---
title: JavaScript SDK 0.2.0
summary: null
url: >-
  https://www.fastly.com/documentation/reference/changes/2021/08/javascript-sdk-0.2.0
---

## Added

- Implement the WHATWG URL and URLSearchParam classes
- Enable private class fields and methods, plus ergonomic brand checks
- Breaking change: Implement FetchEvent#waitUntil
- Mark builtins that rely on hostcalls as request-handler-only
- Add support for including binary files, and for using typed arrays as Response bodies
- Improve handling of hostcall errors

## Fixed

- Breaking change: Make FetchEvent handling more spec-compliant
- Normalize HTTP method names when constructing Requests
- Don't trap when trying to delete a non-existent header
- Properly support `base` argument in `URL` constructor