Type Alias IsUnknown<T>

IsUnknown: unknown extends T ? IsNull<T> extends false ? true : false : false

Returns a boolean for whether the given type is unknown.

Type Parameters

T

Link

https://github.com/dsherret/conditional-type-checks/pull/16

Useful in type utilities, such as when dealing with unknown data from API calls.

Example

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

type A = IsUnknown<unknown>;
//=> true

type B = IsUnknown<any>;
//=> false

type C = IsUnknown<never>;
//=> false

type D = IsUnknown<unknown[]>;
//=> false

type E = IsUnknown<object>;
//=> false

type F = IsUnknown<string>;
//=> false