var ua = require('@searchfe/user-agent')
if (ua.isIOS()) {
    var version = ua.iOSVersion()
    console.log('main version': version[0])
    console.log('sub  version': version[1])
}

import path from 'path';

export default {
    //...
    plugins: [{
        resolveId(id) {
            if (id.startsWith('@searchfe/user-agent')) {
                return path.resolve(`${yourPath}/@searchfe/user-agent/index.umd.js`);
            }
            return null;
        }
    }],
    //...
}

module.exports = {
    //...
    resolve: {
        alias: {
            "@searchfe/user-agent": "@searchfe/user-agent/index.umd.js"
        }
    }
};