HasProperty

Since v1.3.0

Check if an object type has a specific property. Returns true if the property key exists on the object type, otherwise returns false.

Signature

export type HasProperty<T, K> = K extends keyof T ? true : false

Parameters

Parameter	Description
T	The object type to check
K	The property key to look for

Examples

Basic Usage

import type { HasProperty } from 'uni-types'

type User = { name: string; age: number }
type HasName = HasProperty<User, 'name'> // true
type HasEmail = HasProperty<User, 'email'> // false

With Symbol Keys

import type { HasProperty } from 'uni-types'

const sym = Symbol('id')
type Obj = { [sym]: number; name: string }
type HasSym = HasProperty<Obj, typeof sym> // true
type HasAge = HasProperty<Obj, 'age'> // false