Recipes

function getText(message: { conversation?: string | null; extendedTextMessage?: { text?: string | null } | null } | null | undefined) {
  return message?.conversation ?? message?.extendedTextMessage?.text ?? undefined
}

client.on('message', async (event) => {
  if (event.key.fromMe) return // ignore our own sends (multi-device echo)
  const text = getText(event.message)?.trim()
  const to = event.key.remoteJid
  if (!text || !text.startsWith('/') || !to) return

  const [command, ...args] = text.slice(1).split(/\s+/)
  switch (command) {
    case 'ping':
      await client.message.send(to, 'pong')
      break
    case 'echo':
      await client.message.send(to, args.join(' ') || '(nothing to echo)')
      break
    default:
      await client.message.send(to, `Unknown command: ${command}`)
  }
})

client.on('message', async (event) => {
  if (event.key.fromMe) return
  const to = event.key.remoteJid
  const sender = event.key.participant ?? event.key.remoteJid

  await client.message.send(
    to,
    { type: 'text', text: 'got it 👍' },
    { quote: event, mentions: sender ? [sender] : [] }
  )
})

client.on('message', async (event) => {
  if (!event.message?.imageMessage) return
  const file = `./media/${Date.now()}.jpg`
  await client.message.downloadToFile(event, file)
  console.log('saved', file)
})

client.on('group', async (event) => {
  if (event.action !== 'add' || !event.groupJid || !event.participants?.length) return

  const jids = event.participants.map((p) => p.jid).filter((j): j is string => Boolean(j))
  const mentions = jids.map((j) => `@${j.split('@')[0]}`).join(' ')

  await client.message.send(
    event.groupJid,
    { type: 'text', text: `Welcome ${mentions}! 🎉` },
    { mentions: jids }
  )
})

await client.message.send(chatJid, {
  type: 'poll',
  name: 'Lunch?',
  options: ['Pizza', 'Sushi', 'Salad'],
  selectableCount: 1
})

client.on('message', async (event) => {
  if (event.key.fromMe) return
  // Pass the event verbatim — its key is read for you.
  await client.message.send(event.key.remoteJid, {
    type: 'reaction',
    emoji: '❤️',
    target: event
  })
})