Learn TYPESCRIPT with Real Code Examples

Updated Nov 17, 2025

Introduction & Fundamentals Setup & Configuration Architecture & Deep Internals Performance & Security Development Workflow Learning & Career Growth Business & Strategy Examples

Architecture

Compiles to plain JavaScript

Uses the TypeScript compiler (tsc)

Structural (duck-typed) type system

Supports ESM and CommonJS targets

Rendering Model

Transpiles to JavaScript

Type erasure at compile time

Runs on any JS runtime (Node, browser, Deno, Bun)

Architectural Patterns

Type-driven API contracts

Component-driven architectures

Layered backend architectures

Event-driven microservices

Real World Architectures

Next.js fullstack apps

NestJS enterprise APIs

Deno edge runtimes

Bun high-performance tooling

Design Principles

Gradual typing

Compatibility with JavaScript

Tooling-first development

Predictable code behavior

Scalability Guide

Use project references

Break code into modules/packages

Use strictNullChecks

Adopt monorepo toolchains

Migration Guide

Gradually add .ts files to JS codebase

Enable strict mode slowly

Create type definitions for APIs

Refactor to generics and interfaces