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TypeScript Complete Roadmap (Beginner to Advanced) — 2025 Edition

#typescript #webdev #programming #learning

Welcome to the most complete TypeScript roadmap you'll ever need.

This guide is structured chapter-wise, includes beginner to advanced topics, real-world practices, and is ideal for:

  • 📘 Students (like BCA, CS, Bootcamps)
  • 💻 Full Stack Developers
  • ⚙️ TypeScript Learners
  • 💼 Interview Preparation

✅ Why This Roadmap?

  • 🧱 Structured Chapter-wise Learning
  • 🔄 Real-World Use Cases
  • 🧪 Practice Projects & Interview Questions
  • 🔥 Covers All: class, interface, generics, DOM, Node, React, and more!

📘 Chapter-wise TypeScript Roadmap

📘 Chapter 1: Introduction to TypeScript

  • What is TypeScript?
  • Benefits over JavaScript
  • Use-Cases & Compilation
  • TypeScript vs JavaScript

⚙️ Chapter 2: Setup & Compilation

  • Install TypeScript globally
  • Local project setup with tsc
  • tsconfig.json explained
  • Compile .ts to .js
  • Use ts-node, nodemon

🔤 Chapter 3: Type System Basics

👉 Primitive Types:

string, number, boolean, null, undefined, symbol, bigint

👉 Non-Primitive Types:

object, array, function, tuple, map, set, class, interface

👉 Special Types:

any, unknown, void, never

✍️ Chapter 4: Type Annotations & Inference

  • Variable annotations
  • Function params & return types
  • Array & object typing
  • Type inference and best practices

🔁 Chapter 5: Type Aliases, Union & Intersection

  • type keyword
  • Union (|) and Intersection (&) types
  • Literal types
  • Reusability with aliases

📦 Chapter 6: Interfaces

  • Basic interface
  • Optional/readonly properties
  • Function types
  • Extending interfaces
  • Index signatures & merging
  • Interface vs Type

🔠 Chapter 7: Enums & Literal Types

  • Numeric & string enums
  • Const enums
  • Literal types for constraints

🔢 Chapter 8: Arrays & Tuples

  • Typed arrays
  • Tuples with fixed types & lengths
  • Optional tuple elements

⚙️ Chapter 9: Functions in TypeScript

  • Function types
  • Optional & default parameters
  • Function overloads
  • Arrow functions
  • this context in TS

🧰 Chapter 10: Utility Types

  • Partial, Required, Readonly
  • Pick, Omit, Record, ReturnType, Parameters, Exclude, Extract

🧱 Chapter 11: Classes & OOP

  • Class declaration
  • Access modifiers: public, private, protected
  • readonly, static, and this
  • Inheritance
  • Method overriding
  • Polymorphism

🧬 Chapter 12: Abstract Classes & Polymorphism

  • Abstract classes = blueprint/template
  • Abstract methods
  • Real-world examples

📖 Chapter 13: Generics

  • Generic functions <T>
  • Generic classes & interfaces
  • Constraints (<T extends ...>)
  • Default generic values

🧠 Chapter 14: Advanced Types

  • Type guards (typeof, instanceof)
  • Discriminated union types
  • keyof, typeof, in, as
  • Conditional types
  • Template literal types
  • Recursive types

📁 Chapter 15: Modules & Namespaces

  • import, export, file structure
  • Aliases and grouping
  • Legacy namespace support

🧾 Chapter 16: Declaration Files (.d.ts)

  • Writing and using .d.ts
  • Global types
  • Third-party libraries (@types/...)

🌍 Chapter 17: DOM with TypeScript

  • HTMLElement, HTMLInputElement, Event types
  • querySelector, addEventListener
  • Safe DOM access, assertions

⚒️ Chapter 18: Working with Frameworks

✅ React + TS

  • Props, state, events
  • Custom types for components
  • useState, useRef, useEffect with types

✅ Node.js + Express

  • Typed route handlers
  • Middleware typing
  • Typed request, response, next

🔄 Chapter 19: Best Practices

  • When to use interface vs type
  • Avoiding any, preferring unknown
  • Breaking large types into modules
  • Consistent type declaration styles

🧪 Chapter 20: Projects & Practice

  • ✅ Todo App with full type safety
  • ✅ Auth System (JWT + Express)
  • ✅ Axios API Client using generics
  • ✅ Form Validator (DOM + Utility types)
  • ✅ Blog CRUD (Node + TS)

🎯 Chapter 21: Interview Questions & MCQs

  • interface vs type
  • never vs void
  • unknown vs any
  • Real-world patterns and best practices
  • Type system deep dive

📚 Chapter 22: Resources

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