refactor activity tab

src/workers/activityWorkerRunner.js

@@ -0,0 +1,34 @@
+import ActivityWorker from './activityWorker.js?worker&inline';
+
+let worker = null;
+let workerSeq = 0;
+const pendingWorkerCallbacks = new Map();
+
+function getWorker() {
+    if (!worker) {
+        worker = new ActivityWorker();
+        worker.onmessage = (event) => {
+            const { type, seq, payload } = event.data;
+            const callback = pendingWorkerCallbacks.get(seq);
+            if (!callback) {
+                return;
+            }
+            pendingWorkerCallbacks.delete(seq);
+            if (type === 'error') {
+                callback.reject(new Error(payload.message));
+                return;
+            }
+            callback.resolve(payload);
+        };
+    }
+    return worker;
+}
+
+export function runActivityWorkerTask(type, payload) {
+    return new Promise((resolve, reject) => {
+        const seq = ++workerSeq;
+        pendingWorkerCallbacks.set(seq, { resolve, reject });
+        getWorker().postMessage({ type, seq, payload });
+    });
+}
+