inscriboor/extension/content.js

(() => {
  let port = null;

  const connect = () => {
    if (port) return port;
    port = chrome.runtime.connect({ name: "inscriboor-provider" });
    port.onMessage.addListener(message => {
      window.postMessage({ source: "inscriboor-extension", ...message }, "*");
    });
    port.onDisconnect.addListener(() => { port = null; });
    return port;
  };

  connect();

  window.addEventListener("message", event => {
    if (event.data?.source !== "inscriboor-page") return;
    connect().postMessage({
      id: event.data.id,
      method: event.data.method,
      params: event.data.params,
      origin: location.origin
    });
  });
})();