For Extension frontends

Extension frontends already know a valid token at any time through Twitch's extension helper, and you can make use of it by installing:

yarn add @twurple/auth-ext

or using npm:

npm install @twurple/auth-ext

After that, all you need to provide is a client ID:

import { ExtensionAuthProvider } from '@twurple/auth-ext';

const clientId = 'YOUR_CLIENT_ID';
const authProvider = new ExtensionAuthProvider(clientId);