fix: Handle uninitialised helpers better #1398

	name: TestCafe
	on: [pull_request]
	env:
	BROWSERSTACK_ACCESS_KEY: "${{ secrets.BROWSERSTACK_ACCESS_KEY }}"
	BROWSERSTACK_USERNAME: "${{ secrets.BROWSERSTACK_USERNAME }}"
	POSTHOG_PROJECT_KEY: "${{ secrets.POSTHOG_PROJECT_KEY }}"
	POSTHOG_API_KEY: "${{ secrets.POSTHOG_API_KEY }}"
	BROWSERSTACK_DEBUG: 'true'
	BROWSERSTACK_NETWORK_LOGS: 'true'
	BROWSERSTACK_CONSOLE: 'info'

	jobs:
	browsers:
	name: Test on ${{ matrix.name }}
	runs-on: ubuntu-latest

	strategy:
	matrix:
	browserstack:
	- chrome
	- ie
	- safari
	include:
	- browserstack: chrome
	name: Chrome
	- browserstack: ie
	name: IE11
	- browserstack: safari
	name: Safari

	steps:
	- name: Check out posthog-js
	uses: actions/checkout@v2

	- name: Set up Node 14
	uses: actions/setup-node@v2
	with:
	node-version: 14

	- name: Serve static files
	run: python -m http.server 8080 &

	- name: Set up posthog-js
	run: yarn && yarn build-rollup

	- name: Run ${{ matrix.name }} test
	run: npx testcafe "browserstack:${{ matrix.browserstack }}" testcafe/*.spec.js

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