Type Alias Includes<Value, Item>

Includes: Value extends readonly [Value[0], ...(infer rest)]
? IsEqual<Value[0], Item> extends true ? true : Includes<rest, Item>
: false

Returns a boolean for whether the given array includes the given item.

This can be useful if another type wants to make a decision based on whether the array includes that item.

Type Parameters

Value extends readonly any[]
Item

Example

import type {Includes} from 'type-fest';

type hasRed<array extends any[]> = Includes<array, 'red'>;