Add web front-end and fix API issues

node_modules/concurrently/dist/lib/flow-control/kill-on-signal.d.ts

@@ -0,0 +1,19 @@
+import EventEmitter from 'node:events';
+import { Command } from '../command.js';
+import { FlowController } from './flow-controller.js';
+/**
+ * Watches the main concurrently process for signals and sends the same signal down to each spawned
+ * command.
+ */
+export declare class KillOnSignal implements FlowController {
+    private readonly process;
+    private readonly abortController?;
+    constructor({ process, abortController, }: {
+        process: EventEmitter;
+        abortController?: AbortController;
+    });
+    handle(commands: Command[]): {
+        commands: Command[];
+        onFinish: () => void;
+    };
+}