Fix value is null #542

	name: Formating
	on: pull_request
	jobs:
	extract:
	name: prettier
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: set user
	run: \|
	git config --global user.name 'GitHub Actions'
	git config --global user.email '[email protected]'
	# use node module caching
	- uses: actions/cache@v2
	with:
	path: '**/node_modules'
	key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}

	- name: install packages
	run: corepack enable && yarn install --immutable

	- name: prettier
	run: yarn prettier --check .

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