Type Alias IsNull<T>

IsNull: [T] extends [null] ? true : false

Returns a boolean for whether the given type is null.

Type Parameters

T

Example

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

type NonNullFallback<T, Fallback> = IsNull<T> extends true ? Fallback : T;

type Example1 = NonNullFallback<null, string>;
//=> string

type Example2 = NonNullFallback<number, string>;
//=? number