Polyfill for the missing browser.window API in the Firefox for Android

firefox_for_android.polyfill.ts

if (!browser.windows) browser.windows = {};
if (!browser.windows.getCurrent) {
  browser.windows.getCurrent = async (getInfo?: browser.windows.GetInfo): Promise<browser.windows.Window> => {
    const tabs = await browser.tabs.query({});
    const activeTab = tabs.find(tab => tab.active);
    return {
      id: activeTab?.windowId ?? 1,
      title: activeTab?.title ?? '',
      focused: true,
      alwaysOnTop: false,
      incognito: !!browser.extension.inIncognitoContext,
      ...(getInfo?.populate ? {tabs: tabs} : {}),
      state: 'maximized',
      type: 'normal',
      height: screen.availHeight,
      width: screen.availWidth,
      top: 0,
      left: 0,
    };
  };
}
if (!browser.windows.getLastFocused) {
  browser.windows.getLastFocused = async (getInfo?: browser.windows.GetInfo): Promise<browser.windows.Window> => browser.windows.getCurrent(getInfo);
}
if (!browser.windows.get) {
  browser.windows.get = async (windowId: number, getInfo?: browser.windows.GetInfo): Promise<browser.windows.Window> => {
    const [tab] = await browser.tabs.query({windowId: windowId});
    return {
      ...(await browser.windows.getCurrent(getInfo)),
      id: tab?.windowId ?? 1,
      title: tab?.title ?? '',
      focused: tab?.active,
    };
  };
}
if (!browser.windows.getAll) {
  browser.windows.getAll = async (getInfo?: browser.windows._GetAllGetInfo): Promise<browser.windows.Window[]> => {
    return getInfo?.windowTypes?.includes('normal') !== false ? [await browser.windows.getCurrent(getInfo)] : [];
  }
}
if (!browser.windows.update) {    // we can emulate some window operations using tabs API (since each Tab is in own window)
  browser.windows.update = async (windowId: number, updateInfo: browser.windows._UpdateUpdateInfo): Promise<browser.windows.Window> => {
    if (updateInfo.focused || updateInfo.state === 'maximized') {
      const [tab] = await browser.tabs.query({windowId: windowId});
      if (tab) await browser.tabs.update(tab.id!, {active: true});
    }
    return browser.windows.getCurrent();
  };
}
if (!browser.windows.remove) {
  browser.windows.remove = async (windowId: number): Promise<void> => {
    const [tab] = await browser.tabs.query({windowId: windowId});
    if (tab) await browser.tabs.remove(tab.id!);
  };
}
if (!browser.windows.create) {
  browser.windows.create = async (createData?: browser.windows._CreateCreateData): Promise<browser.windows.Window> => {
    const links = !createData?.url ? ['about:blank'] : Array.isArray(createData.url) ? createData.url : [createData.url];
    for (const url of links) {
      await browser.tabs.create({url: url, active: createData?.focused});
    }
    const win = await browser.windows.getCurrent({populate: true});
    win.tabs = win.tabs!.filter(tab => tab.windowId === win.id);    // make sure the "tabs" property contains ONLY tabs from this window (which is always only one in Android)
    return win;
  };
}