init commit,

99_references/supabase-examples/edge-functions/supabase/functions/streams/index.ts

@@ -0,0 +1,24 @@
+const msg = new TextEncoder().encode('data: hello\r\n\r\n')
+
+Deno.serve((_) => {
+  let timerId: number | undefined
+
+  const body = new ReadableStream({
+    start(controller) {
+      timerId = setInterval(() => {
+        controller.enqueue(msg)
+      }, 1000)
+    },
+    cancel() {
+      if (typeof timerId === 'number') {
+        clearInterval(timerId)
+      }
+    },
+  })
+
+  return new Response(body, {
+    headers: {
+      'Content-Type': 'text/event-stream',
+    },
+  })
+})