Module 8 — Advanced TypeScript

Dive deep into advanced TypeScript type system features. Master mapped types, conditional types, template literals, and inference.

📄️Mapped Types

Build your own TypeScript utility types. Discover how Mapped Types can automate the creation of Getters, Setters, and API wrappers while keeping your code DRY.

📄️Conditional Types

Master TypeScript Conditional Types and the 'infer' keyword. Learn to build type-level if/else logic, extract return types, and unwrap Promises or arrays.

📄️Template Literal Types

Master TypeScript Template Literal Types to build pattern-based string types. Learn to combine unions, enforce naming conventions, and generate dynamic event names.

📄️Advanced Inference

Master TypeScript's inference engine. Explore the four kinds of variance—covariance, contravariance, invariance, and bivariance—and how they impact generic API design.

📄️Hands‑on: Build a type‑safe router or event emitter

Master advanced TypeScript by building a type-safe Event Emitter and Router. Learn to use template literal types and 'infer' to extract parameters from strings.

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Hands‑On Exercise: Migrate a Small JS Module to TS with Minimal Friction

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Mapped Types