TypeScript Mastery
JavaScript with Superpowers
Master TypeScript from first principles types, interfaces, generics, utility types, mapped types, and the patterns every TypeScript developer needs to know.
45+
Topics
225+
Exercises
180+
Quiz Questions
Free
Forever
Learning Paths
Beginner
Core TypeScript: basic types, inference, interfaces, type aliases, functions, classes, unions, generics, utility types, narrowing, and mapped/conditional types.
0/15 done
Intermediate
Advanced generics, template literals, infer, recursive types, mixins, decorators, .d.ts files, module augmentation, async patterns, error handling, index signatures, discriminated unions, tsconfig, runtime validation, and best practices.
0/15 done
Advanced
Variance and covariance, nominal typing with brands, type-level arithmetic, const type parameters, NoInfer, builder pattern, type-state pattern, higher-kinded types, variadic tuples, monorepos with project references, React advanced patterns, performance optimization, inference tricks, dependency injection, Compiler API, and testing patterns.
0/15 done
Latest Topics
Introduction to TypeScript
What TypeScript is, why it exists, and how to set up and compile your first TypeScript project.
Basic Types
string, number, boolean, null, undefined, any, unknown, never, void and when to use each.
Type Inference
How TypeScript automatically deduces types from context and when to add explicit annotations.
Arrays and Tuples
Typed arrays (string[], Array<T>), readonly arrays, fixed-length tuples, and rest elements.
Enums
Numeric enums, string enums, const enums, and when to use union types instead.
Interfaces
Define object shapes with interface optional properties, readonly, extending, and declaration merging.
What's Covered
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