client, server: remove workarounds for legacy browsers

client/config/polyfills.js

@@ -1,11 +0,0 @@
-if (typeof Promise === 'undefined') {
-  // Rejection tracking prevents a common issue where React gets into an
-  // inconsistent state due to an error, but it gets swallowed by a Promise,
-  // and the user has no idea what causes React's erratic future behavior.
-  require('promise/lib/rejection-tracking').enable();
-  window.Promise = require('promise/lib/es6-extensions.js');
-}
-
-// Object.assign() is commonly used with React.
-// It will use the native implementation if it's present and isn't buggy.
-Object.assign = require('object-assign');

package.json

@@ -140,7 +140,6 @@
     "nedb": "^1.8.0",
     "node-sass": "^4.13.0",
     "nodemon": "^2.0.5",
-    "object-assign": "4.1.1",
     "optimize-css-assets-webpack-plugin": "^5.0.4",
     "pascal-case": "^3.1.1",
     "passport": "^0.4.1",

server/models/ServerEvent.ts

@@ -7,10 +7,6 @@ class ServerEvent {
 
   constructor(res: Response) {
     this.res = res;
-
-    // Add 2kb padding for IE.
-    const padding = new Array(2049);
-    res.write(`:${padding.join(' ')}\n`);
   }
 
   emit<T extends keyof ServerEvents>(id: number, eventType: T, data: ServerEvents[T]) {