How do you create a decoder with an fp-ts Option field?

[fillon]

Hi,

How do you create a decoder with an Option type?

import * as D from 'io-ts/lib/Decoder'
import * as O from 'fp-ts/lib/Option'

const Response = D.array(D.struct({
    ip: D.string,
    countryName: O.Option<string> <-- ??
}))

[DenisFrezzato]

See option or optionFromNullable from io-ts-types. The experimental modules are not supported in io-ts-types yet, but you can replicate the same behaviours. There is also an open PR you can copy from.

[fillon]

Doesn't seem to work with the new Decoder