm for version ${{ steps.read_version.outputs.version }}"

	EXISTS=$(npm view $(jq -r '.name' package.json) versions --json \| jq -e '.[] \| select(.=="'${{ steps.read_version.outputs.version }}'")' \|\| echo "no")

	if [ "$EXISTS" = "no" ]; then
	echo "should_publish=true" >> $GITHUB_OUTPUT
	else
	echo "should_publish=false" >> $GITHUB_OUTPUT
	fi

	publish:
	needs: check-version
	if: needs.check-version.outputs.should_publish == 'true'
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- uses: actions/setup-node@v4
	with:
	node-version: '25'
	registry-url: 'https://registry.npmjs.org'
	scope: \@${{ github.repository_owner }}

	- name: Update npm
	run: npm install -g npm@latest

	- run: npm ci
	- run: npm run build

	- name: Publish package
	run: npm publish --access public

	skip-notice:
	needs: check-version
	if: needs.check-version.outputs.should_publish == 'false'
	runs-on: ubuntu-latest
	steps:
	- name: Version already published
	run: echo "Version ${{ needs.check-version.outputs.version }} already exists on npm. Skipping publish."

Provide feedback