Function constant

Decoder that only accepts a specific constant value.

Example

const trueDecoder = JsonDecoder.constant(true);

trueDecoder.decode(true); // Ok<boolean>({value: true})
trueDecoder.decode(false); // Err({error: 'false is not exactly true'})

constant<T>(value: T): Decoder<T>
Type Parameters
- T
Parameters
- value: T
  The constant value to accept
Returns Decoder<T>
A decoder that only accepts the specified value