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TypeScript Island

JavaScript with armor!

Egg · 10 XP

Type Annotation

Egg · 10 XP

String Type

Egg · 10 XP

Boolean Type

Egg · 15 XP

Array Type

Egg · 15 XP

Tuple

Egg · 15 XP

Any

Egg · 20 XP

Unknown

Cub · 20 XP

Union

Cub · 20 XP

Literal Type

Cub · 25 XP

Interface

Cub · 25 XP

Type Alias

Cub · 25 XP

Optional Prop

Cub · 30 XP

Readonly

Cub · 30 XP

Function Type

Cub · 30 XP

Void

Beast · 35 XP

Never

Beast · 35 XP

Generic Fn

Beast · 35 XP

Generic Array

Beast · 40 XP

Enum

Beast · 40 XP

As Cast

Beast · 40 XP

Non-null !

Beast · 45 XP

Class

Beast · 45 XP

Public/Private

Legend · 45 XP

Utility Partial

Legend · 50 XP

Boss: Generic API

Legend · 50 XP

Pick<T,K>

Legend · 50 XP

Omit<T,K>

Legend · 55 XP

keyof

Legend · 55 XP

Type Guard

Legend · 55 XP

Discriminated Union

Beat a quest to unlock the next checkpoint.

Weekly bonus · AI-crafted

New quest brewing…