Add web front-end and fix API issues

node_modules/concurrently/dist/lib/flow-control/log-error.js

@@ -0,0 +1,17 @@
+/**
+ * Logs when commands failed executing, e.g. due to the executable not existing in the system.
+ */
+export class LogError {
+    logger;
+    constructor({ logger }) {
+        this.logger = logger;
+    }
+    handle(commands) {
+        commands.forEach((command) => command.error.subscribe((event) => {
+            this.logger.logCommandEvent(`Error occurred when executing command: ${command.command}`, command);
+            const errorText = String(event instanceof Error ? event.stack || event : event);
+            this.logger.logCommandEvent(errorText, command);
+        }));
+        return { commands };
+    }
+}