SystemJS Version 6.9.0

Features

• Onerror Callback Support for Errors Fetching External Import Map (#2324 @kykwak)
• Fix the relative path problem of CSS url() in CSSStyleSheet() (#2326 @liufei)

Patches

• Fix named-register.js - omit name from register call. Resolves #2293. (#2329 @joeldenning)

Docs

• Fixed importmap example code (#2309 @maurer2)