This is a basic streak counter - inspired by Duolingo - written in Typescript
meant for the browser (uses LocalStorage).
npm install @jonaskinnvall/streak-counter
yarn add @jonaskinnvall/streak-counter
import { streakCounter } from '@jonaskinnvall/streak-counter'
const today = new Date()
const streak = streakCounter(localstorage, today)
// streak returns an object:
// {
// currentCount: 1,
// lastLoginDate:'28/10/2022',
// startDate:'28/10/2022'
// }