function checkDeviceWidth() {
    let windowWidth, pixelRatio, platform;
    {
        const { windowWidth: w, pixelRatio: p, platform: pf } = getBaseSystemInfo();
        windowWidth = w;
        pixelRatio = p;
        platform = pf;
    }
    deviceWidth = windowWidth;
    deviceDPR = pixelRatio;
    isIOS = platform === 'ios';
}
ungzip(data[, options]) -> Uint8Array|Array|String
- data (Uint8Array|Array|String): input data to decompress.
- options (Object): zlib inflate options.

Just shortcut to [[inflate]], because it autodetects format
by header.content. Done for convenience.