FPasync.js

// Separate url validation logic from Replies.sayInvalidLinkedInUrl side effect.
// This way you can reuse this function in other methods
const getUrlFromEvent = (event) => Maybe.of(event)
    .filter(x => event.message.nlp.entities.url)
    .filter(x => event.message.nlp.entities.url[0].domain !== 'linkedin.com')
    .chain(x => Maybe.fromNullable(extract(event.message.nlp.entities.url)))

consume.onUserState('preferences/linkedin/url', ({ event, userId }) => getUrlFromEvent(event)
    .caseOf({
        Just: (url) => Promise.all([User.updatePreferences(userId, {linkedIn: url[0]}), Dispatch.linkedInUrlReceived({ userId })]),
        Nothing: () => Replies.sayInvalidLinkedInUrl({ userId })
    })