TypeScript

Master TypeScript type annotations, generics, utility types, classes, modules, configuration, React & Node integration — 117 topics across 14 chapters.

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117

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14

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1

TypeScript Fundamentals

9 topics

0% done

1What is TypeScript? Why TypeScript?2Setting Up TypeScript — tsc, tsconfig.json 3Type Annotations — Primitives 4Type Inference 5Arrays & Tuples 6Enums — Numeric, String, const Enums 7Any, Unknown, Never, Void 8Type Assertions & Non-Null Assertion (!)9Literal Types & const Assertions

2

Functions in TypeScript

8 topics

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1Typing Function Parameters & Return Types 2Optional & Default Parameters 3Rest Parameters 4Function Overloads 5Typing Callbacks & Higher-Order Functions 6void vs undefined Return Types 7Typing this in Functions 8Typing Arrow Functions vs Function Declarations

3

Objects & Interfaces

8 topics

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1Object Type Annotations 2Interfaces — Defining & Implementing 3Optional & Readonly Properties 4Index Signatures 5Extending Interfaces 6Interface vs Type Alias — When to Use Which 7Declaration Merging 8Hybrid Types (Callable Interfaces)

4

Type System Deep Dive

8 topics

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1Union Types 2Intersection Types 3Type Guards — typeof, instanceof, in, custom type predicates 4Discriminated Unions (Tagged Unions)5Type Narrowing (Control Flow Analysis)6Type Aliases vs Interfaces (Detailed Comparison)7Recursive Types 8Branded Types / Nominal Typing

5

Generics

9 topics

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1Introduction to Generics — Why?2Generic Functions 3Generic Interfaces & Types 4Generic Classes 5Generic Constraints — extends 6Default Type Parameters 7Multiple Type Parameters 8Conditional Types with Generics 9Variance — Covariance & Contravariance

6

Advanced Types

9 topics

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1Mapped Types — Partial, Required, Readonly, Record 2Conditional Types — infer Keyword 3Template Literal Types 4Utility Types — Pick, Omit, Exclude, Extract, NonNullable, ReturnType, Parameters 5keyof & typeof Operators 6Indexed Access Types 7Creating Custom Utility Types 8Distributive Conditional Types 9Satisfies Operator

7

Classes in TypeScript

9 topics

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1Class Basics — Properties & Methods 2Access Modifiers — public, private, protected 3Readonly Properties 4Parameter Properties (Constructor Shorthand)5Abstract Classes & Methods 6Implementing Interfaces in Classes 7Static Members 8Class Decorators (Stage 3)9Mixins with TypeScript

8

Modules & Namespaces

8 topics

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1ES Modules in TypeScript 2Module Resolution — Node, Bundler, Classic 3Path Aliases & baseUrl 4Declaration Files (.d.ts)5Definitely Typed (@types/*)6Global Declarations & Ambient Modules 7Namespaces (Legacy & When to Use)8Module Augmentation

9

TypeScript Configuration

8 topics

0% done

1tsconfig.json — Deep Dive 2Strict Mode & Strict Flags 3Target & Module Options 4Path Mapping & Project References 5Incremental Compilation 6Watch Mode & Build Mode 7Source Maps 8ESLint & Prettier with TypeScript

10

TypeScript with React

10 topics

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1Typing Component Props 2Typing useState, useEffect, useRef 3Typing Event Handlers 4Generic Components 5Typing Context API 6Typing Custom Hooks 7Typing forwardRef & useImperativeHandle 8Typing Higher-Order Components (HOCs)9Typing Render Props 10Typing Redux / Zustand Stores

11

TypeScript with Node.js

7 topics

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1Setting Up Node.js with TypeScript 2Typing Express Routes, Middleware & Request/Response 3Typing Environment Variables (process.env)4Typing Database Queries (Prisma, Drizzle, Knex)5Typing API Responses (Zod, io-ts)6Building a REST API with TypeScript 7Monorepo Setup with TypeScript (Turborepo)

12

Error Handling & Patterns

7 topics

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1Typing Error Objects 2Custom Error Classes 3Result Pattern (Ok / Err)4Either Pattern 5Exhaustive Checking with never 6Assertion Functions 7Type-Safe Error Boundaries

13

Advanced TypeScript Patterns

10 topics

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1Builder Pattern with Types 2Type-Safe Event Emitters 3Type-Safe State Machines 4Type-Level Programming 5Phantom Types 6Type-Safe Routing 7Opaque / Branded Types in Practice 8Variadic Tuple Types 9const Type Parameters 10Module Pattern with TypeScript

14

TypeScript Interview

7 topics

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1Top 50 TypeScript Interview Questions 2Type Challenges (Easy → Hard)3Utility Type Implementation Questions 4Generic Problem-Solving Questions 5Real-World Typing Scenarios 6TypeScript vs JavaScript Comparison Questions 7tsconfig Debugging Questions