TypeScript Cheat Sheet

Advanced types, interfaces, and TS-specific syntax.

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Basic Types Interfaces Generics
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Basic Types

Concept / Tag Code Snippet Description
Union Type 
let id: number | string;
 Allow multiple types.
Enum 
enum Role { Admin, User }
 Named constants.

Interfaces

Concept / Tag Code Snippet Description
Interface 
interface User {
  id: number;
  name: string;
}
 Define object shape.
Readonly 
readonly name: string;
 Cannot be modified.

Generics

Concept / Tag Code Snippet Description
Generic Fn 
function wrap<T>(item: T): T[] { ... }
 Reusable type logic.
Type Assertion 
const val = someVar as string;
 Explicit type casting.

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