chore: init frontend with knowledge module

packages/crud/src/utils/mitt.ts

@@ -0,0 +1,30 @@
+import _mitt from "mitt";
+
+const mitt = _mitt();
+
+class Mitt {
+	id: number;
+
+	constructor(id?: number) {
+		this.id = id || 0;
+	}
+
+	send(type: "emit" | "off" | "on", name: string, ...args: any[]) {
+		// @ts-expect-error
+		mitt[type](`${this.id}__${name}`, ...args);
+	}
+
+	emit(name: string, ...args: any[]) {
+		this.send("emit", name, ...args);
+	}
+
+	off(name: string, handler: (...args: any[]) => void) {
+		this.send("off", name, handler);
+	}
+
+	on(name: string, handler: (...args: any[]) => void) {
+		this.send("on", name, handler);
+	}
+}
+
+export { Mitt, mitt };