Improve range split function and add unit tests #1121

	name: Typecheck, lint and test
	on:
	pull_request:
	merge_group:
	branches:
	- main
	push:
	branches:
	- main

	jobs:
	check:
	if: github.repository == 'Expensify/react-native-live-markdown'
	runs-on: ubuntu-latest
	concurrency:
	group: check-root-${{ github.ref }}
	cancel-in-progress: true
	steps:
	- name: Check out Git repository
	uses: actions/checkout@v4

	- name: Use Node.js 18
	uses: actions/setup-node@v4
	with:
	node-version: 18

	- name: Install node_modules
	run: npm ci

	- name: Typecheck library
	run: npm run typecheck -- --project tsconfig.json

	- name: Typecheck example app
	run: npm run typecheck -- --project example/tsconfig.json

	- name: Typecheck WebExample app
	run: npm run typecheck -- --project WebExample/tsconfig.json

	- name: Lint
	run: npm run lint

	- name: Test
	run: npm run test

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