Function nullable

Checks if the assertion passes or if the value is null.

Example

const maybeString = nullable(string);

maybeString(1); // Error: type
maybeString("hello"); // passes
maybeString(null); // passes

nullable<$Value>(assertion): Assertion<Nullable<$Value>>
Type Parameters
- $Value
Parameters
- assertion: Assertion<$Value>
  Assertion to be checked.
Returns Assertion<Nullable<$Value>>
- Defined in src/assertions/nullable/index.ts:18