Use null prototype for map values #1069

	name: CI

	on: [push, pull_request]

	jobs:
	build:
	runs-on: ubuntu-latest

	services:
	postgres:
	image: postgres:9.6.17
	env:
	POSTGRES_PASSWORD: postgres
	ports:
	- 5432:5432

	steps:
	- uses: actions/[email protected]
	- name: Use Node 16
	uses: actions/[email protected]
	with:
	node-version: "16.x"
	- name: Cache node modules
	uses: actions/[email protected]
	with:
	path: "**/node_modules"
	key: ${{ runner.os }}-build-${{ hashFiles('**/yarn.lock') }}
	- name: Install Dependencies and Test
	run: yarn install
	- name: Build
	run: yarn run build
	- name: Lint
	run: yarn run lint
	- name: Test
	run: yarn run test
	env:
	PORT: 12000
	PGHOST: 127.0.0.1
	PGUSER: postgres
	PGPASSWORD: postgres
	PGPORT: 5432
	PGSSL: false

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