made basic message passing setup

core/connection/workerThread.ts

@@ -0,0 +1,25 @@
+import { MessageType } from "./mainThread";
+
+const handleConnection = (msg: MessageEvent<any>) => {
+  const { data } = msg;
+
+  if (!(data instanceof Array)) return;
+  if (!data.length) return;
+
+  switch (data[0]) {
+    case MessageType.attachCanvas:
+      const canvas = data[1];
+      const ctxWorker = canvas.getContext("2d");
+
+      ctxWorker.clearRect(0, 0, canvas.width, canvas.height);
+      ctxWorker.font = "24px Verdana";
+      ctxWorker.textAlign = "center";
+      ctxWorker.fillText("Hello World", canvas.width / 2, canvas.height / 2);
+
+      break;
+  }
+
+  console.log(...data);
+}
+
+export { handleConnection };