Add web front-end and fix API issues

node_modules/rxjs/dist/esm/internal/util/applyMixins.js

@@ -0,0 +1,11 @@
+export function applyMixins(derivedCtor, baseCtors) {
+    for (let i = 0, len = baseCtors.length; i < len; i++) {
+        const baseCtor = baseCtors[i];
+        const propertyKeys = Object.getOwnPropertyNames(baseCtor.prototype);
+        for (let j = 0, len2 = propertyKeys.length; j < len2; j++) {
+            const name = propertyKeys[j];
+            derivedCtor.prototype[name] = baseCtor.prototype[name];
+        }
+    }
+}
+//# sourceMappingURL=applyMixins.js.map