Function routeForTab

extension/background.js:317–323

(readHandler, writeHandler)

(function() {
  const routeForTab = (readHandler, writeHandler) => makeRouteWithContents(async ({tabId}) => {
    const tab = await browser.tabs.get(tabId);
    return readHandler(tab);

  }, writeHandler ? async ({tabId}, buf) => {
    await browser.tabs.update(tabId, writeHandler(buf));
  } : undefined);

  const routeFromScript = code => makeRouteWithContents(async ({tabId}) => {
    return (await browser.tabs.executeScript(tabId, {code}))[0];