Is it possible to access localstorage from Angular proxy.config.js file?

I am trying to use proxy to update the base url and also append the token from the local storage. I am able to update the URL but when I try to access the token it gives me error ReferenceError: window is not defined. Is it possible to access local storage from proxy. I tried localstorage.getItem('token') and also windows.localstorage.getItem('token').

My proxy.conf.js file looks like this

const PROXY_CONF = [
    {
        context: ['/testData/*'],
        target: 'https://test.com/',
        secure: false,
        changeOrigin: true,
        bypass: function (req, res, proxyOptions) {
            req.headers['authorization'] = typeof window !== 'undefined' ? window.localStorage.getItem(`token`) : '';
        },
    }
];
module.exports = PROXY_CONF;