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20 SECTIONS · 419 TOPICS

Typescript Roadmap

  1. TypeScript Types and Syntax

    1. 1. Type Annotations and Type Inference
    2. Example: Type annotations vs inference
    3. 2. Primitive Types (string, number, boolean, null, undefined)
    4. Example: Primitive type usage
    5. 3. Literal Types and Template Literal Types
    6. Example: Literal types for type safety
    7. 4. Array Types (T[]) and Tuple Types
    8. Example: Arrays and tuples
    9. 5. Object Types and Index Signatures
    10. Example: Object types and index signatures
    11. 6. Union Types (|) and Intersection Types (&)
    12. Example: Union types for flexibility
    13. Example: Intersection types for composition
    14. 7. any, unknown, never, and void Types
    15. any vs unknown
    16. void vs never
    17. Example: any vs unknown
    18. Example: never and void

  2. TypeScript Advanced Type System

    1. 1. Type Aliases (type) vs Interface Declarations
    2. Type vs Interface
    3. Example: Type alias
    4. Example: Interface
    5. Example: Type aliases vs interfaces
    6. 2. Enum Types and Const Enums
    7. Example: Enum types
    8. 3. Type Assertions (as keyword and angle-bracket syntax)
    9. Example: Type assertions
    10. 4. Type Guards and Type Narrowing Techniques
    11. Example: Built-in type guards
    12. Example: User-defined type guards
    13. 5. Discriminated Unions and Tagged Unions
    14. Example: Discriminated unions for safe state management
    15. 6. Mapped Types and Key Remapping
    16. Example: Mapped types
    17. 7. Conditional Types and Built-in Utility Types
    18. Example: Conditional types
    19. Key Takeaways

  3. TypeScript Generics

    1. 1. Generic Functions (
    2. Example: Generic functions
    3. Example: Generic methods in classes
    4. 2. Generic Interfaces and Generic Classes
    5. Example: Generic interfaces
    6. Example: Generic classes
    7. 3. Generic Constraints (extends keyword)
    8. Example: Generic constraints
    9. 4. Default Generic Parameters
    10. Example: Default generic parameters
    11. 5. Conditional Types with infer Keyword
    12. Example: infer keyword usage
    13. 6. Variance and Covariance in Generics
    14. Variance Rules
    15. Array Variance
    16. Example: Covariance - return types
    17. Example: Contravariance - parameter types
    18. Example: Invariance - mutable containers
    19. Generics Best Practices

  4. TypeScript Utility Types

    1. 1. Partial
    2. Example: Partial<T> for optional properties
    3. Example: Required<T> to enforce completeness
    4. 2. Pick
    5. Example: Pick<T, K> to select properties
    6. Example: Omit<T, K> to exclude properties
    7. 3. Record
    8. Example: Record<K, T> for dictionaries
    9. Example: keyof for type-safe property access
    10. 4. Exclude
    11. Example: Exclude<T, U> to remove types
    12. Example: Extract<T, U> to filter types
    13. 5. ReturnType
    14. Example: ReturnType<T> for type inference
    15. Example: Parameters<T> for parameter types
    16. 6. NonNullable
    17. Example: NonNullable<T> for type safety
    18. Example: InstanceType<T> for constructor types
    19. Example: Awaited<T> for Promise unwrapping
    20. Utility Types Reference
    21. Property Modifiers
    22. Property Selection
    23. Union Manipulation
    24. Function Types
    25. Class Types

  5. TypeScript Interfaces

    1. 1. Interface Declaration and Extension (extends keyword)
    2. Example: Basic interface declaration
    3. Example: Interface extension
    4. 2. Optional Properties (?) and readonly Modifier
    5. Example: Optional properties
    6. Example: Readonly properties
    7. 3. Function Types and Method Signatures in Interfaces
    8. Example: Method signatures
    9. Example: Call and construct signatures
    10. Example: Method overloading in interfaces
    11. 4. Index Signatures ([key: string]: type) for Dynamic Properties
    12. Example: String index signatures
    13. Example: Number and advanced index signatures
    14. 5. Interface Merging and Declaration Merging
    15. Example: Declaration merging
    16. Example: Module and global augmentation
    17. 6. Implementing Interfaces in Classes (implements keyword)
    18. Example: Basic interface implementation
    19. Example: Generic interface implementation
    20. Example: Combining inheritance and interfaces
    21. Interface Design Best Practices

  6. TypeScript Classes and OOP

    1. 1. Class Declaration and Constructor Functions
    2. Example: Basic class declaration
    3. Example: Generic classes
    4. 2. Property Declaration and Initialization
    5. Example: Property initialization patterns
    6. 3. Access Modifiers (public, private, protected, readonly)
    7. Example: Access modifiers
    8. Example: Protected members in inheritance
    9. 4. Static Members and Static Initialization Blocks
    10. Example: Static members
    11. Example: Static initialization blocks
    12. 5. Abstract Classes and Abstract Methods
    13. Example: Abstract classes
    14. 6. Class Inheritance (extends keyword) and super Keyword
    15. Example: Class inheritance
    16. Example: Inheritance chain
    17. 7. Getters (get) and Setters (set) with Type Safety
    18. Example: Getters and setters
    19. Example: Advanced accessor patterns
    20. 8. Parameter Properties Shorthand Syntax
    21. Example: Parameter properties (before/after)
    22. Example: Parameter properties with modifiers
    23. OOP Best Practices

  7. TypeScript Functions

    1. 1. Function Type Expressions and Call Signatures
    2. Example: Function type expressions
    3. Example: Call signatures
    4. 2. Function Overloading and Implementation Signatures
    5. Example: Function overloading
    6. Example: Advanced overloading patterns
    7. 3. Optional Parameters (?) and Default Parameter Values
    8. Example: Optional parameters
    9. Example: Default parameters
    10. 4. Rest Parameters (...args: T[]) and Spread Syntax
    11. Example: Rest parameters
    12. Example: Spread syntax
    13. 5. this Parameter and Explicit this Types
    14. Example: Explicit this parameter
    15. Example: this type utilities
    16. 6. Arrow Functions and Lexical this Binding
    17. Example: Arrow function this binding
    18. Example: Arrow function patterns
    19. Function Best Practices

  8. TypeScript Advanced Type Manipulation

    1. 1. Mapped Types ([K in keyof T]) and Key Remapping (as keyword)
    2. Example: Basic mapped types and modifiers
    3. Example: Key remapping with template literals
    4. Example: Filtering properties with conditional remapping
    5. 2. Template Literal Types and String Manipulation Types
    6. Example: Creating event name types
    7. Example: String manipulation utilities
    8. 3. Recursive Types and Recursive Conditional Types
    9. Example: Basic recursive types
    10. Example: Deep readonly and partial
    11. Example: Path string type for nested objects
    12. 4. Higher-Order Types and Type-level Programming
    13. Example: Type-level utilities
    14. Example: Tuple and array manipulation
    15. Example: Type-level arithmetic (simplified)
    16. 5. Brand Types and Nominal Typing Patterns
    17. Example: Basic branding with symbols
    18. Example: Branded primitive types
    19. Example: Phantom types for state machines
    20. 6. Type-only Imports (import type) and Exports (export type)
    21. Example: Type-only imports
    22. Example: Inline type imports (TS 4.5+)
    23. Example: Breaking circular dependencies
    24. Example: Type-only exports
    25. Advanced Type Manipulation Summary

  9. TypeScript Type Guards

    1. 1. typeof and instanceof Type Guards
    2. Example: typeof type guards
    3. Example: instanceof type guards
    4. 2. User-Defined Type Guards (is keyword)
    5. Example: Basic type predicates
    6. Example: Narrowing unknown types
    7. Example: Generic type guards
    8. 3. Assertion Functions (asserts keyword)
    9. Example: Basic assertion functions
    10. Example: Non-null assertions
    11. Example: Complex type assertions
    12. 4. Discriminated Union Type Guards
    13. Example: Basic discriminated unions
    14. Example: API response handling
    15. Example: Multiple discriminants
    16. 5. in Operator for Property Existence Checking
    17. Example: Basic in operator narrowing
    18. Example: Complex union narrowing
    19. Example: Combining with other guards
    20. 6. Control Flow Analysis and Type Narrowing
    21. Example: Truthiness and equality narrowing
    22. Example: Control flow with early returns
    23. Example: Assignment and control flow
    24. Example: Complex control flow scenarios
    25. Type Guards Summary

  10. TypeScript Modules and Declarations

    1. 1. ES Module Syntax (import/export) in TypeScript
    2. Example: Named exports and imports
    3. Example: Default exports and mixed exports
    4. Example: Re-exports and barrel exports
    5. Example: Namespace imports and dynamic imports
    6. 2. CommonJS Interoperability (require and module.exports)
    7. Example: CommonJS export patterns
    8. Example: Importing CommonJS in TypeScript
    9. Example: TypeScript compiled to CommonJS
    10. 3. Module Resolution Strategies (Node, NodeNext, Classic)
    11. Example: Node resolution strategy
    12. Example: Node16/NodeNext resolution
    13. Example: Path mapping and baseUrl
    14. 4. Declaration Files (.d.ts) and Type Declarations
    15. Example: Basic declaration file
    16. Example: Module declaration files
    17. Example: Generating declaration files
    18. Example: @types packages
    19. 5. Ambient Module Declarations (declare module)
    20. Example: Ambient module declarations
    21. Example: Wildcard module declarations for assets
    22. Example: Module augmentation
    23. Example: Global augmentation from module
    24. 6. Triple-Slash Directives (///
    25. Example: Triple-slash path references (legacy)
    26. Example: Reference types directive
    27. Example: Reference lib directive
    28. Example: Advanced triple-slash usage
    29. Module System Summary

  11. TypeScript 5.x Modern Features (2024-2026)

    1. 1. const Type Parameters and const Assertions (as const)
    2. Example: const type parameters
    3. Example: const assertions (as const)
    4. Example: Practical const patterns
    5. 2. satisfies Operator for Type Checking
    6. Example: satisfies vs type annotation
    7. Example: Practical satisfies patterns
    8. Example: Complex satisfies scenarios
    9. 3. using Declaration for Resource Management
    10. Example: Basic using declaration
    11. Example: Async disposal with await using
    12. Example: Practical resource management patterns
    13. 4. Decorator Metadata and Reflect API
    14. Example: Modern decorators with metadata (TS 5.0+)
    15. Example: Reflect Metadata API (legacy approach)
    16. Example: Design-time type reflection
    17. 5. Import Attributes and JSON Modules
    18. Example: JSON module imports
    19. Example: CSS and other module types
    20. Example: Typed JSON imports
    21. 6. Node16/NodeNext Module Resolution
    22. Example: Node16/NodeNext configuration
    23. Example: Dual package (CJS + ESM)
    24. Example: Subpath exports and patterns
    25. TypeScript 5+ Features Summary

  12. TypeScript Async Programming

    1. 1. Promise
    2. Example: Basic Promise types
    3. Example: async/await syntax
    4. Example: Promise combinators
    5. 2. Typing Async Functions and Return Types
    6. Example: Async function return types
    7. Example: Generic async functions
    8. Example: Async function types
    9. 3. Awaited
    10. Example: Awaited utility type
    11. Example: Practical Awaited usage
    12. Example: PromiseSettledResult types
    13. 4. Error Handling in Async Code (try/catch with types)
    14. Example: try/catch with async/await
    15. Example: Result type pattern
    16. Example: Error types and custom errors
    17. 5. Generator Functions (function*) and AsyncGenerator
    18. Example: Generator functions
    19. Example: Async generators
    20. Example: Generator type parameters
    21. 6. Callback Types and Event Handler Typing
    22. Example: Callback function types
    23. Example: Event handler types
    24. Example: Promisify callbacks
    25. Asynchronous Programming Summary

  13. TypeScript Configuration (tsconfig.json)

    1. 1. tsconfig.json File Structure and Options
    2. Example: Basic tsconfig.json Structure
    3. 2. Compiler Options and Strict Mode (strict: true)
    4. Example: Strict Mode Configuration
    5. 3. Path Mapping (paths) and baseUrl Configuration
    6. Example: Path Mapping Configuration
    7. 4. Include/Exclude Patterns and File Selection
    8. Example: File Selection Patterns
    9. 5. Project References and Composite Projects
    10. Example: Project References Setup
    11. 6. Build Mode (--build) and Incremental Compilation
    12. Example: Incremental Build Configuration
    13. Configuration and Compiler Options Summary

  14. TypeScript with React, Vue, Angular, Node.js

    1. 1. React TypeScript (React.FC, Props, useState, useEffect)
    2. Example: Function components with props
    3. Example: Event handlers and refs
    4. Example: Hooks with TypeScript
    5. 2. Vue.js TypeScript (Composition API, defineComponent, ref, computed)
    6. Example: Vue 3 Composition API with TypeScript
    7. Example: Props and emits with types
    8. 3. Angular TypeScript (@Component, @Injectable, Decorators)
    9. Example: Angular component with TypeScript
    10. Example: Angular service with dependency injection
    11. 4. Node.js TypeScript (@types/node, process, Buffer)
    12. Example: Node.js modules with TypeScript
    13. 5. Express.js TypeScript (Request, Response, NextFunction)
    14. Example: Express routes with TypeScript
    15. Example: Typed middleware
    16. 6. Next.js TypeScript (API Routes, getServerSideProps, getStaticProps)
    17. Example: Next.js pages with data fetching
    18. Example: Next.js API routes
    19. Framework Integration Summary

  15. TypeScript Testing

    1. 1. Jest TypeScript (ts-jest, @types/jest) Configuration
    2. Example: Jest configuration for TypeScript
    3. Example: Writing typed tests with Jest
    4. 2. Type-only Tests (expect-type, tsd, @ts-expect-error)
    5. Example: Type-only tests with expect-type
    6. Example: Negative type tests
    7. 3. Mock Typing (jest.Mock
    8. Example: Typed mocks with Jest
    9. Example: Module mocking with types
    10. 4. Test Coverage and Type Coverage (type-coverage) Analysis
    11. Example: Jest coverage configuration
    12. Example: Type coverage analysis
    13. 5. Property-Based Testing (fast-check) with TypeScript
    14. Example: Property-based testing with fast-check
    15. Example: Custom arbitraries for complex types
    16. 6. Contract Testing and API Type Validation (Zod, io-ts)
    17. Example: Zod schema validation
    18. Example: Contract testing with OpenAPI
    19. Example: MSW for API mocking
    20. Testing and Quality Assurance Summary

  16. TypeScript Build Tools and Performance

    1. 1. TypeScript Compilation Performance Tuning
    2. Example: Performance-optimized tsconfig.json
    3. Example: Performance diagnostics
    4. Example: Large project optimizations
    5. 2. Incremental Builds (--incremental) and Project References
    6. Example: Monorepo with project references
    7. Example: Build commands
    8. 3. Bundle Analysis and Tree Shaking with TypeScript
    9. Example: Tree-shakeable library structure
    10. Example: Bundle analysis with Webpack
    11. 4. Webpack (ts-loader, babel-loader) TypeScript Integration
    12. Example: Webpack with ts-loader (production)
    13. Example: Fast development config
    14. 5. Vite TypeScript and HMR (Hot Module Replacement)
    15. Example: Vite configuration with TypeScript
    16. Example: TypeScript config for Vite
    17. 6. esbuild and SWC Fast TypeScript Compilation
    18. Example: esbuild configuration
    19. Example: SWC configuration
    20. Example: Performance comparison
    21. Performance and Build Tools Summary

  17. TypeScript IDE and Development Tools

    1. 1. VS Code TypeScript Features and Extensions
    2. Example: VS Code settings for TypeScript
    3. Example: Useful VS Code keyboard shortcuts
    4. 2. ESLint TypeScript (@typescript-eslint/parser, @typescript-eslint/eslint-plugin)
    5. Example: ESLint configuration for TypeScript
    6. Example: Popular TypeScript ESLint rules
    7. 3. Prettier TypeScript Formatting Configuration
    8. Example: Prettier configuration
    9. Example: Format on save and pre-commit
    10. 4. TypeScript Language Server (tsserver) and LSP Protocol
    11. Example: Language server configuration
    12. Example: Language server plugins
    13. 5. Refactoring Tools and Code Actions (Quick Fix)
    14. Example: Common code actions
    15. Example: Organize imports
    16. 6. IntelliSense and Auto-completion in TypeScript
    17. Example: IntelliSense configuration
    18. Example: IntelliSense in action
    19. Development Tools and IDE Integration Summary

  18. TypeScript Error Handling and Debugging

    1. 1. TypeScript Compiler Error Messages (TS2304, TS2322, TS2345)
    2. Example: Common compiler errors and fixes
    3. Example: Understanding error messages
    4. 2. Type Error Diagnosis and Resolution Strategies
    5. Example: Diagnosis techniques
    6. Example: Debugging type inference
    7. 3. Source Maps (sourceMap: true) and Debugging
    8. Example: Source map configuration
    9. Example: VS Code debugging configuration
    10. 4. Runtime Error Handling with Type Safety (try/catch)
    11. Example: Result type pattern
    12. Example: Custom error classes and type guards
    13. 5. Type-only Imports (import type) for Debugging
    14. Example: Type-only imports
    15. Example: Debugging with type imports
    16. 6. Conditional Compilation and Environment Types (NODE_ENV)
    17. Example: Environment-specific types
    18. Example: Feature flags and conditional types
    19. Error Handling and Debugging Summary

  19. TypeScript Enterprise Patterns

    1. 1. Dependency Injection (InversifyJS) and IoC Container Typing
    2. Example: InversifyJS dependency injection
    3. Example: Manual DI pattern (no framework)
    4. 2. Plugin Architecture and Type-safe API Design
    5. Example: Type-safe plugin system
    6. 3. Schema Validation (Zod, Yup, Joi, io-ts) TypeScript Integration
    7. Example: Zod schema validation
    8. Example: Joi validation
    9. 4. ORM Type Safety (Prisma, TypeORM, Drizzle, Sequelize)
    10. Example: Prisma type-safe ORM
    11. Example: TypeORM entities
    12. 5. GraphQL Code Generation (GraphQL Codegen) and Type Safety
    13. Example: GraphQL Code Generator
    14. 6. Microservices Communication and API Contracts (tRPC, OpenAPI)
    15. Example: tRPC end-to-end type safety
    16. Example: OpenAPI type generation
    17. Advanced Patterns and Enterprise Features Summary

  20. JavaScript to TypeScript Migration

    1. 1. JavaScript to TypeScript Migration Step-by-Step
    2. Example: Incremental migration setup
    3. Example: Converting a JavaScript file
    4. 2. Gradual Type Adoption (@ts-check, JSDoc type comments)
    5. Example: Using @ts-check with JSDoc
    6. Example: Enabling checkJs project-wide
    7. 3. Legacy Code Integration and Incremental Migration
    8. Example: Creating type stubs for legacy code
    9. Example: Adapter pattern for legacy data
    10. 4. Third-party Library Types (@types/*, DefinitelyTyped)
    11. Example: Working with type definitions
    12. 5. Team Onboarding and TypeScript Training
    13. Example: Onboarding checklist
    14. Example: Team training resources
    15. 6. Code Review Guidelines for TypeScript Projects
    16. Example: Code review checklist
    17. Example: PR review feedback examples
    18. Migration and Adoption Strategies Summary