Fix stepper: no precheck for undefined variables (#1469) #27

	name: Publish to npm

	on:
	push:
	branches:
	- master

	jobs:
	verify:
	name: Verify should publish
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2
	with:
	ref: master
	submodules: recursive
	- name: Verify version has changed
	# We use jq as `npm pkg get version` returns a quoted string
	run: \|
	if [ "$(cat package.json \| jq -r .version)" == "$(npm view js-slang version)" ]; then
	echo "Version has not changed"
	echo "UPDATE=false" >> "$GITHUB_OUTPUT"
	else
	echo "Version has changed";
	echo "UPDATE=true" >> "$GITHUB_OUTPUT"
	fi
	publish:
	name: Publish to npm
	needs: [verify]
	if: ${{ needs.verify.outputs.UPDATE == 'true' }}
	environment: publish-npm # Await approval from maintainers
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2
	with:
	ref: master
	submodules: recursive
	- name: Setup Node.js
	uses: actions/setup-node@v1
	with:
	node-version: 16
	- name: Install dependencies
	run: yarn install --frozen-lockfile
	- name: Publish to npm
	run: npm publish
	env:
	NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

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