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src/shared/message.ts

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+export type MessageAction =
+    | "GET_CRAWL_STATE"  // 获取爬虫的当前状态
+    | "START_CRAWL" // 开始爬取
+
+interface BackgroundMessage<T = any> {
+    action: MessageAction; // 标识要执行的操作
+    payload?: T;    // 附带的数据
+}
+
+interface BackgroundResponse<T = any> {
+    data: T | null
+}
+
+/**
+ * 定义发送给 Background Script 的消息类型
+ */
+export function sendBackgroundMessage<T>(data: BackgroundMessage): Promise<BackgroundResponse<T>> {
+    // 检查是否在 Chrome 扩展环境中运行
+    if (typeof chrome === 'undefined' || !chrome.runtime?.sendMessage) {
+        return Promise.resolve({data: null});
+    }
+
+    return chrome.runtime.sendMessage(data);
+}