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Based on the official roadmap.sh TypeScript roadmap and best practices, here’s a comprehensive list of topics and steps to follow master TypeScript:

TypeScript Mastery Roadmap

1. Prerequisites

  • JavaScript Fundamentals
    • Variables: let, const, var
    • Data types: String, Number, Boolean, Object, Array
    • Functions and Arrow Functions
    • Control structures: if/else, switch, loops
    • ES6+ features: destructuring, spread/rest, template literals
    • Asynchronous programming: Promises, async/await

2. TypeScript Basics

  • Introduction & Setup

    • What is TypeScript and why use it?
    • Installing TypeScript
    • Setting up tsconfig.json
    • Compiling and running TypeScript (tsc, ts-node)
    • Using TypeScript Playground

  • Primitive Types

    • boolean, number, string, void, undefined, null

  • Type Annotations

    • Variables, functions, parameters, return types

  • Object Types

    • Interfaces
    • Type Aliases
    • Classes
    • Enums
    • Arrays & Tuples

  • Type Assertions

    • as keyword
    • Non-null assertion
    • as const
    • satisfies keyword

3. Intermediate TypeScript

  • Combining Types

    • Union Types
    • Intersection Types

  • Type Guards & Narrowing

    • typeof
    • Truthiness
    • Equality
    • instanceof
    • Type predicates

  • Type Inference & Compatibility

    • How TypeScript infers types
    • Type compatibility and assignability

  • Functions

    • Typing functions
    • Function overloading

  • Interfaces vs Types

    • Differences and use cases
    • Extending interfaces
    • Hybrid types

  • Classes

    • Constructors
    • Access modifiers: public, private, protected
    • Abstract classes
    • Inheritance & polymorphism
    • Method overriding

  • Key TypeScript Operators

    • keyof, typeof, in

4. Advanced TypeScript

  • Generics

    • Generic types and functions
    • Generic constraints

  • Utility Types

    • Partial, Pick, Omit, Readonly, Record, Exclude, Extract, NonNullable, Parameters, ReturnType, InstanceType, Awaited

  • Advanced Types

    • Mapped types
    • Conditional types
    • Literal types
    • Template literal types
    • Recursive types

  • Decorators (experimental, used in frameworks like Angular)

5. Modules and Namespaces

  • Modules

    • Import/export syntax
    • Ambient modules
    • External modules

  • Namespaces

    • Namespace and global augmentation

6. Ecosystem & Tooling

  • TypeScript and JavaScript Interoperability

    • Using JS libraries in TS
    • Declaration files (.d.ts)
    • DefinitelyTyped and @types packages

  • Linting & Formatting

    • ESLint, Prettier

  • Build Tools

    • Webpack, Babel, ts-loader

  • Useful Packages

    • Explore community-recommended libraries

7. Best Practices & Real-World Usage

  • Structuring large TypeScript projects
  • Type safety in APIs and third-party libraries
  • Migrating JavaScript projects to TypeScript
  • Testing TypeScript code

8. Continue Learning

  • Backend Roadmap (Node.js with TypeScript)
  • Frontend Roadmap (React, Angular, Vue with TypeScript)
  • Explore advanced patterns, open source projects, and community resources

Summary Table

Stage Topics
Prerequisites JS basics, ES6+, async/await
Basics Setup, primitive types, type annotations, interfaces, classes, enums, arrays, tuples, assertions
Intermediate Unions/intersections, type guards, inference, function typing, interfaces vs types, classes, operators
Advanced Generics, utility types, mapped/conditional/recursive/template types, decorators
Modules Modules, namespaces, augmentation
Ecosystem JS interop, declaration files, linting, formatting, build tools, packages
Best Practices Project structure, migration, testing, real-world patterns
Continue Backend/frontend with TS, open source, community

Tip:
For the most detailed and up-to-date roadmap, always refer to the [official roadmap.sh TypeScript roadmap].