---
title: "Extract | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Type Alias Extract<T, U>

Extract: [T](#t) extends [U](#u) ? [T](#t) : never

Extract from T those types that are assignable to U

#### Type Parameters

-   T
-   U