Function undefined

undefined(): Decoder<undefined>

Decoder for undefined values.

Returns Decoder<undefined>

A decoder that only accepts undefined values

Example

const undefinedDecoder = JsonDecoder.undefined();
undefinedDecoder.decode(undefined); // Ok<undefined>({value: undefined})
undefinedDecoder.decode(123); // Err({error: '123 is not a valid undefined'})
undefinedDecoder.decode(null); // Err({error: 'null is not a valid undefined'})