use rx.background, rx.cached_var, and rx.Cookie in the clock example #19

	name: check-export
	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	list-examples:
	runs-on: ubuntu-latest
	outputs:
	examples: ${{ steps.generate-matrix.outputs.examples }}
	steps:
	- uses: actions/checkout@v3
	- name: Generate Matrix
	id: generate-matrix
	run: \|
	# TODO fix sales export
	# TODO fix stable_diffusion export (gets stuck)
	EXAMPLES="$(find . -not -name '.*' -maxdepth 1 -type d \| cut -f2 -d/ \| sort \| grep -vw sales \| grep -vw stable_diffusion \| jq -R \| jq -s -c)"
	echo $EXAMPLES
	echo "examples=$EXAMPLES" >> $GITHUB_OUTPUT

	check-export:
	needs: [list-examples]
	strategy:
	matrix:
	example: ${{ fromJSON(needs.list-examples.outputs.examples) }}
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-python@v3
	- run: \|
	f=${{ matrix.example }}
	if [[ ! -d $f ]]; then
	echo "$f is not a directory!"
	exit 1
	fi

	cd "$f"

	if [[ ! -f requirements.txt ]]; then
	echo "requirements.txt is MISSING"
	exit 1
	fi

	if !( grep -w "^reflex" requirements.txt >/dev/null 2>&1 ); then
	echo "requirements.txt does not contain 'reflex'"
	exit 1
	fi

	python -m venv venv
	source venv/bin/activate

	# pin reflex version - no moving target
	pip install reflex==0.2.7
	pip install -r requirements.txt
	reflex init
	reflex export
	for a in frontend.zip backend.zip; do
	if unzip -t "$a"; then
	echo "$a prepared as expected"
	else
	echo "ERROR: $a is not a valid zip file"
	exit 1
	fi
	done

Provide feedback