Replace Rollbar UMD with regular import

packages/website/package.json

@@ -58,6 +58,7 @@
         "react-typist": "^2.0.4",
         "redux": "^3.6.0",
         "redux-devtools-extension": "^2.13.2",
+        "rollbar": "^2.4.7",
         "semver-sort": "0.0.4",
         "styled-components": "^3.3.0",
         "thenby": "^1.2.3",

packages/website/ts/utils/error_reporter.ts

@@ -1,4 +1,5 @@
 import { logUtils } from '@0xproject/utils';
+import Rollbar = require('rollbar');
 import { configs } from 'ts/utils/configs';
 import { constants } from 'ts/utils/constants';
 import { utils } from 'ts/utils/utils';
@@ -36,8 +37,8 @@ const rollbarConfig = {
         'SecurityError (DOM Exception 18)',
     ],
 };
-import Rollbar = require('../../public/js/rollbar.umd.min.js');
-const rollbar = Rollbar.init(rollbarConfig);
+
+const rollbar = new Rollbar(rollbarConfig);
 
 export const errorReporter = {
     report(err: Error): void {