new_router.js

const util = require('util');
const snekfetch = require('snekfetch');

const paramable = ['channels', 'users', 'guilds', 'members'];
const reflectors = ['toString', 'valueOf', 'inspect', Symbol.toPrimitive, util.inspect.custom];


function apiRequest(method, url, options) {
  const request = snekfetch[method](url);
  if (options.reason) request.set('X-Audit-Log-Reason', options.reason);
  if (options.auth !== false) request.set('Authorization', 'token');
  if (options.files) {
    for (const file of options.files) request.attach(file.name, file.attachment, file.name);
    if (typeof options.data !== 'undefined') request.attach('payload_json', JSON.stringify(this.data));
  } else if (typeof options.data !== 'undefined') {
    request.send(options.data);
  }
  return request;
}

const handler = {
  get: (list, name) => {
    if (reflectors.includes(name)) return () => list.join('/');
    if (paramable.includes(name)) {
      function toReturn(id) { // eslint-disable-line no-inner-declarations
        list = list.concat(name);
        if (id) list = list.concat(id);
        return new Proxy(list, handler);
      }
      const directJoin = () => `${list.join('/')}/${name}`;
      for (const r of reflectors) toReturn[r] = directJoin;
      return toReturn;
    }
    if (name in snekfetch) return (options = {}) => apiRequest(name, list.join('/'), options);
    return new Proxy(list.concat(name), handler);
  },
};

const api = new Proxy(['https://discordapp.com/api/v7'], handler);

api.gateway.get()
  .then((r) => r.body)
  .catch((r) => r.body)
  .then(console.log);