Add web front-end and fix API issues

node_modules/rxjs/dist/esm5/internal/util/errorContext.js

@@ -0,0 +1,28 @@
+import { config } from '../config';
+var context = null;
+export function errorContext(cb) {
+    if (config.useDeprecatedSynchronousErrorHandling) {
+        var isRoot = !context;
+        if (isRoot) {
+            context = { errorThrown: false, error: null };
+        }
+        cb();
+        if (isRoot) {
+            var _a = context, errorThrown = _a.errorThrown, error = _a.error;
+            context = null;
+            if (errorThrown) {
+                throw error;
+            }
+        }
+    }
+    else {
+        cb();
+    }
+}
+export function captureError(err) {
+    if (config.useDeprecatedSynchronousErrorHandling && context) {
+        context.errorThrown = true;
+        context.error = err;
+    }
+}
+//# sourceMappingURL=errorContext.js.map