Update dependency jsdom to v29 by backstage-goalie[bot] · Pull Request #8821 · backstage/community-plugins

backstage-goalie · 2026-04-24T00:30:09Z

This PR contains the following updates:

Package	Change	Age	Confidence
jsdom	`^27` → `^29.0.0`
jsdom	`^27.0.0` → `^29.0.0`
jsdom	`^27.1.0` → `^29.0.0`

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Release Notes

jsdom/jsdom (jsdom)

`v29.1.1`

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Fixed 'border-radius' computed style serialization. (@asamuzaK)
Fixed computed style computation when using 'background-origin' and 'background-clip' CSS properties. (@asamuzaK)
Significantly optimized initial calls to getComputedStyle(), before the cache warms up. (@asamuzaK)

`v29.1.0`

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Added basic support for the ratio CSS type. (@asamuzaK)
Fixed getComputedStyle() sometimes returning outdated results after CSS was modified. (@asamuzaK)

`v29.0.2`

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Significantly improved and sped up getComputedStyle(). Computed value rules are now applied across a broader set of properties, and include fixes related to inheritance, defaulting keywords, custom properties, and color-related values such as currentcolor and system colors. (@asamuzaK)
Fixed CSS 'background' and 'border' shorthand parsing. (@asamuzaK)

`v29.0.1`

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Fixed CSS parsing of 'border', 'background', and their sub-shorthands containing keywords or var(). (@asamuzaK)
Fixed getComputedStyle() to return a more functional CSSStyleDeclaration object, including indexed access support, which regressed in v29.0.0.

`v29.0.0`

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Breaking changes:

Node.js v22.13.0+ is now the minimum supported v22 version (was v22.12.0+).

Other changes:

Overhauled the CSSOM implementation, replacing the @acemir/cssom and cssstyle dependencies with fresh internal implementations built on webidl2js wrappers and the css-tree parser. Serialization, parsing, and API behavior is improved in various ways, especially around edge cases.
Added CSSCounterStyleRule and CSSNamespaceRule to jsdom Windows.
Added cssMediaRule.matches and cssSupportsRule.matches getters.
Added proper media query parsing in MediaList, using css-tree instead of naive comma-splitting. Invalid queries become "not all" per spec.
Added cssKeyframeRule.keyText getter/setter validation.
Added cssStyleRule.selectorText setter validation: invalid selectors are now rejected.
Added styleSheet.ownerNode, styleSheet.href, and styleSheet.title.
Added bad port blocking per the fetch specification, preventing fetches to commonly-abused ports.
Improved Document initialization performance by lazily initializing the CSS selector engine, avoiding ~0.5 ms of overhead per Document. (@thypon)
Fixed a memory leak when stylesheets were removed from the document.
Fixed CSSStyleDeclaration modifications to properly trigger custom element reactions.
Fixed nested @media rule parsing.
Fixed CSSStyleSheet's "disallow modification" flag not being checked in all mutation methods.
Fixed XMLHttpRequest's response getter returning parsed JSON during the LOADING state instead of null.
Fixed getComputedStyle() crashing in XHTML documents when stylesheets contained at-rules such as @page or @font-face.
Fixed a potential hang in synchronous XMLHttpRequest caused by a race condition with the worker thread's idle timeout.

`v28.1.0`

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Added blob.text(), blob.arrayBuffer(), and blob.bytes() methods.
Improved getComputedStyle() to account for CSS specificity when multiple rules apply. (@asamuzaK)
Improved synchronous XMLHttpRequest performance by using a persistent worker thread, avoiding ~400ms of setup overhead on every synchronous request after the first one.
Improved performance of node.getRootNode(), node.isConnected, and event.dispatchEvent() by caching the root node of document-connected trees.
Fixed getComputedStyle() to correctly handle !important priority. (@asamuzaK)
Fixed document.getElementById() to return the first element in tree order when multiple elements share the same ID.
Fixed <svg> elements to no longer incorrectly proxy event handlers to the Window.
Fixed FileReader event timing and fileReader.result state to more closely follow the spec.
Fixed a potential hang when synchronous XMLHttpRequest encountered dispatch errors.
Fixed compatibility with environments where Node.js's built-in fetch() has been used before importing jsdom, by working around undici v6/v7 incompatibilities.

`v28.0.0`

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Overhauled resource loading customization. See the new README for details on the new API.
Added MIME type sniffing to <iframe> and <frame> loads.
Regression: WebSockets are no longer correctly throttled to one connection per origin. This is a result of the bug at nodejs/undici#4743.
Fixed decoding of the query components of <a> and <area> elements in non-UTF-8 documents.
Fixed XMLHttpRequest fetches and WebSocket upgrade requests to be interceptable by the new customizable resource loading. (Except synchronous XMLHttpRequests.)
Fixed the referrer of a document to be set correctly when redirects are involved; it is now the initiating page, not the last hop in the redirect chain.
Fixed correctness bugs when passing ArrayBuffers or typed arrays to various APIs, where they would not correctly snapshot the data.
Fixed require("url").parse() deprecation warning when using WebSockets.
Fixed <iframe>, <frame>, and <img> (when canvas is installed) to fire load events, not error events, on non-OK HTTP responses.
Fixed many small issues in XMLHttpRequest.

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