TypeScript Full Topics

✅ I. TypeScript Basics (Foundations)

• What is TypeScript? Why use it?
• Installing TypeScript
• Configuring tsconfig.json
• Running TypeScript files
• TypeScript vs JavaScript
• Type Annotations: string, number, boolean
• Variables: let, const
• Functions with typed parameters and return types
• Arrays and Tuples typing
• Object typing
• Type Inference
• Union Types
• Literal Types
• any type
• Type Aliases
• Type Assertions (Type Casting)
• Enums
• Basic Error Handling

✅ II. Intermediate TypeScript (Core Concepts)

• Optional Parameters
• Default Parameters
• Rest Parameters
• Function Overloading
• Structural Typing (Duck Typing)
• Narrowing Types (Type Guards)
• typeof and instanceof checks
• never type
• Interfaces (Basic)
• Interfaces vs Type Aliases
• Extending Interfaces
• Readonly Properties
• Index Signatures
• Optional Chaining (?.)
• Nullish Coalescing (??)
• Intersection Types (&)
• Discriminated Unions
• Type Literals
• Mapped Types (Basic)

✅ III. Advanced TypeScript

• Introduction to Generics
• Generic Functions
• Generic Interfaces
• Generic Classes
• Constraining Generics (extends keyword)
• Default Generic Types
• Utility Types: Partial, Required, Readonly, Record, Pick, Omit, Exclude, Extract, NonNullable, ReturnType, Parameters
• Declaration Merging
• Key Remapping in Mapped Types
• Recursive Types
• Template Literal Types
• Index Access Types

✅ IV. Working with Classes & OOP

• Classes in TypeScript
• Access Modifiers: public, private, protected
• Readonly Properties in Classes
• Getters & Setters
• Abstract Classes
• Interfaces vs Abstract Classes
• Static Properties & Methods
• Inheritance in TypeScript

✅ V. TypeScript with Modules & Namespaces

• Import and Export Syntax
• Working with TypeScript Namespaces
• ES6 vs TypeScript Module Syntax

✅ VI. Advanced TypeScript Patterns

• Conditional Types
• Type Predicates
• Infer Keyword
• Complex Mapped Types
• Utility Types in Custom Scenarios

✅ VII. Working with External Libraries

• Using DefinitelyTyped (@types)
• Writing Type Declarations
• Type Declarations for JS Libraries
• Working with third-party types

✅ VIII. TypeScript Configuration & Build

• Deep Dive into tsconfig.json
• Strict Mode
• Type Checking Best Practices
• TypeScript Paths Aliases
• Project References
• Using TypeScript with Babel

✅ IX. TypeScript with React

• Typing React Functional Components
• Typing Props and State
• Typing React Events
• Typing Hooks (useState, useEffect)
• Typing Context API
• Typing Refs
• Generics in React Components
• Forms with TypeScript
• Conditional Rendering with TypeScript

✅ X. TypeScript with Node.js

• Setting up Node.js + TypeScript
• Typing Express Applications
• Typing Middleware
• Working with Async/Await (Typed)
• Working with Environment Variables
• Typing APIs

✅ XI. TypeScript Project Best Practices

• Folder Structure for TypeScript Projects
• Code Splitting
• Consistent Type Declarations
• Enabling strictNullChecks
• Linting with ESLint + TypeScript
• TypeScript with Prettier
• Unit Testing with TypeScript
• Using tsconfig-paths
• Error Handling Patterns

✅ Bonus: Highly Advanced Topics (Optional)

• TypeScript Compiler API
• Custom Transformers
• Working with Monorepos (Lerna / Nx)
• Building Typed Libraries
• TypeScript in Microservices