扩展的跨上下文消息通信

type Message =
  | { type: "settings:get" }
  | { type: "settings:set"; payload: { theme: "light" | "dark" } };

chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
  if (
    !message ||
    typeof message !== "object" ||
    typeof message.type !== "string"
  ) {
    sendResponse({ ok: false, error: "invalid_message" });
    return;
  }

  if (message.type === "settings:get") {
    sendResponse({ ok: true, data: { theme: "dark" } });
    return;
  }

  if (message.type === "settings:set") {
    sendResponse({ ok: true });
    return;
  }

  sendResponse({ ok: false, error: "unknown_message" });
});