IFTTT filter to convert Sonarr webhooks into Slack messages

filter.js

let payload = JSON.parse(MakerWebhooks.jsonEvent.JsonPayload);
Slack.postToChannel.setTitle(payload.series.title);
if(payload.series.tvdbId) Slack.postToChannel.setTitleUrl(`https://www.thetvdb.com/?tab=series&id=${payload.series.tvdbId}`);
let message = (payload.episodes.length == 1 ? `New episode of ${payload.series.title}:\n` : `New episodes of ${payload.series.title}:\n`) + payload.episodes.map((episode:any)=>`* S${episode.seasonNumber}E${episode.episodeNumber} ${episode.title}`).join("\n");
Slack.postToChannel.setMessage(message);