Merge development (#86)

src/services/getTimerWorker.js

@@ -0,0 +1,40 @@
+import worker_script from "./timeoutScript";
+
+const getTimerWorker = () => {
+  const worker = new Worker(worker_script);
+  let messageHandler = null;
+  const workerHandler = (e) => {
+    if (messageHandler === null) return;
+    messageHandler(e);
+  }
+
+  worker.addEventListener("message", workerHandler);
+
+  return {
+    start: (duration) => {
+      if (!worker) return;
+      worker.postMessage({
+        action: "start",
+        duration,
+      });
+    },
+
+    stop: () => {
+      worker.postMessage({
+        action: "stop",
+      });
+    },
+
+    onMessage: (handler) => {
+      messageHandler = handler;
+    },
+
+    terminate: () => {
+      worker.removeEventListener("message", workerHandler);
+      worker.terminate();
+      messageHandler = null;
+    }
+  }
+}
+
+export default getTimerWorker;