Function nullable

nullable<O, I>(decoder: Decoder<null | O, I>): ((value: I) => Failure<string> | Ok<null | O>)
Creates a nullable decoder from a given decoder. Allows input values to be null.

Example
```
// Creates a decoder that accepts values of type number or null.
const decoder = D.nullable(D.string)
```
Type Parameters
- O
- I = unknown
Parameters
- decoder: Decoder<null | O, I>
Returns ((value: I) => Failure<string> | Ok<null | O>)
- - (value: I): Failure<string> | Ok<null | O>
  - Parameters
    - value: I
    Returns Failure<string> | Ok<null | O>
- Defined in decoders.ts:125

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