prettier (via formatter.ts:format) is not working in browser usage demo

I was trying to make sure the error handling changes (throwing Error()) did not break the browser (it does not AFAICT) - but in the process I noticed that prettier is causing some issues with browser demo:

This problem can be reproduced with following changes to json-schema-to-typescript-browser

diff --git a/package.json b/package.json
index 34728cb..0c0366a 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
   },
   "homepage": "https://github.com/bcherny/json-schema-to-typescript-browser#readme",
   "dependencies": {
-    "json-schema-to-typescript": "^5.0.0",
+    "json-schema-to-typescript": "^5.7.0",
     "node-static": "^0.7.10"
   },
   "devDependencies": {

After running npm start and opening the page in the browser the following error can be seen in the browser console (Google Chrome - Version 69.0.3497.92)

Navigated to http://127.0.0.1:8080/
13:22:56.595 index.js:16 TypeError: existsSync is not a function
    at testDir (bundle.js:105336)
    at Object.exports.sync [as findParentDir] (bundle.js:105340)
    at loadPlugins (bundle.js:61269)
    at bundle.js:67780
    at Object.format (bundle.js:67801)
    at format (bundle.js:113783)
    at Object.<anonymous> (bundle.js:114118)
    at step (bundle.js:114055)
    at Object.next (bundle.js:114036)
    at fulfilled (bundle.js:114027)

The output is also not rendered:

With the following change to bcherny/json-schema-to-typescript the problem goes away:

diff --git a/src/index.ts b/src/index.ts
index 9041e40..be15085 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,7 +3,7 @@ import { JSONSchema4 } from 'json-schema'
 import { endsWith, merge } from 'lodash'
 import { dirname } from 'path'
 import { Options as PrettierOptions } from 'prettier'
-import { format } from './formatter'
+//import { format } from './formatter'
 import { generate } from './generator'
 import { normalize } from './normalizer'
 import { optimize } from './optimizer'
@@ -106,12 +106,12 @@ export async function compile(
     _options.cwd += '/'
   }
 
-  return format(generate(
+  return generate(
     optimize(
       parse(await dereference(normalize(schema, name), _options), _options)
     ),
     _options
-  ), _options)
+  )
 }
 
 export class ValidationError extends Error { }

This is screenshot with changes: