Properties
Optional attachments
Optional blocks
Optional channel
channel: undefined | string
Optional icon_emoji
icon_emoji: undefined | string
Optional icon_url
icon_url: undefined | string
Optional link_names
link_names: undefined | false | true
Optional text
text: undefined | string
Optional unful_media
unful_media: undefined | false | true
Optional unfurl_links
unfurl_links: undefined | false | true
Optional username
username: undefined | string