TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. It enables JavaScript apps to scale by catching type errors at compile time, enabling intelisense tooling and transpiling modern language features to target ECMAScript version.

📖 Official docs

• Quick start
• Advanced types
• Playground

🔨 Workshops

• Advanced types - part 1 by Pavel Tobiáš (PDF slides, repo)

💬 Talks

• Null checks in TypeScript by Matěj Chalk (Google slides, PDF)

🧪 Exercises

• discriminated union