PronounsPage/server/no-ssr.ts

import type { Request, Response, NextFunction } from 'express';

import isHighLoadTime from './overload.js';

const USER_AGENT_BOTS = /bot|crawler|baiduspider|80legs|ia_archiver|voyager|curl|wget|yahoo! slurp|mediapartners-google|facebookexternalhit|twitterbot|whatsapp|php|python|mastodon/;
const USER_AGENT_BROWSERS = /mozilla|msie|gecko|firefox|edge|opera|safari|netscape|konqueror|android/;

const isBrowser = (userAgent: string | undefined): boolean => {
    if (!userAgent) {
        return false;
    }
    const isProbablyBot = !!userAgent.toLowerCase().match(USER_AGENT_BOTS);
    const isProbablyBrowser = !!userAgent.toLowerCase().match(USER_AGENT_BROWSERS);

    return isProbablyBrowser && !isProbablyBot;
};

export default function (req: Request, res: Response, next: NextFunction): void {
    if (process.env.NODE_ENV === 'production' && !req.url.startsWith('/card/@') && !req.url.startsWith('/blog.atom')) {
        res.spa = isBrowser(req.headers['user-agent']) || isHighLoadTime(global.config.locale);
    }
    next();
}