TypeScript Fundamentals Skill

Overview

Master TypeScript's type system fundamentals including basic types, interfaces, and type annotations.

Topics Covered

Basic Types

• Primitive types (string, number, boolean)
• Arrays and tuples
• Enums
• Any, unknown, never, void
• Null and undefined handling

Type Annotations

• Variable annotations
• Function parameters and returns
• Object type annotations
• Type inference
• Type assertions

Interfaces

• Interface declaration
• Optional properties
• Readonly properties
• Index signatures
• Interface extension

Type Aliases

• Type alias syntax
• Union types
• Intersection types
• Literal types
• Type narrowing

Functions

• Function type expressions
• Call signatures
• Overloads
• Generic functions
• Rest parameters

Prerequisites

• JavaScript fundamentals
• ES6+ features

Learning Outcomes

• Write type-safe code
• Use interfaces effectively
• Apply type narrowing
• Understand type inference