✨ Add Meta Pixel block

Closes #582

packages/embeds/js/src/lib/pixel.ts

@@ -0,0 +1,41 @@
+import { PixelBlock } from '@typebot.io/schemas'
+
+declare const fbq: (
+  arg0: string,
+  arg1: string,
+  arg2: Record<string, string> | undefined
+) => void
+
+export const initPixel = (pixelId: string) => {
+  const script = document.createElement('script')
+  script.innerHTML = `!function(f,b,e,v,n,t,s)
+  {if(f.fbq)return;n=f.fbq=function(){n.callMethod?
+  n.callMethod.apply(n,arguments):n.queue.push(arguments)};
+  if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';
+  n.queue=[];t=b.createElement(e);t.async=!0;
+  t.src=v;s=b.getElementsByTagName(e)[0];
+  s.parentNode.insertBefore(t,s)}(window, document,'script',
+  'https://connect.facebook.net/en_US/fbevents.js');
+  fbq('init', '${pixelId}');
+  fbq('track', 'PageView');`
+  document.head.appendChild(script)
+
+  const noscript = document.createElement('noscript')
+  noscript.innerHTML = `<img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=${pixelId}&ev=PageView&noscript=1"/>`
+  document.head.appendChild(noscript)
+}
+
+export const trackPixelEvent = (options: PixelBlock['options']) => {
+  if (!options.eventType) return
+  const params = options.params?.length
+    ? options.params.reduce<Record<string, string>>((obj, param) => {
+        if (!param.key || !param.value) return obj
+        return { ...obj, [param.key]: param.value }
+      }, {})
+    : undefined
+  if (options.eventType === 'Custom') {
+    if (!options.name) return
+    fbq('trackCustom', options.name, params)
+  }
+  fbq('track', options.eventType, params)
+}