Add web front-end and fix API issues

node_modules/rxjs/dist/cjs/internal/util/Immediate.js

@@ -0,0 +1,33 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.TestTools = exports.Immediate = void 0;
+var nextHandle = 1;
+var resolved;
+var activeHandles = {};
+function findAndClearHandle(handle) {
+    if (handle in activeHandles) {
+        delete activeHandles[handle];
+        return true;
+    }
+    return false;
+}
+exports.Immediate = {
+    setImmediate: function (cb) {
+        var handle = nextHandle++;
+        activeHandles[handle] = true;
+        if (!resolved) {
+            resolved = Promise.resolve();
+        }
+        resolved.then(function () { return findAndClearHandle(handle) && cb(); });
+        return handle;
+    },
+    clearImmediate: function (handle) {
+        findAndClearHandle(handle);
+    },
+};
+exports.TestTools = {
+    pending: function () {
+        return Object.keys(activeHandles).length;
+    }
+};
+//# sourceMappingURL=Immediate.js.map