feat: add sideeffects; part 5 #4752

	name: "Css vars"

	on:
	pull_request:
	branches:
	- master

	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	search-vars:
	name: search non-existent css vars

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3

	- name: Install dependencies
	run: yarn --pure-lockfile

	- name: Run build
	run: BUILD_WITHOUT_CSS_VARS=true BUILD_MODERN_ONLY=true yarn build

	- name: run search non-existent css vars
	id: search_vars
	run: node ./bin/non-existent-css-vars.js

	- name: show checking result
	if: ${{ steps.search_vars.outputs.has-non-existent-vars != 'false' }}
	uses: actions/github-script@v6
	with:
	script: \|
	const output = '${{ steps.search_vars.outputs.non-existent-css-vars }}';
	const nonExistentVars = JSON.parse(output);

	core.setFailed('Found non-existent css vars: \n' + Object.keys(nonExistentVars).reduce((acc, key) => {
	acc += key + '\n';

	const vars = nonExistentVars[key];
	vars.forEach(cssVar => acc += ' ' + cssVar + '\n')

	return acc;
	}, ''));

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