TypeScript type system fundamentals and basic typing patterns
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
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