How NextAuth.js works

I did a write-up and a live stream about how NextAuth.js works at the source level, released as a Tour De Source article in collaboration with Sourcegraph. Huge thanks to the Sourcegraph folks and @Balázs Orbán for reviewing the document. You can check it out at:

• Sourcegraph notebook
• Twitch live stream highlight
• Reddit post

I hope that in the spirit of Hacktoberfest, this document helps you to contribute to NextAuth.js.