MapHas

Since 1.3.0

Check if a key exists in a type-level map. Returns true if the key is present, otherwise false.

Signature

export type MapHas<M, K> = K extends keyof M ? true : false

Parameters

Parameter	Description
M	The type-level map to search in
K	The key to check for

Examples

Basic Usage

import type { MapHas } from 'uni-types'

type Config = { host: string; port: number }
type Result = MapHas<Config, 'host'>
// true

Key Not Found

type Result = MapHas<Config, 'protocol'>
// false