Bug 290336 – Extension storage.onChanged API missing second callback parameter in Safari for iOS

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: WebKit Extensions

As noted in https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage/onChanged, a web extension storage listener callback registered with e.g. browser.storage.onChanged.addListener((changes, areaName) => console.log({ changes, areaName })) should have an areaName parameter with the string 'local' when triggered by e.g. browser.storage.local.set; it does in Chromium and Firefox.

I am observing, however, that the parameter is undefined.

Tested in iOS 18.1.1 in a content script in a Manifest v3 extension loaded via xcrun safari-web-extension-converter. (The extension in question is https://github.com/AprilSylph/XKit-Rewritten, though I don't have a Safari framework committed to git/specific test code.)

[Radar WebKit Bug Importer]

<rdar://problem/147776365>

Example code: https://github.com/marcustyphoon/storage-extension-test/tree/main/src

This logs {changes: Object, areaName: "local"} in MacOS Safari 17.6 but {changes: Object, areaName: undefined} in Safari on iOS 18.1.1.

[Carlos J.]

Tested in iOS 18.3.1, and the areaName has been returned. Seems it has been fixed with https://github.com/WebKit/WebKit/pull/35493

Related bug: https://bugs.webkit.org/show_bug.cgi?id=281644

[Brent Fulgham]

*** This bug has been marked as a duplicate of bug 281644 ***

[Brent Fulgham]

@Carlos J. Thank you for confirming.