background.ts

chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
  if (request.myBookMark) {
    chrome.bookmarks.create(
      {
        parentId: '1',
        title: 'BookMark!',
        url: 'https://google.es/'
      },
      () => sendResponse('I have added my first bookmark!') // This is the response back for the emitter of the message in contentScript.ts
    );
  }
});