@tonconnect/isomorphic-fetch/index.js

This package provides `fetch` applicable in different environments (browser & NodeJS).

"use strict";

var realFetch = require('node-fetch');
module.exports = function(url, options) {
    if (/^\/\//.test(url)) {
        url = 'https:' + url;
    }
    return realFetch.call(this, url, options);
};

if (!global.fetch) {
    global.fetch = module.exports;
    global.Response = realFetch.Response;
    global.Headers = realFetch.Headers;
    global.Request = realFetch.Request;
}