Practitioner

Level: Practitioner | Labs: 15 | Prerequisites: TypeScript basics, Node.js

This track builds solid TypeScript skills from the type system foundations through real-world application patterns. Complete all 15 labs to master practitioner-level TypeScript.

---

Lab Index

#	Lab	Topic	Key Skills
01	Type System Deep Dive	Core type system	Union types, intersection types, type narrowing, typeof/instanceof
02	Generics	Generic programming	Generic functions, classes, constraints, default types
03	Advanced Interfaces & Types	Structural typing	Interface merging, extends, implements, optional/readonly
04	Decorators	Decorator pattern	Class, method, property, parameter decorators
05	Async TypeScript	Async patterns	async/await, typed Promises, error handling in async
06	Strict Mode & Null Safety	Strictness	strictNullChecks, non-null assertion, optional chaining
07	Enums & Namespaces	Value types	const enum, string enums, namespace organization
08	Advanced Classes	OOP patterns	Abstract classes, access modifiers, static members, mixins
09	Modules & Paths	Module system	ES modules, path aliases, barrel exports, import type
10	Type Guards & Assertions	Type narrowing	Custom type guards, assertion functions, discriminated unions
11	Zod Runtime Validation	Schema validation	z.object, z.infer, safeParse, error formatting
12	Express + TypeScript	REST APIs	Typed routes, request/response types, middleware types
13	Testing with Vitest	Testing	describe/it/expect, typed mocks, coverage
14	tsconfig Advanced	Compiler config	strict, paths, lib, target, compiler options
15	Capstone: Typed API	Integration project	Full typed REST API with validation, tests, strict mode

---

Learning Path

Lab 01-02: Type fundamentals
    ↓
Lab 03-05: Advanced patterns
    ↓
Lab 06-09: Real-world TypeScript
    ↓
Lab 10-12: Libraries & frameworks
    ↓
Lab 13-14: Quality & config
    ↓
Lab 15: Capstone project

Next Steps

After completing this track, continue with the TypeScript Advanced track to master conditional types, compiler API, FP patterns, DI, and enterprise architecture.