open url in chrome on macOS and reuse already open tab if possible.

macOSOpenURLInChrome.js

#!/usr/bin/env osascript -l JavaScript
const Chrome = Application('Chrome');

// although there is ES6 support , but "run" function
// can't use fat arrow functions.
// https://github.com/JXA-Cookbook/JXA-Cookbook/wiki/ES6-Features-in-JXA#arrow-functions
function run(args) {
  const url = args[0];
  const tabData = findTabForUrl(url);

  if (tabData) {
    // set the specified window to be the active window
    Chrome.windows[tabData.windowKey].activeTabIndex = tabData.tabKey + 1;

    // reload the tab
    tabData.tab.reload();

    // set the specified tab to be active
    Chrome.windows[tabData.windowKey].index = 1;
  } else {
    // create tab
    const tab = Chrome.Tab({url});

    // add tab to front window, making it the active tab
    Chrome.windows[0].tabs.push(tab);
  }
  // bring the window to front
  Chrome.activate();
}

function findTabForUrl(url) {
  const urlPattern = new RegExp(`^${url}.*`);

  // Chrome.windows is array like and can be looped
  for (let i = 0; i < Chrome.windows.length; i++) {
    const currentWindow = Chrome.windows[i];
    // same as chrome.windows, currentWindow.tabs is array like and can be looped.
    for (let j = 0; j < currentWindow.tabs.length; j++) {
      const currentTab = currentWindow.tabs[j];

      if (urlPattern.test(currentTab.url())) {
        return {
          windowKey: i,
          tabKey: j,
          tab: currentTab
        };
      }
    }
  }
}