Add web front-end and fix API issues

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

@@ -0,0 +1,15 @@
+/**
+ * Logs the exit code/signal of commands.
+ */
+export class LogExit {
+    logger;
+    constructor({ logger }) {
+        this.logger = logger;
+    }
+    handle(commands) {
+        commands.forEach((command) => command.close.subscribe(({ exitCode }) => {
+            this.logger.logCommandEvent(`${command.command} exited with code ${exitCode}`, command);
+        }));
+        return { commands };
+    }
+}