fix: undefined is not a function #1270

	name: Lint JavaScript

	on:
	pull_request:
	types: [opened, synchronize]

	jobs:
	lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- uses: actions/cache@v2
	with:
	path: ~/.npm
	key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
	restore-keys: \|
	${{ runner.os }}-node-

	- name: Setup Node
	uses: actions/setup-node@v1
	with:
	node-version: '20.x'

	- run: npm ci

	- run: npm run lint
	env:
	CI: true

	- name: Verify there's no Prettier diff
	run: \|
	npm run prettier -- --loglevel silent
	if ! git diff --name-only --exit-code; then
	# shellcheck disable=SC2016
	echo 'Error: Prettier diff detected! Please run `npm run prettier` and commit the changes.'
	exit 1
	fi

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