npm / @qwik.dev/partytown

@qwik.dev/partytown

What changed in @qwik.dev/partytown 0.15 to 1, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-19.

1 breaking1 new APIs and options4 behavior and defaults11 fixes and other

See which of these apply to your code, ranked, in your agent:

npx @unstale/cli init

@qwik.dev/partytown 13 changes

Element interface introspection skips HTMLFencedFrameElement to avoid a Lighthouse deprecated API warning and prevent <fencedframe> creation in the sandbox.
1.0.1release notes
The main thread fallback keeps objects whose properties are forwarded with preserveBehavior, so data pushed before the fallback is not lost.
1.0.1release notes

Worker nodes expose only members shared by every Node; elements no longer inherit Text-only members such as splitText.
0.15.0release notes

Properties set on DOM elements by worker scripts are also set on the real elements, with functions calling back into the worker.
0.15.0release notes

CSS is defined in the worker; CSS.escape runs there and other members are forwarded to the main thread.
0.15.0release notes
Worker message listeners can reply through MessagePorts sent with the message.
0.15.0release notes
Worker scripts can message cross-origin iframes loaded by the browser, and replies reach the page's message listeners instead of stopping at the Partytown sandbox.
0.15.0release notes

For messages from page iframes, event.source is the iframe's window, allowing replies to reach it.
0.15.0release notes
Passing a Request object preserves its method, headers, body, and credentials instead of sending a GET to its URL.
0.15.0release notes
The href property of link and base elements is read and set on the main thread, allowing worker-added stylesheets to load.
0.15.0release notes
Scripts loaded on the main thread now fire worker-registered load and error handlers, including handlers registered with addEventListener.
0.15.0release notes
Calls on an iframe's window from the worker go through its iframe element, including for about:blank frames without a Partytown window on the main thread.
0.15.0release notes
Partytown scripts are not read until the window environment has been sent to the worker, preventing scripts added during page load from failing without being run again.
0.15.0release notes
Tabs starting Partytown in the same millisecond get different tab IDs, preventing a service worker from routing one tab's requests to another.
0.15.0release notes
Window properties whose classes Partytown does not emulate, such as caches and scheduler, return the worker's own object instead of throwing.
0.15.0release notes
Code passed to window.eval in a Partytown script runs in the window's scope, where page globals are defined.
0.15.0release notes