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Basics

Introduction

TypeScript is a JavaScript superset adding static types for robust web development.

Installation

TypeScript installation uses npm to set up the compiler for development.

Running Code

TypeScript code runs via tsc compilation to JavaScript with ts-node for scripts.

Syntax

TypeScript syntax extends JavaScript with types using interfaces and enums.

Variables

TypeScript variables use let and const with type annotations.

Data Types

TypeScript data types include string number boolean and any with strict typing.

Type Annotations

TypeScript type annotations define variable types improving code safety.

Type Inference

TypeScript type inference automatically assigns types reducing boilerplate.

any Type

TypeScript any type allows flexible typing, but use sparingly to avoid errors.

unknown Type

TypeScript unknown type is safer than any requiring type checks.

void Type

TypeScript void type denotes functions with no return value common in callbacks.

never Type

TypeScript never type represents unreachable code used in exhaustive checks.

Operators

TypeScript operators include arithmetic and logical extending JavaScript.

If Else

TypeScript if-else statements control flow leveraging type guards.

Switch

TypeScript switch statements handle cases with type narrowing support.

Loops

TypeScript loops include for and while with type-safe iteration.

For...Of

TypeScript for...of iterates typed arrays ensuring type safety.

For...In

TypeScript for...in iterates object keys with typed properties.

Comments

TypeScript comments use // and /* */ supporting JSDoc for types.

Errors

TypeScript errors use try-catch with typed error handling.

Debugging

TypeScript debugging uses source maps and VS Code breakpoints.

Strict Mode

TypeScript strict mode enforces type safety, enabling strictNullChecks.

Best Practices

TypeScript best practices include avoiding any, using interfaces.

tsconfig

TypeScript tsconfig.json sets compiler options like target and module.

Security Basics

TypeScript security practices ensure safe DOM manipulation avoiding XSS.

Union Types

TypeScript union types allow multiple types with | operator.

Intersection Types

TypeScript intersection types combine types with & for complex objects.

Type Aliases

TypeScript type aliases simplify complex types improving readability.

Generics

TypeScript generics create reusable typed components, like typed arrays.

Type Guards

TypeScript type guards narrow types with typeof and instanceof.

Narrowing

TypeScript narrowing refines types using conditions enhancing safety.

Discriminated Unions

TypeScript discriminated unions use literal types for safe switching.

Literal Types

TypeScript literal types restrict values to specific literals like "success".

Conditional Types

TypeScript conditional types infer types based on conditions using extends.

Mapped Types

TypeScript mapped types transform object properties like Readonly.

Utility Types

TypeScript utility types, like Partial and Pick, simplify type manipulation.

Type Assertions

TypeScript type assertions cast types with as avoiding unsafe casts.

Non-Nullable Types

TypeScript non-nullable types enforce strictNullChecks reducing null errors.

keyof Operator

TypeScript keyof operator extracts property names as literal types.

infer Keyword

TypeScript infer keyword extracts types in conditional types for advanced logic.

Indexed Types

TypeScript indexed types access object properties with dynamic keys.

Tuple Types

TypeScript tuple types define fixed-length arrays with specific types.

Type Predicates

TypeScript type predicates narrow types with custom boolean checks.

Objects

TypeScript objects use interfaces or types with optional properties.

Interfaces

TypeScript interfaces define object shapes supporting optional fields.

Classes

TypeScript classes add typed properties and methods with access modifiers.

Inheritance

TypeScript inheritance extends classes with override for methods.

Abstract Classes

TypeScript abstract classes define blueprints requiring implementation.

Enums

TypeScript enums define named constants with numeric and string variants.

Class Generics

TypeScript class generics create typed classes like generic containers.

Interface Extension

TypeScript interface extension combines interfaces for reusable types.

Class Implements

TypeScript class implements ensures classes adhere to interface contracts.

Readonly Properties

TypeScript readonly properties prevent mutation ensuring immutability.

Functions

TypeScript functions use typed parameters and return types with overloads.

Function Types

TypeScript function types define signatures ensuring type safety.

Arrow Functions

TypeScript arrow functions preserve this with typed parameters.

Overloads

TypeScript function overloads define multiple signatures for flexibility.

Default Parameters

TypeScript default parameters provide fallback values with type inference.

Rest Parameters

TypeScript rest parameters collect arguments typed as arrays.

Optional Parameters

TypeScript optional parameters use ? allowing undefined values.

Call Signatures

TypeScript call signatures define function types used in interfaces.

Function Generics

TypeScript function generics create reusable typed functions like map.

Decorators

TypeScript decorators add metadata used in Angular and experimental APIs.

Modules

TypeScript modules use import/export with ES modules preferred.

Namespaces

TypeScript namespaces organize code though modules are recommended.

Module Resolution

TypeScript module resolution supports node and classic strategies.

Declaration Files

TypeScript declaration files (.d.ts) provide types for JavaScript libraries.

Import Types

TypeScript import types isolate type imports improving compilation.

Export Types

TypeScript export types share interfaces across modules with export as.

Ambient Modules

TypeScript ambient modules declare types for external JavaScript code.

Module Augmentation

TypeScript module augmentation extends third-party module types.

Dynamic Imports

TypeScript dynamic imports load modules asynchronously with type safety.

Path Aliases

TypeScript path aliases simplify imports using tsconfig paths.

Async Functions

TypeScript async functions use await with Promise types for async code.

Promises

TypeScript Promises use generic types ensuring typed resolutions.

Fetch API

TypeScript Fetch API types responses with error handling for HTTP.

Async Patterns

TypeScript async patterns manage parallel or sequential Promise execution.

Async Error Handling

TypeScript async error handling uses typed errors with try-catch.

DOM Types

TypeScript DOM types ensure safe manipulation using HTMLElement types.

React Components

TypeScript React components use FC and Props interfaces for type safety.

Angular Components

TypeScript Angular components use decorators with typed services.

Vue Components

TypeScript Vue components use defineComponent for typed props.

Node.js

TypeScript Node.js uses @types/node for typed server-side development.

Express

TypeScript Express types routes and middleware enhancing API safety.

Next.js

TypeScript Next.js types pages and APIs for full-stack applications.

Event Handling

TypeScript event handling uses Event types ensuring safe listeners.

Form Validation

TypeScript form validation uses typed FormData for safe input checks.

Web APIs

TypeScript Web APIs type Geolocation and Fetch for browser integration.

JSON Handling

TypeScript JSON handling uses interfaces for safe parsing and serialization.

Error Handling

TypeScript error handling uses typed errors and custom exceptions.

Type-Safe APIs

TypeScript type-safe APIs use interfaces for request/response validation.

Factory Functions

TypeScript factory functions create typed objects with generic support.

Mixins

TypeScript mixins combine classes with type-safe implementation.

Type-Safe Config

TypeScript type-safe configuration uses const assertions for settings.

Type-Safe Routing

TypeScript type-safe routing types routes for frameworks like Express.

Type-Safe State

TypeScript type-safe state uses interfaces for Redux or Zustand.

Dependency Injection

TypeScript dependency injection types services for modular code.

React App

TypeScript React app uses typed components and hooks for a UI.

Node.js API

TypeScript Node.js API uses Express with typed routes and middleware.

Vue App

TypeScript Vue app uses typed components for a reactive UI.

Angular App

TypeScript Angular app uses typed services for a dynamic UI.

Next.js App

TypeScript Next.js app types pages and APIs for a full-stack site.

Form Validation

TypeScript form validation types inputs and errors for a web form.

Dynamic List

TypeScript dynamic list types DOM elements for a typed UI component.

API Fetch

TypeScript API fetch types responses for safe data retrieval.

Error Boundary

TypeScript error boundary catches React errors with typed props.

Generic Component

TypeScript generic component types props for reusable UI elements.

Typed Config

TypeScript typed configuration uses interfaces for safe app settings.

Module Extension

TypeScript module extension adds types to a JavaScript library.

GraphQL Integration

TypeScript GraphQL integration types queries with Apollo or urql.

Welcome to TypeScript Tricks - Your Gateway to Mastering TypeScript!

Basics

Type System

Objects and Classes

Functions

Modules

Async

Web Development

Patterns

Examples